Manos M Tentzeris | Georgia Institute of Technology (original) (raw)

Papers by Manos M Tentzeris

2013 IEEE Wireless Power Transfer (WPT), 2013

ABSTRACT

2007 IEEE/MTT-S International Microwave Symposium, 2007

Concurrent Circuit-Level/System-Level Optimization of a 24 GHz ... Mixer for Automotive Applicati... more Concurrent Circuit-Level/System-Level Optimization of a 24 GHz ... Mixer for Automotive Applications Using a Hybrid ... Francesco Placentino', Daniela Staiculescu2, Symeon Nikolaou2, Lara Martin3, Andrea Scarponi', Federico Alimentil, Luca Rosellil, Manos M. Tentzeris2

IEEE Transactions on Microwave Theory and Techniques, 2000

This paper deals with a low-cost method for the assembly of flexible substrate antennas and UHF R... more This paper deals with a low-cost method for the assembly of flexible substrate antennas and UHF RF identification silicon (Si) chips. Such a method exploits a magnetic coupling mechanism, thus not requiring for galvanic contacts between the Si chip and antenna itself. The magnetic coupling is established by a planar transformer, the primary and secondary windings of which are implemented on flexible substrate and Si chip, respectively. As a result, the Si chip can be assembled on the antenna with a mere placing and gluing process. First, the idea has been validated by theory. Electromagnetic simulations of a square heterogeneous transformer (1.0-mm side) show a maximum available power gain (MAG) of 0.4 dB at 868 MHz. In addition, the heterogeneous transformer is also quite tolerant with respect to misalignment between primary and secondary. An offset error of 150 m reduces the MAG to 0.5 dB. A sub-optimal matching strategy, exploiting a simple on-chip capacitor, is then developed for antennas with 50input impedances. Finally, the idea has been experimentally validated exploiting printed circuit board (PCB) prototypes. A PCB transformer (1.5-mm side) and a transformer rectifier (two-diode Dickson multiplier) have been fabricated and tested. Measurements indicates a MAG of 0.3 dB at 868 MHz for the transformer and the capability of the developed rectifier to supply a 220-k load at 1.5 V with a 2-dBm input power.

2011 IEEE MTT-S International Microwave Symposium, 2011

This paper proposes an electrical model of carbonnanotube (CNT) networks, that can be patterned u... more This paper proposes an electrical model of carbonnanotube (CNT) networks, that can be patterned using inkjet transfer printing. The Double-Walled carbon Nanotubes (DWNTs) "inkjet"-able suspension was deposited in gaps of variable lengths cut out of the central line of the coplanar waveguide test structure. The proposed model was validated through measurements of the line input impedance and of the scattering parameters. The obtained results demonstrate that, by acting on the gap size and on the number of CNT ink layers, both the DC resistance and the resonance frequency of the test structure can be tuned (from tens of kΩ to tens of Ω and from few MHz to tens of MHz, respectively). Therefore, by exploiting the suggested equivalent circuit model, the CNT ink deposition process can be considered as a promising candidate for the design of microelectronic and microwave devices with tunable behavior (i.e., variable resistors, matching load networks, filters, and resonators).

The millimetre-wave passive temperature transducer consists of micro bimorph cantilevers (Au-Sili... more The millimetre-wave passive temperature transducer consists of micro bimorph cantilevers (Au-Silicon) and split ring resonators, operating around 30 GHz. The temperature change causes a deflection on the bimorph cantilevers, thus results in a shift of resonant frequencies of the split ring structure. The design achieves sensitivity of 2.62 GHz /um in terms of frequency shift response to cantilever deflection, corresponding to a sensitivity of 498 MHz / o C, three order of magnitude higher than existing sensors. In terms of deflection versus temperature, the material choices for the bimorph cantilevers can be varied and adapted to different applications including those operating in harsh environments. To demonstrate proof-of-concept, a scaled prototype operating around 3 GHz is presented with Radar Cross Section measurements for remote identification.

2007 IEEE Antennas and Propagation International Symposium, 2007

The implementation of a novel cactus-shaped monopole antenna that demonstrates an easily controll... more The implementation of a novel cactus-shaped monopole antenna that demonstrates an easily controllable return loss and omni-directional radiation patterns in frequency range from 2.9 GHz up to 12 GHz that exceeds the designated ultra wide band (UWB) range is discussed in this paper. The effect of the geometry characteristics on the return loss behavior is briefly explained. The proposed prototype antenna is fabricated on 225 µm thick Liquid Crystal Polymer (LCP) with overall board dimensions of 28 mm x 32mm.

IEEE Transactions on Microwave Theory and Techniques, 2004

Liquid crystal polymer (LCP) is a material that has gained attention as a potential high-performa... more Liquid crystal polymer (LCP) is a material that has gained attention as a potential high-performance microwave substrate and packaging material. This investigation uses several methods to determine the electrical properties of LCP for millimeter-wave frequencies. Microstrip ring resonators and cavity resonators are measured in order to characterize the dielectric constant ( ) and loss tangent (tan ) of LCP above 30 GHz. The measured dielectric constant is shown to be steady near 3.16, and the loss tangent stays below 0.0049. In addition, various transmission lines are fabricated on different LCP substrate thicknesses and the loss characteristics are given in decibels per centimeter from 2 to 110 GHz. Peak transmission-line losses at 110 GHz vary between 0.88-2.55 dB/cm, depending on the line type and geometry. These results show, for the first time, that LCP has excellent dielectric properties for applications extending through millimeter-wave frequencies.

IEEE Transactions on Antennas and Propagation, 2006

This paper presents the use of pin diodes to reconfigure the impedance match and modify the radia... more This paper presents the use of pin diodes to reconfigure the impedance match and modify the radiation pattern of an annular slot antenna (ASA). The planar antenna is fabricated on one side of a Duroid substrate and the microstrip feeding line with the matching network is fabricated on the opposite side of the board. The central frequency is 5.8 GHz and, by reconfiguring the matching circuit, the antenna was also designed to operate at 5.2 and 6.4 GHz. Pin diodes are also used to short the ASA in preselected positions along the circumference, thereby changing the direction of the null in the plane defined by the circular slot changes. As a proof of concept, two pin diodes are placed 45 on both sides of the feeding line along the ASA and the direction of the null is shown to align with the direction defined by the circular slot center and the diode. Consequently, a design that is reconfigurable in both frequency and radiation pattern is accomplished. Return loss and radiation pattern measurements and simulations are presented, which are in very good agreement.

esto.nasa.gov

... Figure 8. SEM of a fabricated air-bridge type CPW switch on LCP with 1.2µm thick Au membrane ... more ... Figure 8. SEM of a fabricated air-bridge type CPW switch on LCP with 1.2µm thick Au membrane and meander ... [7] R. Gonzalo, P. de. Maagt, and M. Sorolla, —Enhanced patch-antenna performance by suppressing surface waves using photonic-bandgap substrates,“ IEEE Trans. ...

IEEE Transactions on Antennas and Propagation, 2006

We discuss the use of a double exponentially tapered slot antenna (DETSA) fabricated on flexible ... more We discuss the use of a double exponentially tapered slot antenna (DETSA) fabricated on flexible liquid crystal polymer (LCP) as a candidate for ultrawideband (UWB) communications systems. The features of the antenna and the effect of the antenna on a transmitted pulse are investigated. Return loss and E and H plane radiation pattern measurements are presented in several frequencies covering the whole ultra wide band. The return loss remains below 10 dB and the shape of the radiation pattern remains fairly constant in the whole UWB range (3 110 6 GHz). The main lobe characteristic of the radiation pattern remains stable even when the antenna is significantly conformed. The major effect of the conformation is an increase in the cross polarization component amplitude. The system: transmitter DETSA-channel -receiver DETSA is measured in frequency domain and shows that the antenna adds very little distortion on a transmitted pulse. The distortion remains small even when both transmitter and receiver antennas are folded, although it increases slightly. Index Terms-Conformal antenna, distortion, double exponentially slot antenna (DETSA), liquid crystal polymer (LCP), ultrawideband (UWB), ultrashort pulse.

Antennas and Wireless Propagation Letters, 2005

The development of dual-frequency (14 and 35 GHz), dual-polarization microstrip antenna arrays is... more The development of dual-frequency (14 and 35 GHz), dual-polarization microstrip antenna arrays is presented for the first time on liquid crystal polymer (LCP) multilayer technology. Some of the properties of LCP, such as multilayer (three-dimensional) vertical integration capability, good electrical and mechanical properties, and near-hermetic nature, make this substrate a practical choice for the design of low-cost antenna arrays that can be integrated with remote sensing applications operating in the Ku and millimeter-wave frequency bands. This work illustrates the potential of LCP as a low-cost, "all-package" solution for developing compact, flexible, antenna arrays that can be used in future communication and remote sensing systems.

This paper discusses the use of pin diodes to modify the radiation pattern of an Annular Slot Ant... more This paper discusses the use of pin diodes to modify the radiation pattern of an Annular Slot Antenna (ASA) keeping constant the frequency of operation. The planar antenna is fabricated on the top side of a Duroid substrate and the microstrip feeding line with the matching network is fabricated on the back side of the board. The design frequency is 5.8 GHz. Pin diodes are used to short the ASA in pre-selected positions along the circumference. As a result of the short, the direction of the null in the plane defined by the circular slot changes. As a proof of concept two pin diodes are placed symmetrically to the feeding line and 45 degrees away from the feeding line direction. As a result, the direction of the null shifts and is aligned with the direction defined by the circular slot center and the diode. Consequently a reconfigurable radiation pattern is accomplished. Return loss and radiation pattern measurements and simulations are presented and demonstrate a very good agreement.

2007 IEEE Antennas and Propagation International Symposium, 2007

The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their eas... more The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their ease of fabrication, wide bandwidth, and high gain make them desirable for military and commercial systems. Fabrication on thin, flexible substrates allows the TSA to be conformed over a given body, such as an aircraft wing or a piece of clothing for wearable networks. Previously, a double exponentially tapered slot antenna (DETSA) was conformed around an exponential curvature, which showed that the main beam skewed towards the direction of curvature. This paper presents a linearly tapered slot antenna (LTSA) conformed longitudinally around a cylinder. Measured and simulated radiation patterns and the direction of maximum H co-polarization (Hco) as a function of the cylinder radius are presented.

Antennas and Wireless Propagation Letters, 2000

A novel Ka-band surface micromachined air-elevated patch antenna is designed, fabricated and char... more A novel Ka-band surface micromachined air-elevated patch antenna is designed, fabricated and characterized. It demonstrates a 10.5% 10-dB fractional bandwidth and 9.5 dBi directivity for an elevation of 600 µm. The elevated patch is fed by a vertical epoxy-core metal-coated micromachined probe and supported by several epoxy posts underneath. By the unique feeding technique and the substrate removal approach that are presented in this paper, the performance degradation for traditional microstrip antenna directly built on high-ε r substrate can be significantly alleviated.

esto.gsfc.nasa.gov

Abstract-This paper presents the most recent results towards the development of a lightweight dua... more Abstract-This paper presents the most recent results towards the development of a lightweight dual frequency/polarization microstrip antenna array on Liquid Crystal Polymer (LCP) substrates for NASA's remote sensing applications. LCP's multi-layer lamination capabilities, ...

Antennas and Propagation Society International Symposium, 2009

This paper reports on novel mm-wave passive components; namely vertical broadband transitions, a ... more This paper reports on novel mm-wave passive components; namely vertical broadband transitions, a high efficiency aperture coupled microstrip antenna array, and their integration on flexible and organic Liquid Crystal Polymer (LCP) to realize a simple, low cost, passive front end module using a system on package (SOP) concept. Coplanar Waveguide-Coplanar Waveguide-Microstrip (CPW-CPW-MSTRIP) and CPW-CPW-CPW 3D transition designs using strategically placed vias and tapering of the CPW ground planes, which suppress radiation loss and optimize the performance over a very broad frequency range are presented. A four-element aperture coupled microstrip antenna array with a high efficiency of 82% and a gain of 12dBi at 77GHz is reported. These structures are simple to realize and are compatible with low-cost substrate fabrication guidelines, thereby allowing for the easy feeding of embedded IC's in 3D modules, especially in compact automotive radar applications and beam-steering wideband antenna arrays. Measurement results are provided for the 3D transitions to show the proof of concept for the front end passive system.

The design and optimization of compact antennas on multilayer technology for SOP applications is ... more The design and optimization of compact antennas on multilayer technology for SOP applications is presented. First, the development of dual-frequency, dual-polarization microstrip antenna arrays is presented for remote sensing applications at 14 and 35 GHz. Then, a double fed crossshaped microstrip antenna has been designed for the purpose of doubling the data throughput by means of a dual-polarized wireless channel, covering the band between 59-64 GHz. This antenna can be easily integrated into a wireless millimeterwave link system. Furthermore, a double exponentially tapered slot antenna (DETSA) is introduced for integration with other components in the ultra wideband (UWB) frequency range. Finally, a multi-band planar wire antenna is introduced for wireless communications and WLAN applications. In this design, three distinct bands can be covered with a single compact structure.

2013 IEEE Wireless Power Transfer (WPT), 2013

ABSTRACT

2007 IEEE/MTT-S International Microwave Symposium, 2007

Concurrent Circuit-Level/System-Level Optimization of a 24 GHz ... Mixer for Automotive Applicati... more Concurrent Circuit-Level/System-Level Optimization of a 24 GHz ... Mixer for Automotive Applications Using a Hybrid ... Francesco Placentino', Daniela Staiculescu2, Symeon Nikolaou2, Lara Martin3, Andrea Scarponi', Federico Alimentil, Luca Rosellil, Manos M. Tentzeris2

IEEE Transactions on Microwave Theory and Techniques, 2000

This paper deals with a low-cost method for the assembly of flexible substrate antennas and UHF R... more This paper deals with a low-cost method for the assembly of flexible substrate antennas and UHF RF identification silicon (Si) chips. Such a method exploits a magnetic coupling mechanism, thus not requiring for galvanic contacts between the Si chip and antenna itself. The magnetic coupling is established by a planar transformer, the primary and secondary windings of which are implemented on flexible substrate and Si chip, respectively. As a result, the Si chip can be assembled on the antenna with a mere placing and gluing process. First, the idea has been validated by theory. Electromagnetic simulations of a square heterogeneous transformer (1.0-mm side) show a maximum available power gain (MAG) of 0.4 dB at 868 MHz. In addition, the heterogeneous transformer is also quite tolerant with respect to misalignment between primary and secondary. An offset error of 150 m reduces the MAG to 0.5 dB. A sub-optimal matching strategy, exploiting a simple on-chip capacitor, is then developed for antennas with 50input impedances. Finally, the idea has been experimentally validated exploiting printed circuit board (PCB) prototypes. A PCB transformer (1.5-mm side) and a transformer rectifier (two-diode Dickson multiplier) have been fabricated and tested. Measurements indicates a MAG of 0.3 dB at 868 MHz for the transformer and the capability of the developed rectifier to supply a 220-k load at 1.5 V with a 2-dBm input power.

2011 IEEE MTT-S International Microwave Symposium, 2011

This paper proposes an electrical model of carbonnanotube (CNT) networks, that can be patterned u... more This paper proposes an electrical model of carbonnanotube (CNT) networks, that can be patterned using inkjet transfer printing. The Double-Walled carbon Nanotubes (DWNTs) "inkjet"-able suspension was deposited in gaps of variable lengths cut out of the central line of the coplanar waveguide test structure. The proposed model was validated through measurements of the line input impedance and of the scattering parameters. The obtained results demonstrate that, by acting on the gap size and on the number of CNT ink layers, both the DC resistance and the resonance frequency of the test structure can be tuned (from tens of kΩ to tens of Ω and from few MHz to tens of MHz, respectively). Therefore, by exploiting the suggested equivalent circuit model, the CNT ink deposition process can be considered as a promising candidate for the design of microelectronic and microwave devices with tunable behavior (i.e., variable resistors, matching load networks, filters, and resonators).

The millimetre-wave passive temperature transducer consists of micro bimorph cantilevers (Au-Sili... more The millimetre-wave passive temperature transducer consists of micro bimorph cantilevers (Au-Silicon) and split ring resonators, operating around 30 GHz. The temperature change causes a deflection on the bimorph cantilevers, thus results in a shift of resonant frequencies of the split ring structure. The design achieves sensitivity of 2.62 GHz /um in terms of frequency shift response to cantilever deflection, corresponding to a sensitivity of 498 MHz / o C, three order of magnitude higher than existing sensors. In terms of deflection versus temperature, the material choices for the bimorph cantilevers can be varied and adapted to different applications including those operating in harsh environments. To demonstrate proof-of-concept, a scaled prototype operating around 3 GHz is presented with Radar Cross Section measurements for remote identification.

2007 IEEE Antennas and Propagation International Symposium, 2007

The implementation of a novel cactus-shaped monopole antenna that demonstrates an easily controll... more The implementation of a novel cactus-shaped monopole antenna that demonstrates an easily controllable return loss and omni-directional radiation patterns in frequency range from 2.9 GHz up to 12 GHz that exceeds the designated ultra wide band (UWB) range is discussed in this paper. The effect of the geometry characteristics on the return loss behavior is briefly explained. The proposed prototype antenna is fabricated on 225 µm thick Liquid Crystal Polymer (LCP) with overall board dimensions of 28 mm x 32mm.

IEEE Transactions on Microwave Theory and Techniques, 2004

Liquid crystal polymer (LCP) is a material that has gained attention as a potential high-performa... more Liquid crystal polymer (LCP) is a material that has gained attention as a potential high-performance microwave substrate and packaging material. This investigation uses several methods to determine the electrical properties of LCP for millimeter-wave frequencies. Microstrip ring resonators and cavity resonators are measured in order to characterize the dielectric constant ( ) and loss tangent (tan ) of LCP above 30 GHz. The measured dielectric constant is shown to be steady near 3.16, and the loss tangent stays below 0.0049. In addition, various transmission lines are fabricated on different LCP substrate thicknesses and the loss characteristics are given in decibels per centimeter from 2 to 110 GHz. Peak transmission-line losses at 110 GHz vary between 0.88-2.55 dB/cm, depending on the line type and geometry. These results show, for the first time, that LCP has excellent dielectric properties for applications extending through millimeter-wave frequencies.

IEEE Transactions on Antennas and Propagation, 2006

This paper presents the use of pin diodes to reconfigure the impedance match and modify the radia... more This paper presents the use of pin diodes to reconfigure the impedance match and modify the radiation pattern of an annular slot antenna (ASA). The planar antenna is fabricated on one side of a Duroid substrate and the microstrip feeding line with the matching network is fabricated on the opposite side of the board. The central frequency is 5.8 GHz and, by reconfiguring the matching circuit, the antenna was also designed to operate at 5.2 and 6.4 GHz. Pin diodes are also used to short the ASA in preselected positions along the circumference, thereby changing the direction of the null in the plane defined by the circular slot changes. As a proof of concept, two pin diodes are placed 45 on both sides of the feeding line along the ASA and the direction of the null is shown to align with the direction defined by the circular slot center and the diode. Consequently, a design that is reconfigurable in both frequency and radiation pattern is accomplished. Return loss and radiation pattern measurements and simulations are presented, which are in very good agreement.

esto.nasa.gov

... Figure 8. SEM of a fabricated air-bridge type CPW switch on LCP with 1.2µm thick Au membrane ... more ... Figure 8. SEM of a fabricated air-bridge type CPW switch on LCP with 1.2µm thick Au membrane and meander ... [7] R. Gonzalo, P. de. Maagt, and M. Sorolla, —Enhanced patch-antenna performance by suppressing surface waves using photonic-bandgap substrates,“ IEEE Trans. ...

IEEE Transactions on Antennas and Propagation, 2006

We discuss the use of a double exponentially tapered slot antenna (DETSA) fabricated on flexible ... more We discuss the use of a double exponentially tapered slot antenna (DETSA) fabricated on flexible liquid crystal polymer (LCP) as a candidate for ultrawideband (UWB) communications systems. The features of the antenna and the effect of the antenna on a transmitted pulse are investigated. Return loss and E and H plane radiation pattern measurements are presented in several frequencies covering the whole ultra wide band. The return loss remains below 10 dB and the shape of the radiation pattern remains fairly constant in the whole UWB range (3 110 6 GHz). The main lobe characteristic of the radiation pattern remains stable even when the antenna is significantly conformed. The major effect of the conformation is an increase in the cross polarization component amplitude. The system: transmitter DETSA-channel -receiver DETSA is measured in frequency domain and shows that the antenna adds very little distortion on a transmitted pulse. The distortion remains small even when both transmitter and receiver antennas are folded, although it increases slightly. Index Terms-Conformal antenna, distortion, double exponentially slot antenna (DETSA), liquid crystal polymer (LCP), ultrawideband (UWB), ultrashort pulse.

Antennas and Wireless Propagation Letters, 2005

The development of dual-frequency (14 and 35 GHz), dual-polarization microstrip antenna arrays is... more The development of dual-frequency (14 and 35 GHz), dual-polarization microstrip antenna arrays is presented for the first time on liquid crystal polymer (LCP) multilayer technology. Some of the properties of LCP, such as multilayer (three-dimensional) vertical integration capability, good electrical and mechanical properties, and near-hermetic nature, make this substrate a practical choice for the design of low-cost antenna arrays that can be integrated with remote sensing applications operating in the Ku and millimeter-wave frequency bands. This work illustrates the potential of LCP as a low-cost, "all-package" solution for developing compact, flexible, antenna arrays that can be used in future communication and remote sensing systems.

This paper discusses the use of pin diodes to modify the radiation pattern of an Annular Slot Ant... more This paper discusses the use of pin diodes to modify the radiation pattern of an Annular Slot Antenna (ASA) keeping constant the frequency of operation. The planar antenna is fabricated on the top side of a Duroid substrate and the microstrip feeding line with the matching network is fabricated on the back side of the board. The design frequency is 5.8 GHz. Pin diodes are used to short the ASA in pre-selected positions along the circumference. As a result of the short, the direction of the null in the plane defined by the circular slot changes. As a proof of concept two pin diodes are placed symmetrically to the feeding line and 45 degrees away from the feeding line direction. As a result, the direction of the null shifts and is aligned with the direction defined by the circular slot center and the diode. Consequently a reconfigurable radiation pattern is accomplished. Return loss and radiation pattern measurements and simulations are presented and demonstrate a very good agreement.

2007 IEEE Antennas and Propagation International Symposium, 2007

The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their eas... more The family of tapered slot antennas (TSA's) is suitable for numerous applications. Their ease of fabrication, wide bandwidth, and high gain make them desirable for military and commercial systems. Fabrication on thin, flexible substrates allows the TSA to be conformed over a given body, such as an aircraft wing or a piece of clothing for wearable networks. Previously, a double exponentially tapered slot antenna (DETSA) was conformed around an exponential curvature, which showed that the main beam skewed towards the direction of curvature. This paper presents a linearly tapered slot antenna (LTSA) conformed longitudinally around a cylinder. Measured and simulated radiation patterns and the direction of maximum H co-polarization (Hco) as a function of the cylinder radius are presented.

Antennas and Wireless Propagation Letters, 2000

A novel Ka-band surface micromachined air-elevated patch antenna is designed, fabricated and char... more A novel Ka-band surface micromachined air-elevated patch antenna is designed, fabricated and characterized. It demonstrates a 10.5% 10-dB fractional bandwidth and 9.5 dBi directivity for an elevation of 600 µm. The elevated patch is fed by a vertical epoxy-core metal-coated micromachined probe and supported by several epoxy posts underneath. By the unique feeding technique and the substrate removal approach that are presented in this paper, the performance degradation for traditional microstrip antenna directly built on high-ε r substrate can be significantly alleviated.

esto.gsfc.nasa.gov

Abstract-This paper presents the most recent results towards the development of a lightweight dua... more Abstract-This paper presents the most recent results towards the development of a lightweight dual frequency/polarization microstrip antenna array on Liquid Crystal Polymer (LCP) substrates for NASA's remote sensing applications. LCP's multi-layer lamination capabilities, ...

Antennas and Propagation Society International Symposium, 2009

This paper reports on novel mm-wave passive components; namely vertical broadband transitions, a ... more This paper reports on novel mm-wave passive components; namely vertical broadband transitions, a high efficiency aperture coupled microstrip antenna array, and their integration on flexible and organic Liquid Crystal Polymer (LCP) to realize a simple, low cost, passive front end module using a system on package (SOP) concept. Coplanar Waveguide-Coplanar Waveguide-Microstrip (CPW-CPW-MSTRIP) and CPW-CPW-CPW 3D transition designs using strategically placed vias and tapering of the CPW ground planes, which suppress radiation loss and optimize the performance over a very broad frequency range are presented. A four-element aperture coupled microstrip antenna array with a high efficiency of 82% and a gain of 12dBi at 77GHz is reported. These structures are simple to realize and are compatible with low-cost substrate fabrication guidelines, thereby allowing for the easy feeding of embedded IC's in 3D modules, especially in compact automotive radar applications and beam-steering wideband antenna arrays. Measurement results are provided for the 3D transitions to show the proof of concept for the front end passive system.

The design and optimization of compact antennas on multilayer technology for SOP applications is ... more The design and optimization of compact antennas on multilayer technology for SOP applications is presented. First, the development of dual-frequency, dual-polarization microstrip antenna arrays is presented for remote sensing applications at 14 and 35 GHz. Then, a double fed crossshaped microstrip antenna has been designed for the purpose of doubling the data throughput by means of a dual-polarized wireless channel, covering the band between 59-64 GHz. This antenna can be easily integrated into a wireless millimeterwave link system. Furthermore, a double exponentially tapered slot antenna (DETSA) is introduced for integration with other components in the ultra wideband (UWB) frequency range. Finally, a multi-band planar wire antenna is introduced for wireless communications and WLAN applications. In this design, three distinct bands can be covered with a single compact structure.