Gert Poesen - Academia.edu (original) (raw)

Papers by Gert Poesen

Research paper thumbnail of Opto Controlled RF Attenuator on High Resistivity Silicon

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2005

Research paper thumbnail of Opto Controlled RF Attenuator on High Resistivity Silicon

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2005

Research paper thumbnail of Optical modulation of CPW lines on high-resistive BCB coated silicon substrates up to 110 GHz

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2004

Research paper thumbnail of Optical modulation of CPW lines on high-resistive BCB coated silicon substrates up to 110 GHz

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2004

Research paper thumbnail of Heuristic approach of Finite Grounded Frequency Selective Surface Arrays characterization in W-band

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Dec 27, 2008

We present the design, processing and testing of W-band finite Grounded Frequency Selective Surfa... more We present the design, processing and testing of W-band finite Grounded Frequency Selective Surface (FSS). With commercial software CADs, infinite arrays can only be simulated but for FSS design there is a need for design of finite arrays. As the simulations couldn’t provide direct insight into the relevant physics, we heuristically investigated designs with intermediate complexity: from infinite array towards the finite arrays, finding out the effects of finiteness and effects of array elements on the results. We fabricated the corresponding FSS arrays on quartz substrate with etching techniques, and characterized the vector S-parameters with a free space MVNA. Introduction Frequency Selective Surfaces (FSS) are predominantly passive electromagnetic filters formed by thin conducting elements on a dielectric substrate or periodic aperture elements in a conducting sheet [1]. Typically the analyses of FSS and other planar periodic structures are carried out under the assumption that they are infinite in extent, even though the dimensions of practical FSS structures are necessarily finite. A number of methods, e.g., mode matching, the moment method [2]-[6], the spectral-Galerkin approach [7], and certain approximate methods, are available for analyzing infinite periodic structures. All of these methods are based on a Floquet-type representation of the fields in a unit cell, whose dimensions are typically on the order of a wavelength. However, none of these techniques allow convenient extension to the more practical geometry, which comprises a large, but finite, number of array cells. Except under the approximation that edge effects are negligible, the analysis of the finite structure cannot be simplified by invoking periodicity, and it becomes necessary to work with a large number of unknowns, often on the order of a few thousand, in order to derive an accurate solution to the finite FSS problem [8]. Matrix methods are clearly not suited for handling such problems owing to the fact that they require prohibitively large storage on the computer. The design and development of finite antenna array is complex and costly. To reduce design costs and design risks, and to improve the performance of the arrays, simulations should meet a number of criteria: they should be fast executable, they should show boundary effects and effects of mutual coupling, and they should determine the antenna performance parameters accurately [9]. Simulations based on the generally applied infinite-array approach and simulations based on the finite-element method do not satisfy these criteria. Simulations of the first type do not describe boundary effects, while simulations of the second type are computationally too expensive. Both types of simulations do not provide direct insight into the physics relevant to the designs. Analysis of FSS is very crucial for both design and application engineers. However, Computer Aided Design (CADs) can only deal with antenna arrays with infinitely periodic boundary conditions. Hence there is a need for the development of a heuristic Proceedings Symposium IEEE/LEOS Benelux Chapter, 2008, Twente

Research paper thumbnail of Heuristic approach of Finite Grounded Frequency Selective Surface Arrays characterization in W-band

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Dec 27, 2008

We present the design, processing and testing of W-band finite Grounded Frequency Selective Surfa... more We present the design, processing and testing of W-band finite Grounded Frequency Selective Surface (FSS). With commercial software CADs, infinite arrays can only be simulated but for FSS design there is a need for design of finite arrays. As the simulations couldn’t provide direct insight into the relevant physics, we heuristically investigated designs with intermediate complexity: from infinite array towards the finite arrays, finding out the effects of finiteness and effects of array elements on the results. We fabricated the corresponding FSS arrays on quartz substrate with etching techniques, and characterized the vector S-parameters with a free space MVNA. Introduction Frequency Selective Surfaces (FSS) are predominantly passive electromagnetic filters formed by thin conducting elements on a dielectric substrate or periodic aperture elements in a conducting sheet [1]. Typically the analyses of FSS and other planar periodic structures are carried out under the assumption that they are infinite in extent, even though the dimensions of practical FSS structures are necessarily finite. A number of methods, e.g., mode matching, the moment method [2]-[6], the spectral-Galerkin approach [7], and certain approximate methods, are available for analyzing infinite periodic structures. All of these methods are based on a Floquet-type representation of the fields in a unit cell, whose dimensions are typically on the order of a wavelength. However, none of these techniques allow convenient extension to the more practical geometry, which comprises a large, but finite, number of array cells. Except under the approximation that edge effects are negligible, the analysis of the finite structure cannot be simplified by invoking periodicity, and it becomes necessary to work with a large number of unknowns, often on the order of a few thousand, in order to derive an accurate solution to the finite FSS problem [8]. Matrix methods are clearly not suited for handling such problems owing to the fact that they require prohibitively large storage on the computer. The design and development of finite antenna array is complex and costly. To reduce design costs and design risks, and to improve the performance of the arrays, simulations should meet a number of criteria: they should be fast executable, they should show boundary effects and effects of mutual coupling, and they should determine the antenna performance parameters accurately [9]. Simulations based on the generally applied infinite-array approach and simulations based on the finite-element method do not satisfy these criteria. Simulations of the first type do not describe boundary effects, while simulations of the second type are computationally too expensive. Both types of simulations do not provide direct insight into the physics relevant to the designs. Analysis of FSS is very crucial for both design and application engineers. However, Computer Aided Design (CADs) can only deal with antenna arrays with infinitely periodic boundary conditions. Hence there is a need for the development of a heuristic Proceedings Symposium IEEE/LEOS Benelux Chapter, 2008, Twente

Research paper thumbnail of Dielectric Analysis of 3D Printed Materials for Focusing Elements Operating in Mm & THz Wave Frequency Bands

Research paper thumbnail of Imaging in the millimeter wave domain: challenges and pitfalls

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2005

Research paper thumbnail of Frequency Selective Surface as a filter for mm-wave imaging

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2007

Research paper thumbnail of Microwave Characterization of optical modulated Photo-induced switches with a passivation layer using an LSNA

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Dec 9, 2008

Research paper thumbnail of Modeling photo-induced plasmas in planar transmission lines for switching millimeter-wave signals

MWP 2003 Proceedings. International Topical Meeting on Microwave Photonics, 2003.

Research paper thumbnail of Microwave characterization of optically modulated photo-induced switches with a passivation layer using an LSNA

2008 72nd ARFTG Microwave Measurement Symposium, 2008

A measurement set-up has been developed to characterize the electrical response to a pulsed optic... more A measurement set-up has been developed to characterize the electrical response to a pulsed optical excitation on photo-induced switches. The hardware configuration is a combination of a 50 GHz LSNA and a laser modulated by a pulse generator. By making use of vector large-signal measurements, the pulse envelope response is measured which allows the study of transient effects as well

Research paper thumbnail of Contactless monitoring of Si substrate permittivity and resistivity from microwave to millimeter wave frequencies

Microwave and Optical Technology Letters, 2010

A contactless and nondestructive technique is employed for characterizing single-sided metallised... more A contactless and nondestructive technique is employed for characterizing single-sided metallised silicon wafers. The reflection spectra are measured using a quasi-optical millmeter-wave setup in the frequency range 40-320 GHz. The results are compared with those provided by the coplanar waveguide method, in terms of accuracy and range of applicability.

Research paper thumbnail of Ar Implantation, a Passivation Technique for High-Resistivity Silicon within the MCM-D Technology

2006 European Microwave Integrated Circuits Conference, 2006

High-resistivity silicon (HRSi) has excellent properties as substrate material to integrate micro... more High-resistivity silicon (HRSi) has excellent properties as substrate material to integrate microwave passive components and system in a package (SiP) modules. However, the existence of a layer of free surface charges under the silicon-silicon dioxide interface generated by impurities in the SiO2 and in the interface itself undermines the RF properties of the bulk HRSi. This paper demonstrates that the

Research paper thumbnail of Opto controlled substrate losses in a coplanar waveguide on HR-Si

IEEE MTT-S International Microwave Symposium Digest, 2005.

The development of opto-electronic RF switch for millimeter wave applications designed in a multi... more The development of opto-electronic RF switch for millimeter wave applications designed in a multilayer thin-film multichip module technology on HR-Si is discussed in this paper. Insertion loss measurements of a CPW line under illumination demonstrate a contrast of about 40 dB at 100GHz. For the interaction between RF-signal and the photo-induced conductivity, different models have been developed. A D model is used in EM-solvers to predict and study the impact of the photoconductivity modulation. A lumped model is developed as well to make the integration into circuit simulators.

Research paper thumbnail of <title>Optoelectronic control of coplanar transmission lines up to 110 GHz</title>

Microwave and Terahertz Photonics, 2004

ABSTRACT

Research paper thumbnail of Models for opto-electronic controlled coplanar waveguides on high resistive BCB coated Si substrates technology up to 110 GHz

Research paper thumbnail of Transient Effects in Optically Modulated Transmission Line Switches

2006 International Topical Meeting on Microwave Photonics, 2006

Transient effects of optically modulated RF-switches, measured with a large-signal vector network... more Transient effects of optically modulated RF-switches, measured with a large-signal vector network analyzer (LSNA) are discussed in this paper. Light is used to influence the characteristics of a coplanar waveguide (CPW) designed in a multilayer thin-film multichip module (MCM-D) technology on high resistivity silicon (HR-Si). Under static illumination of the CPW line, measurements demonstrate an insertion loss contrast of more

Research paper thumbnail of Simulation and Experimental Verification of W-Band Finite Frequency Selective Surfaces on Infinite Background with 3D Full Wave Solver Nspwmlfma

Progress In Electromagnetics Research, 2010

We present the design, processing and testing of a W-band finite by infinite and a finite by fini... more We present the design, processing and testing of a W-band finite by infinite and a finite by finite Grounded Frequency Selective Surfaces (FSSs) on infinite background. The 3D full wave solver Nondirective Stable Plane Wave Multilevel Fast Multipole Algorithm (NSPWMLFMA) is used to simulate the FSSs. As NSPWMLFMA solver improves the complexity matrix-vector product in an iterative solver from O(N 2) to O(N log N) which enables the solver to simulate finite arrays with faster execution time and manageable memory requirements. The simulation results were verified by comparing them with the experimental results. The comparisons demonstrate the accuracy of the NSPWMLFMA solver. We fabricated the corresponding FSS arrays on quartz substrate with photolithographic etching techniques and characterized the vector S-parameters with a free space Millimeter Wave Vector Network Analyzer (MVNA).

Research paper thumbnail of Effect of inter-element spacings variation on the performance of linear grounded frequency selective surface arrays in W-band

Microwave and Optical Technology Letters, 2010

This article examines the issue of extending the inter-element spacing between slots of equally-s... more This article examines the issue of extending the inter-element spacing between slots of equally-spaced linear grounded frequency selective surface (FSS) arrays with spacing beyond half a wavelength in W-band (75-110 GHz). We present the design, processing, and testing of W-band grounded FSS arrays with different inter-element spacings along transverse electric (TE) and transverse magnetic (TM) field directions separately. The comparison of periodicity changing effects along TE and TM field directions has been reported. The inter-element spacing versus phase curves demonstrate that in some extent the inter-element spacing can be a phase optimization parameter for complex array design. We fabricated the corresponding FSS arrays on quartz substrate with photolithographic etching technique, and characterized the vector S-parameters with a free space MVNA.

Research paper thumbnail of Opto Controlled RF Attenuator on High Resistivity Silicon

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2005

Research paper thumbnail of Opto Controlled RF Attenuator on High Resistivity Silicon

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2005

Research paper thumbnail of Optical modulation of CPW lines on high-resistive BCB coated silicon substrates up to 110 GHz

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2004

Research paper thumbnail of Optical modulation of CPW lines on high-resistive BCB coated silicon substrates up to 110 GHz

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2004

Research paper thumbnail of Heuristic approach of Finite Grounded Frequency Selective Surface Arrays characterization in W-band

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Dec 27, 2008

We present the design, processing and testing of W-band finite Grounded Frequency Selective Surfa... more We present the design, processing and testing of W-band finite Grounded Frequency Selective Surface (FSS). With commercial software CADs, infinite arrays can only be simulated but for FSS design there is a need for design of finite arrays. As the simulations couldn’t provide direct insight into the relevant physics, we heuristically investigated designs with intermediate complexity: from infinite array towards the finite arrays, finding out the effects of finiteness and effects of array elements on the results. We fabricated the corresponding FSS arrays on quartz substrate with etching techniques, and characterized the vector S-parameters with a free space MVNA. Introduction Frequency Selective Surfaces (FSS) are predominantly passive electromagnetic filters formed by thin conducting elements on a dielectric substrate or periodic aperture elements in a conducting sheet [1]. Typically the analyses of FSS and other planar periodic structures are carried out under the assumption that they are infinite in extent, even though the dimensions of practical FSS structures are necessarily finite. A number of methods, e.g., mode matching, the moment method [2]-[6], the spectral-Galerkin approach [7], and certain approximate methods, are available for analyzing infinite periodic structures. All of these methods are based on a Floquet-type representation of the fields in a unit cell, whose dimensions are typically on the order of a wavelength. However, none of these techniques allow convenient extension to the more practical geometry, which comprises a large, but finite, number of array cells. Except under the approximation that edge effects are negligible, the analysis of the finite structure cannot be simplified by invoking periodicity, and it becomes necessary to work with a large number of unknowns, often on the order of a few thousand, in order to derive an accurate solution to the finite FSS problem [8]. Matrix methods are clearly not suited for handling such problems owing to the fact that they require prohibitively large storage on the computer. The design and development of finite antenna array is complex and costly. To reduce design costs and design risks, and to improve the performance of the arrays, simulations should meet a number of criteria: they should be fast executable, they should show boundary effects and effects of mutual coupling, and they should determine the antenna performance parameters accurately [9]. Simulations based on the generally applied infinite-array approach and simulations based on the finite-element method do not satisfy these criteria. Simulations of the first type do not describe boundary effects, while simulations of the second type are computationally too expensive. Both types of simulations do not provide direct insight into the physics relevant to the designs. Analysis of FSS is very crucial for both design and application engineers. However, Computer Aided Design (CADs) can only deal with antenna arrays with infinitely periodic boundary conditions. Hence there is a need for the development of a heuristic Proceedings Symposium IEEE/LEOS Benelux Chapter, 2008, Twente

Research paper thumbnail of Heuristic approach of Finite Grounded Frequency Selective Surface Arrays characterization in W-band

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Dec 27, 2008

We present the design, processing and testing of W-band finite Grounded Frequency Selective Surfa... more We present the design, processing and testing of W-band finite Grounded Frequency Selective Surface (FSS). With commercial software CADs, infinite arrays can only be simulated but for FSS design there is a need for design of finite arrays. As the simulations couldn’t provide direct insight into the relevant physics, we heuristically investigated designs with intermediate complexity: from infinite array towards the finite arrays, finding out the effects of finiteness and effects of array elements on the results. We fabricated the corresponding FSS arrays on quartz substrate with etching techniques, and characterized the vector S-parameters with a free space MVNA. Introduction Frequency Selective Surfaces (FSS) are predominantly passive electromagnetic filters formed by thin conducting elements on a dielectric substrate or periodic aperture elements in a conducting sheet [1]. Typically the analyses of FSS and other planar periodic structures are carried out under the assumption that they are infinite in extent, even though the dimensions of practical FSS structures are necessarily finite. A number of methods, e.g., mode matching, the moment method [2]-[6], the spectral-Galerkin approach [7], and certain approximate methods, are available for analyzing infinite periodic structures. All of these methods are based on a Floquet-type representation of the fields in a unit cell, whose dimensions are typically on the order of a wavelength. However, none of these techniques allow convenient extension to the more practical geometry, which comprises a large, but finite, number of array cells. Except under the approximation that edge effects are negligible, the analysis of the finite structure cannot be simplified by invoking periodicity, and it becomes necessary to work with a large number of unknowns, often on the order of a few thousand, in order to derive an accurate solution to the finite FSS problem [8]. Matrix methods are clearly not suited for handling such problems owing to the fact that they require prohibitively large storage on the computer. The design and development of finite antenna array is complex and costly. To reduce design costs and design risks, and to improve the performance of the arrays, simulations should meet a number of criteria: they should be fast executable, they should show boundary effects and effects of mutual coupling, and they should determine the antenna performance parameters accurately [9]. Simulations based on the generally applied infinite-array approach and simulations based on the finite-element method do not satisfy these criteria. Simulations of the first type do not describe boundary effects, while simulations of the second type are computationally too expensive. Both types of simulations do not provide direct insight into the physics relevant to the designs. Analysis of FSS is very crucial for both design and application engineers. However, Computer Aided Design (CADs) can only deal with antenna arrays with infinitely periodic boundary conditions. Hence there is a need for the development of a heuristic Proceedings Symposium IEEE/LEOS Benelux Chapter, 2008, Twente

Research paper thumbnail of Dielectric Analysis of 3D Printed Materials for Focusing Elements Operating in Mm & THz Wave Frequency Bands

Research paper thumbnail of Imaging in the millimeter wave domain: challenges and pitfalls

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2005

Research paper thumbnail of Frequency Selective Surface as a filter for mm-wave imaging

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, 2007

Research paper thumbnail of Microwave Characterization of optical modulated Photo-induced switches with a passivation layer using an LSNA

Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet, Dec 9, 2008

Research paper thumbnail of Modeling photo-induced plasmas in planar transmission lines for switching millimeter-wave signals

MWP 2003 Proceedings. International Topical Meeting on Microwave Photonics, 2003.

Research paper thumbnail of Microwave characterization of optically modulated photo-induced switches with a passivation layer using an LSNA

2008 72nd ARFTG Microwave Measurement Symposium, 2008

A measurement set-up has been developed to characterize the electrical response to a pulsed optic... more A measurement set-up has been developed to characterize the electrical response to a pulsed optical excitation on photo-induced switches. The hardware configuration is a combination of a 50 GHz LSNA and a laser modulated by a pulse generator. By making use of vector large-signal measurements, the pulse envelope response is measured which allows the study of transient effects as well

Research paper thumbnail of Contactless monitoring of Si substrate permittivity and resistivity from microwave to millimeter wave frequencies

Microwave and Optical Technology Letters, 2010

A contactless and nondestructive technique is employed for characterizing single-sided metallised... more A contactless and nondestructive technique is employed for characterizing single-sided metallised silicon wafers. The reflection spectra are measured using a quasi-optical millmeter-wave setup in the frequency range 40-320 GHz. The results are compared with those provided by the coplanar waveguide method, in terms of accuracy and range of applicability.

Research paper thumbnail of Ar Implantation, a Passivation Technique for High-Resistivity Silicon within the MCM-D Technology

2006 European Microwave Integrated Circuits Conference, 2006

High-resistivity silicon (HRSi) has excellent properties as substrate material to integrate micro... more High-resistivity silicon (HRSi) has excellent properties as substrate material to integrate microwave passive components and system in a package (SiP) modules. However, the existence of a layer of free surface charges under the silicon-silicon dioxide interface generated by impurities in the SiO2 and in the interface itself undermines the RF properties of the bulk HRSi. This paper demonstrates that the

Research paper thumbnail of Opto controlled substrate losses in a coplanar waveguide on HR-Si

IEEE MTT-S International Microwave Symposium Digest, 2005.

The development of opto-electronic RF switch for millimeter wave applications designed in a multi... more The development of opto-electronic RF switch for millimeter wave applications designed in a multilayer thin-film multichip module technology on HR-Si is discussed in this paper. Insertion loss measurements of a CPW line under illumination demonstrate a contrast of about 40 dB at 100GHz. For the interaction between RF-signal and the photo-induced conductivity, different models have been developed. A D model is used in EM-solvers to predict and study the impact of the photoconductivity modulation. A lumped model is developed as well to make the integration into circuit simulators.

Research paper thumbnail of <title>Optoelectronic control of coplanar transmission lines up to 110 GHz</title>

Microwave and Terahertz Photonics, 2004

ABSTRACT

Research paper thumbnail of Models for opto-electronic controlled coplanar waveguides on high resistive BCB coated Si substrates technology up to 110 GHz

Research paper thumbnail of Transient Effects in Optically Modulated Transmission Line Switches

2006 International Topical Meeting on Microwave Photonics, 2006

Transient effects of optically modulated RF-switches, measured with a large-signal vector network... more Transient effects of optically modulated RF-switches, measured with a large-signal vector network analyzer (LSNA) are discussed in this paper. Light is used to influence the characteristics of a coplanar waveguide (CPW) designed in a multilayer thin-film multichip module (MCM-D) technology on high resistivity silicon (HR-Si). Under static illumination of the CPW line, measurements demonstrate an insertion loss contrast of more

Research paper thumbnail of Simulation and Experimental Verification of W-Band Finite Frequency Selective Surfaces on Infinite Background with 3D Full Wave Solver Nspwmlfma

Progress In Electromagnetics Research, 2010

We present the design, processing and testing of a W-band finite by infinite and a finite by fini... more We present the design, processing and testing of a W-band finite by infinite and a finite by finite Grounded Frequency Selective Surfaces (FSSs) on infinite background. The 3D full wave solver Nondirective Stable Plane Wave Multilevel Fast Multipole Algorithm (NSPWMLFMA) is used to simulate the FSSs. As NSPWMLFMA solver improves the complexity matrix-vector product in an iterative solver from O(N 2) to O(N log N) which enables the solver to simulate finite arrays with faster execution time and manageable memory requirements. The simulation results were verified by comparing them with the experimental results. The comparisons demonstrate the accuracy of the NSPWMLFMA solver. We fabricated the corresponding FSS arrays on quartz substrate with photolithographic etching techniques and characterized the vector S-parameters with a free space Millimeter Wave Vector Network Analyzer (MVNA).

Research paper thumbnail of Effect of inter-element spacings variation on the performance of linear grounded frequency selective surface arrays in W-band

Microwave and Optical Technology Letters, 2010

This article examines the issue of extending the inter-element spacing between slots of equally-s... more This article examines the issue of extending the inter-element spacing between slots of equally-spaced linear grounded frequency selective surface (FSS) arrays with spacing beyond half a wavelength in W-band (75-110 GHz). We present the design, processing, and testing of W-band grounded FSS arrays with different inter-element spacings along transverse electric (TE) and transverse magnetic (TM) field directions separately. The comparison of periodicity changing effects along TE and TM field directions has been reported. The inter-element spacing versus phase curves demonstrate that in some extent the inter-element spacing can be a phase optimization parameter for complex array design. We fabricated the corresponding FSS arrays on quartz substrate with photolithographic etching technique, and characterized the vector S-parameters with a free space MVNA.