Dual-Band Antennas Research Papers - Academia.edu (original) (raw)

An investigation is carried out into the design, modelling, construction and testing of a new, unique, bat bow-tie self grounded antenna. The purpose is to use it for the application of a dual band WiFi modem operating between the frequency ranges of 2.4-2.5Ghz and 5-6GHz. The antenna was a success and theoretically had a VSWR less than 2:1 and increased signal strength by 3db which corresponded to double the power. The existing model was analyzed and the results of the measurements and testing led to an upgraded MIMO model.

Transmit array design is more challenging for dual-band operation than for single band, due to the independent 360° phase wrapping jumps needed at each band when large electrical length compensation is involved. This happens when aiming at large gains, typically above 25 dBi with beam scanning and F/ D ≤ 1. No such designs have been reported in the literature. A general method is presented here to reduce the complexity of dual-band transmit array design, valid for arbitrarily large phase error compensation and any band ratio, using a finite number of different unit cells. The procedure is demonstrated for two offset transmit array implementations operating in circular polarization at 20 GHz(Rx) and 30 GHz(Tx) for Ka-band satellite-on-the-move terminals with mechanical beam-steering. An appropriate set of 30 dual-band unit cells is developed with transmission coefficient greater than −0.9 dB. The full-size transmit array is characterized by full-wave simulation enabling elevation beam scanning over 0°−50° with gains reaching 26 dBi at 20 GHz and 29 dBi at 30 GHz. A smaller prototype was fabricated and measured, showing a measured gain of 24 dBi at 20 GHz and 27 dBi at 30 GHz. In both cases, the beam pointing direction is coincident over the two frequency bands, and thus confirming the proposed design procedure.

- by Jorge Costa and +1
- •
- Antennas, Microstrip Antennas, Antennas & Radio Wave Propagation, Microstrip Antennas and Arrays

This work presents a compact dual-band bandpass filter (BPF) based on stub-loaded rectangular loop stepped impedance resonator (SLRLSIR). The proposed SLRLSIR consists of two outer open-circuited and two inner open-circuited stubs, which are designed to the central sides of the rectangular loop resonator. Owing to its symmetry, even-and odd-mode analysis methods are applied to deduce the equivalent-circuit equations and to justify the structural design. The second passband can be easily tuned by changing the two inner open-circuited stubs when the first passband is fixed at a desirable frequency. The upper stopband is improved by a pair of additional open-circuited stubs stepped impedance resonators at the I/O ports. Transmission zeros are generated between passbands and stopbands. A SLRLSIR prototype dual-band BPF with central frequencies of 2.42/4 GHz is fabricated and systematically studied. The measurement results agreed well with the simulation results. KEYWORDS Bandpass filter (BPF), Bended microstrip feed line (BMFL), Dual-band, Stub-loaded rectangular loop stepped impedance resonator (SLRLSIR), Transmission zero (TZ)

Achieving a particular response to serve multiple wireless applications is regarded as the primary demand in our modern age because of the considerable development of the communication devices. In this paper, a compact monopole antenna with reduced ground plane has been suggested to meet the requirements of the dual-band WLAN applications. The antenna miniaturization has been carried out in employing two techniques. Initially, the fractal geometry has been applied to the antenna radiating element. Two-sided Koch fractal curves up to the third iteration have been used to increase the path of electrical current on the surface of the radiating element which is in the form of a square with dimensions. To gain more miniaturization, the antenna ground plane has been further reduced by using different lengths of two open-ended parallel stubs to form a virtually extended ground plane. This supportive technique has been adopted as a tuning means to control the path of the electrical currents exciting the resulting resonances. The proposed antenna and has been printed on an FR-4 substrate with a thickness of 1.6 mm and 4.4 relative dielectric constant and is fed by 50-ohm microstrip feed line. The resulting antenna dimensions are of about 18.93 mm × 18.93 mm. A parametric study has been carried out, and the results reveal that the proposed antenna offers a dual-band performance with a considerable ratio of resonant frequencies covering the existing 2.4/5.8 GHz WLAN applications, besides many other communication services. Measured results of a fabricated prototype show the validity of the proposed methodology to design a compact size dual-band antenna.

- by Jawad K. Ali
- •
- Antenna Design, Multiband antenna, Dual-Band Antennas

A novel dual-band waveguide slot array antenna with low cross-polarisation is proposed. The main structure of the proposed antenna consists of two waveguides in which the top broad wall of the smaller waveguide, a WR-28 Ka-band waveguide, is connected to the top broad wall of the larger waveguide, a WR-90 X-band waveguide. The WR-28 waveguide operating in the higher frequency band of the proposed antenna acts as a ridge inside the WR-90 waveguide operating in the lower frequency band. For achieving a suitable side lobe level (SLL) and cross-polarisation in the lower frequency band, the slots are placed close to the higher frequency waveguide and side ridges are placed beside each slot. A 2D graph is presented in which the normalised resonance conductance versus the offset of a side ridge from the outer edge of the lower frequency waveguide is shown, while the slot is located between the higher frequency waveguide and the side ridge. By applying proper coefficients to this graph, appropriate offsets from the outer edge of the lower frequency waveguide for the side ridges are obtained so that a low SLL can be realised.

- by Sajad Mohammad-Ali-Nezhad and +1
- •
- Antennas, Linear Arrays, Antenna arrays, Antenna

The design of a fractal based slot antenna, to serve the dual-band communication applications, is proposed in this paper. The structure of the proposed antenna is based on the Koch snowflake fractal geometry of the third iteration as applied to the outer and inner perimeters of an annular ring slot configuration. The antenna slot structure has been etched on one side of a substrate representing its ground plane, and a microstrip line feed is printed on the other side. The realized results proved that the proposed antenna could excite three resonant modes. The first one was assigned for the lower resonating band from (2.24-2.93) GHz, while the second and third modes have been merged forcibly to generate the upper resonating band from (4.48-5.54) GHz. In terms of the guided wavelength, λg, the resulting antenna has a compact size of 0.57λg × 0.57λg. The results reveal that the antenna yields two resonant bands with a significant extent of the frequency ratio. To improve the antenna performance at the two resonant bands, investigation of current density distributed on the surface of the antenna is conducted at selected frequencies within the swept range. With the aid of this study, it has been found that when applying a defected ground structure (DGS) on the antenna ground plane, it can be considered as a tuning means of the two resonant bands. Measured results carried out on two fabricated prototypes confirm those theoretically predicted.

- by Hussain A. Hammas and +1
- •
- Fractal Geometry, Antenna Design, Fractal antenna, Antenna, Dual-Band Antennas

A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm 3. The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.

The design of planar spiral monopole antenna and the details of antenna dual-band operation are presented in this paper. One-turn spiral geometry has been implemented in order to produce two different modes of printed monopole antenna. Optimizing the antenna layout makes it possible to control the frequency bands and thus to design antennas used for different applications, such as 3G/4G mobile terminals and human BAN wireless nodes. Important information on the final-paper submission procedure is also provided.

This chapter focuses on the design of E-shaped dual bandMIMO antenna intended for 5G mobile applications. It
operating at 3.3 GHz and 32 GHz. The antenna designed in this letter are different from traditional 5G antennas, the antenna of
this paper is perpendicular to the edge of the system circuit board, it can be applied to the popular full-screen mobile phone. The
antenna was designed by using FR-4 substrate material with relative permittivity is 4.3 and it results Right hand Circular
Polarization. Simulation has been realized using ANSYS HFSS Software.

- by IJRASET Publication
- •
- Substrate, Dual-Band Antennas, 5g Network

A dual-band miniaturized Ka-band filter is presented, taking advantage of transmission in cutoff rectangular waveguides periodically loaded in the E-plane with split-ring resonators (SRRs). High selectivity, wide bandwidth, and high out-of-band rejection are achieved in a compact form factor. The use of SRRs in a waveguide configuration proves to be a valid and promising solution for the design of dual-band filters. The filter is specifically designed for Ka-band, and a prototype was manufactured and its performance measured, providing a reasonably flat transmission at both 20-and 30-GHz subbands. For both bands, the power roll-off rate is higher than 55 dB/decade, translating into a sharper than 10-dB drop per 0.2 GHz in a 38 × 6.6 × 4.5-mm 3 device. The filter half-power bandwidth is B_20 = 1.1 GHz at 20 GHz (18.4–19.5 GHz) and B_30 = 1.2 GHz at 30 GHz (27.8–29.0 GHz).

- by Denis BUKURU
- •
- Electronic Engineering, Media Studies, Wireless Communications, Power Electronics

This paper proposes a dual-band microstrip patch
antenna to operate at both WLAN Bluetooth band (2.2 GHz to
2.83 GHz) and ultra-wide-band (4.7 GHz to 12.69 GHz). The
proposed antenna is a modified version of an UWB microstrip
antenna. The antenna’s radiation pattern is almost quasi/partial
omni-directional and its highest gain level is reached to 5.23 dB.
This antenna can be used for wireless body area network
(WBAN) sensors, which currently rely on Bluetooth and UWB
frequency Besides, this antenna may found other possible areas
of operation e.g. wireless router, RFID tag, GPS tracker, ambient
RF energy harvesting at the frequency range of ISM bands.

— This paper presents a novel design and analysis on a dual-band circularly-polarized transmit-array unit-cell based on miniaturized elements. The proposed structure is a two dimensionally anisotropic structure composed of capacitive patches, inductive split rings, and an inductive grid. The structure is designed to respond differently to each orthogonal component of a circular polarized wave illuminating the transmit-array and transmits a circularly polarized plane wave. The proposed structure operates at 10.8 GHz and 16.7 GHz with transmission coefficients above-1 dB at both. The simulated and measured results of the unit-cell prototype agree well.

A shaped double-shell dielectric lens is evaluated as a primary feed for a multibeam single-reflector system operating in the satellite uplink and downlink Ka-bands, complying with gain and edge-of-coverage (EoC) directivity requirements. An assembly of dual-band printed feeds is integrated at the base of a single lens, each feed producing a virtual focus far behind the lens base and coincident with the reflector focal arch. The used double-shell lens approach, instead of a single-material lens, allows an extra degree of freedom to accommodate an aberration mitigation condition. This primary feed system is proposed as a low-complexity solution to enable fitting more beams per solid angle than conventional single-feed-per-beam systems based on a cluster of focal-plane horns. A proof-of-concept lens prototype with 87 mm diameter and 62 mm height, fed by a linear arrangement of five dual-band printed feeds, was fabricated and tested at the Ka-band. The lens measured radiation patterns were post-processed to evaluate the combined performance of the lens with an offset F/D 1 reflector system designed for 45-dBi EoC directivity. It is shown that it duplicates the reflector aperture efficiency compared to horn-fed systems with same feed separation. Index Terms—Dual-band antenna, multibeam antennas, reflector antennas, shaped double shell-lens antenna.

- by Jorge Costa and +2
- •
- Antennas, Antennas & Radio Wave Propagation, Integrated Lens Antennas, Dual-Band Antennas

This paper presents a novel dual-band annular patch antenna with functional microstrip circuit module to reconfigure the polarized modes of the antenna. The proposed antenna consists of two bonded FR4 print circuit boards and is excited at WLAN band and WiMAX band by this functional circuit module. This module includes two branches of microstrip lines, two PIN diodes and a DC bias circuit. Two PIN diodes are placed on the two microstrip lines. The polarization of the antenna can be simply shifted back and forth between RHCP and LHCP by modifying the modes of PIN diode. Simulation and experimental results have shown a good bandwidth of axial ratio and antenna gain in circularly polarized states.

The working principle of a thin dual-band dual-linear to circular polarizer is presented here. This polarizer not only converts incident linearly polarized (LP) waves to circularly polarized (CP) waves in two frequency bands, but it also reverses the handedness of each signal. The electromagnetic behavior of the cell is carefully analyzed and two equivalent circuit models (ECMs) are presented to model the responses of the cell to linearly polarized waves at normal incidence. The ECMs show how utilizing interlayer coupling can be leveraged to achieve reversed CP senses in two bands using a compact design. Analytical formulas are presented to provide initial values of the ECM components including the mutual coupling inductances. We present measurement results that agree well with the full-wave simulation and the ECM results, thus validating the proposed ECM model.

- by Jorge Costa and +1
- •
- Antennas, Microstrip Antennas, Antennas & Radio Wave Propagation, Microstrip antenna design

This paper presents a new wideband microstrip circular patch antenna (MCPA) fed by proximity-coupled line with double-stub matching to achieve dual-band operation. Bandwidth extension is achieved by exciting higher-order modes in the circular radiating patch, and using two stubs to achieve adequate matching across the obtained two bands. The characteristics of the antenna such as reflection coefficient, impedance bandwidth, gain and radiation pattern are investigated and optimized through parametric studies using the CST Microwave Studio Suite. The antenna achieved a large relative bandwidth of 45.16% at the upper band, while the lower one has 10.3% relative bandwidth. The maximum achieved gain of the dual-band antenna in the 5.8GHz band is 4.62dBi while it is 4.85dBi in the upper band. The antenna has an overall size of 30×30×3.2mm3 corresponding to 0.58λ × 0.58 λ × 0.062 λ at the lower band of 5.8 GHz. The proposed antenna should be useful for WLAN and X-band communication systems.

In this study, we suggest and experimentally validate a methodology for fast and optimized design of dual-band implantable antennas for medical telemetry (MICS, 402-405 MHz, and ISM, 2400-2480 MHz). The methodology aims to adjust the design of a parametric dual-band antenna model towards optimally satisfying the requirements imposed by the antenna-fabrication procedure and medical application in hand. Design is performed in a systematic, fast, and accurate way. To demonstrate its effectiveness, the proposed methodology is applied to optimize the parametric antenna model for intra-cranial pressure (ICP) monitoring given a specific antenna-fabrication procedure. For validation purposes, a prototype of the optimized antenna is fabricated and experimentally tested. The proposed antenna is further evaluated within a 13-tissue anatomical head model in terms of resonance, radiation, and safety performance for ICP monitoring. Extensive parametric studies of the optimized antenna are, finally, performed. Feasibility of the proposed parametric antenna model to be optimally re-adjusted for various scenarios is demonstrated, and generic guidelines are provided for implantable antenna design. Dual-band operation is targeted to ensure energy autonomy for the implant. Finite Element (FE) and Finite Difference Time Domain (FDTD) simulations are carried out in homogeneous rectangular and anatomical head tissue models, respectively.

- by Andrey S Andrenko
- •
- Antennas, Pifa Antenna, Dual-Band Antennas, Planar Inverted F Antenna

In this paper, a crossed dipole antenna based on Pyrex Glass substrate is proposed for dual bands, GSM 900 MHz and Wi-Fi 2.4 GHz. Each dipole is placed on a side of the substrate with the antennas oriented perpendicular to each other. Both antennas participate in an omnidirectional radiation pattern in perpendicular planes to form a radiation pattern similar to the isotropic. The realised gain for each dipole and the total radiation efficiency are 1.46 dB and 88% respectively. The glass substrate provides a reduction in the antenna size of about 36% compared with typical individual elements in free space.

- by Hameed R. Farhan
- •
- Energy Harvesting, Dual-Band Antennas, Dipole Antennas

This paper presents the modeling and design of 2-element compact ceramic chip antenna for UMTS/GPS dualband mobile handset applications. First, the design of ceramic chip monopole integrated with a simple matching circuit will be explained. The radiation characteristics including high gain
and total efficiency of the proposed compact antenna element
will be presented. Next, 2-element antenna system for dualband handset design where one antenna element is used for UMTS operation while the another one works as an assisted
GPS (A-GPS) antenna will be introduced. Parametric study
illustrating the effect of antenna elements separation on the
mutual coupling between antenna ports will be analyzed. It
has been shown that low mutual coupling is the result of strong current being induced on the 3D monopole placed
inside high density dielectric ceramic pad.

- by Muayad Kod
- •
- Multidisciplinary, Energy Harvesting, Dual-Band Antennas, Dipole Antennas

This paper presents a bandwidth enhancement of a dual-band bi-directional rectangular microstrip patch antenna. The novelty of this work lies in the modification of conventional rectangular microstip patch antenna by using the combination of two techniques: a complementary split ring resonator (CSRR) and a defected patch structure (DPS). The structure of antenna was studied and investigated via computer simulation technology (CST). The dimension and position of CSRR on the ground plane was optimized to achieve dual bandwidth and bi-directional radiation pattern characteristics. In addition, the bandwidths were enhanced by defecting suitable shape incorporated in the microstrip patch. A prototype with overall dimension of 70.45×63.73 mm2 has been fabricated on FR-4 substrate. To verify the proposed design, the impedance bandwidth, gain, and radiation patterns were carried out in measurements. The measured impedance bandwidths were respectively 560 MHz (3.08-3.64 GHz) and 950 GHz (4.64-5.59 GHz) while the measured gains of each bandwidth were respectively 4.28 dBi and 4.63 dBi. The measured radiation patterns were in good agreement with simulated ones. The proposed antenna achieves wide dual bandwidth and bidirectional radiation patterns performances. Consequently, it is a promising candidate for Wi-Fi or 5G communications in specific areas such as tunnel, corridor, or transit and rail.

- by maysam hussein
- •
- Millimeter Waves, Microstrip Antenna, Antenna arrays, PATCH ANTENNA

- by Sameer Hussein
- •
- Millimeter Waves, Microstrip Antenna, Antenna arrays, PATCH ANTENNA

This paper presents the modeling and design of 2-element compact ceramic chip antenna for UMTS/GPS dual-band mobile handset applications. First, the design of ceramic chip monopole integrated with a simple matching circuit will be explained. The radiation characteristics including high gain and total efficiency of the proposed compact antenna element will be presented. Next, 2-element antenna system for dual-band handset design where one antenna element is used for UMTS operation while the another one works as an assisted GPS (A-GPS) antenna will be introduced. Parametric study illustrating the effect of antenna elements separation on the mutual coupling between antenna ports will be analyzed. It has been shown that low mutual coupling is the result of strong current being induced on the 3D monopole placed inside high density dielectric ceramic pad. Mobile handset applications of the proposed compact 2-element antenna system will be discussed in the details at the Conference.

- by Andrey S Andrenko
- •
- Global Positioning System, Ceramics, Small Antennas, Dual-Band Antennas

A novel Asymmetric Coplanar Strip (ACS) fed antenna with Defected Ground Structure (DGS) suitable for dual application is presented. The Method of Moments (MoM) based mentor graphics IE3D electromagnetic solver has been used for this design. Dual band operation has been obtained by modifying the ground plane of the proposed design with spur-slots. It has been fabricated and tested with the overall size of 21x15x1.6 mm3. The measured results indicate that the proposed antenna yields <-10dB impedance bandwidth of 13.13% and 9.86% which meets the requirement of 3.5GHz and 5.5GHz Wireless Local Area Network (WLAN) and World Wide Interoperability Microwave Access (WiMAX) applications. The approximate lumped equivalent circuit extraction for the proposed DGS fed dual band antenna has been discussed in detail. Because of its stable radiation patterns with low cross polarization,miniature size, high average antenna gain of 2.5dBi and good electromagnetic characteristics, the proposed antenna is a promising candidate for dual mode wireless communication devices.

With the advancements in optical and satellite
communications for high speed long range data transmissions,
serrated antennas plays a vital role. In this work we have
designed a Edge Serrated Microstrip Patch antenna used for these
applications has been modeled on FR4 substrate as a dielectric
medium which has a relative permittivity value of 4.4. The
proposed antenna was resonating at two different frequencies in
L & S band Microwave frequency ranges. This antenna was fed
with coaxial feeding and was designed in a software HFSS.

- by IJSRP Journal
- •
- Microstrip Antennas, Dual-Band Antennas, Rectangular Microstrip, Serrated Antenna