Compact Endfire Coupled-Mode Patch Antenna With Vertical Polarization

Tian, Haozhan; Jiang, Lijun; Itoh, T.

doi:10.1109/tap.2019.2922736

Cited by 18 publications

(4 citation statements)

References 14 publications

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“…As a result, the phase difference will always be 90 • at the center frequency. The input feeding will determine which side of the cavity leads the phase [11]. In our design, the right side cavity is directly fed through the coaxial cable and it then leads the phase.…”

Section: Mode Analysismentioning

confidence: 99%

“…The antenna contains two coupled half-mode SIW (HMSIW) cavities. The even and odd eigen-modes are excited inside the structure, similar to the coupled-mode patch antenna [9][10][11]. The design method evolves from filtering theory, where the equivalent circuit model is optimized to realize the target operating frequency and bandwidth.…”

mentioning

confidence: 99%

“…The antenna is backfed through a coaxial cable to the right side cavity. The feeding breaks the symmetry of the excited modes, so that the radiating wave of the right HMSIW cavity leads the phase within the matching band [11]. As a result, RHCP is the co-polarization of the antenna.…”

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confidence: 99%

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Development of a Circularly Polarized Hmsiw Antenna

Itoh¹

2019

PIER Letters

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A circularly polarized (CP) half-mode substrate integrated waveguide (HMSIW) cavitybacked antenna is developed by a novel design method in this paper. The single-fed antenna contains two coupled HMSIW cavities with orthogonal polarizations. Its design method evolves from filter synthesis procedure, which takes the advantage of equivalent circuit model to accelerate the optimization. The antenna radiates high-purity right handed CP waves with measured axial ratio (AR) of 0.33 dB at 3.55 GHz, while its gain and AR bandwidth are comparable to other CP SIW antennas. With the robust design method, the proposed antenna is competitive in practical applications. INTRODUCTIONAntenna with circular polarization (CP) plays an important role in modern wireless communications. It solves the problem of the polarization mismatch caused by the multipath interference and the wave propagation in ionosphere. CP antenna with microstrip technology has been well studied, and the design procedure is mature [1-3]. However, microstrip antennas suffer from high conduction loss, which makes them less competitive in the high-frequency domain.The substrate integrated waveguide (SIW) cavity-based CP antennas have low conduction loss and high gain, while maintaining the advantages of low profile, low cost, and easy integration with planar circuits [4][5][6][7][8]. However, generating pure CP waves in SIW cavities is not as straightforward as that in microstrip patches. The general solutions are either to design two standalone radiating elements [8], or to cut slots on top (or bottom) of the SIW cavity [4][5][6][7]. The first solution requires external feeding to provide the phase difference. For the second one, though widely used, the performance of the antennas is highly dependent on the shape, size, and location of the slots. Therefore, the design procedure typically involves heavy optimization in full-wave simulators, which takes a lot of time and computation.In this paper, a CP antenna with SIW technique is developed by a fast and robust design methodology. The antenna contains two coupled half-mode SIW (HMSIW) cavities. The even and odd eigen-modes are excited inside the structure, similar to the coupled-mode patch antenna [9][10][11]. The design method evolves from filtering theory, where the equivalent circuit model is optimized to realize the target operating frequency and bandwidth. The final structure is directly synthesized from the circuit model, avoiding the heavy optimization in full-wave simulator. The proposed antenna has very low axial ratio (AR) at target frequency while still maintaining decent gain and AR bandwidth. The design procedures, along with the results and discussions, are presented in the following sections. DESIGN METHOD AND THEORYThe schematic layout of the proposed antenna is shown in Fig. 1. Two identical HMSIW cavities have orthogonal polarization to each other. A gap on the center wall brings magnetic coupling between the

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Section: Mode Analysismentioning

confidence: 99%

mentioning

confidence: 99%

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Development of a Circularly Polarized Hmsiw Antenna

Itoh¹

2019

PIER Letters

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“…Magnetic‐current radiators 5‐7 became more attractive for endfire radiation, when the communication system needs to consider the vertical polarization radiation. Especially the antennas need to be mounted on a large conducting plane, such as the applications in the unmanned aerial vehicle.…”

Section: Introductionmentioning

confidence: 99%

Design of wideband end‐fire composite microstrip‐monopole antenna

Yang

Liu

et al. 2021

Int J RF Microw Comput Aided Eng

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This article introduces a wideband composite antenna with end‐fire radiation. The structure is achieved by uniting a center‐fed microstrip shorted patch and a parasitical monopole. The monopole is vertical to the substrate and work as an electric current source. Because the loaded monopole breaks the symmetry of the center‐fed microstrip antenna, the original patch antenna can work as in‐phase equivalent magnetic current sources radiation. Then complementary sources are generated by orthometric magnetic current source and electric current source. The typical unidirectional radiation capacity has a good endfire beam. The loaded monopole adds a resonant mode to the original microstrip antenna, which makes the composite microstrip‐monopole antenna to exhibit an enhanced bandwidth of 26.9% and an average gain of 7.5 dBi. The complementary sources radiation mechanism can generate special unidirectional radiation patterns in a compact space, so this antenna type is an excellent candidate for array applications. The prototype's planar size is only 0.36λ0 × 0.39λ0 (λ0 is the free space wavelength in center frequency). The eight elements phased array with the proposed antenna show perfect simulated scanning performance.

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Azimuth-Pattern Reconfigurable Planar Antenna Design Using Characteristic Mode Analysis

2021

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In this paper, a patch antenna is proposed with reconfigurable patterns in the azimuth plane. The basic structure of the antenna is a circular patch upon which a vertical slot is etched. In addition, a row of shorting posts along the horizontal direction is placed underneath the patch. With the aid of characteristic mode analysis (CMA), reconfigurable patterns are achieved by synthesizing the currents of different modes. By switching over different sets of feeding ports, four steerable beams capable of covering the entire azimuth plane are obtained. One unique feature is that when the beam is switched to the direction orthogonal to it, the shape of the pattern will be switched accordingly. The antenna was fabricated and measured. The measured F/B ratio is close to 10 dB at 2.08 GHz, and the 3-dB beamwidth in the elevation (azimuth) plane is switchable from 82°(181°) to 190°(91°).INDEX TERMS Characteristic mode analysis, reconfigurable pattern, switchable beam.

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Compact Endfire Coupled-Mode Patch Antenna With Vertical Polarization

Cited by 18 publications

References 14 publications

Development of a Circularly Polarized Hmsiw Antenna

Development of a Circularly Polarized Hmsiw Antenna

Design of wideband end‐fire composite microstrip‐monopole antenna

Azimuth-Pattern Reconfigurable Planar Antenna Design Using Characteristic Mode Analysis

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