Multimode phased array element for wide scan angle impedance matching

Tang, R.; Wong, N. S.

doi:10.1109/proc.1968.6770

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…Scan performance over wide angles can be improved by several techniques including selective excitation of higher modes in the radiating unit cell and careful use of external dielectric loading (Wheeler, 1968;Tang and Wong, 1968). For example, waveguide radiators can use dielectric inserts, and dielectric cover plates.…”

Section: Wide Angle Impedance Matchingmentioning

confidence: 99%

Harold wheeler and phased arrays

Hansen¹

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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Section: Wide Angle Impedance Matchingmentioning

confidence: 99%

Harold wheeler and phased arrays

Hansen¹

2012

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation

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“…Probably the most effective way of producing the optimum mix of modes uses open-end waveguide radiators, rectangular or circular, with the waveguide internal environment or the external environment suitably modified. Tang and Wong (1968) and Wong et al (1972) use a dielectric plug at the rectangular guide mouth and a matching post. Tsandoulas (1972) uses rectangular waveguide width and height steps (in different planes).…”

Section: Scan Compensation and Blind Anglesmentioning

confidence: 99%

Mutual Coupling

2009

Phased Array Antennas

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“…The in-line coaxial-to-waveguide transition has been proposed since the 1960s [20] and it has been employed to feed open-waveguide arrays [21]. The L-shaped coaxial configurations [22,23] are a first common technique to short the launcher, but a folded conductor is a challenging task, especially in mm-wave technology, and it is overcome by patch antenna launchers [24] or by shorting the launcher directly on a tapered ridge or multi-section one quarter wavelength-length transformer ridges, which allow the matching over a wide bandwidth [25,26].…”

Section: Introductionmentioning

confidence: 99%

An In-Line Coaxial-to-Waveguide Transition for Q-Band Single-Feed-Per-Beam Antenna Systems

et al. 2021

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An in-line transition between a coaxial cable and rectangular waveguide operating in Q-band (33–50 GHz) is presented. The aim of the work is to minimize the modifications in the waveguide to the strictly necessary to overcome the manufacturing issues due to the high frequencies involved. In addition, the transition is compact and it does not increase the space occupation on the transverse section, this suggests its application in horn antennas clusters arrangement. The operating principle consists of both a modal conversion and an impedance matching between the devices. The modal conversion is realized in an intermediate region, where the coaxial penetrates in the waveguide: the device geometry is designed so that the electric field in the transition is a trade-off between the TEM mode of the coaxial and the TE10 of the guide. A shaped waveguide backshort and a reactive air gap in the coaxial cable co-participate to achieve the matching. An optimized Chebyshev stepped transformer completes the transition to fulfil the impedance mismatch with the full waveguide. The design issues and technological aspects are considered. The influences of the feeding pin misalignment, the presence of groove is included in the analysis and these practical aspects are discussed and numerically validated via the scattering parameters analysis of the proposed design. The return loss is higher than 25 dB over the whole Q-band.

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Multimode phased array element for wide scan angle impedance matching

Cited by 15 publications

References 5 publications

Harold wheeler and phased arrays

Harold wheeler and phased arrays

Mutual Coupling

An In-Line Coaxial-to-Waveguide Transition for Q-Band Single-Feed-Per-Beam Antenna Systems

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