Low Cross-Polarization SIW Slots Array Antenna With a Compact Feeding Network

A low cross-polarization-slotted substrate-integrated waveguide (SIW) cavity planar array antenna, which consists of four symmetrically arranged linear arrays, is presented in this letter. The linear array is fed through a coaxial probe located at the center of the SIW cavity, which ensures that two...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2021-02, Vol.20 (2), p.189-193
Main Authors: Yang, Tianming, Zhao, Zhiqin, Yang, Deqiang, Nie, Zaiping
Format: Article
Language:English
Subjects:
Amplitudes
Antenna arrays
Antenna measurements
Antennas
Bandwidth
Bandwidths
Cross polarization
Impedance
Linear antenna arrays
Linear arrays
Low cross polarization
Planar arrays
Resonant frequencies
Resonant frequency
Sidelobes
SIW
Slot antennas
slotted substrate integrated waveguide (SIW) cavity
Substrate integrated waveguides
wide impedance bandwidth
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Summary:A low cross-polarization-slotted substrate-integrated waveguide (SIW) cavity planar array antenna, which consists of four symmetrically arranged linear arrays, is presented in this letter. The linear array is fed through a coaxial probe located at the center of the SIW cavity, which ensures that two quasi-TE 150 modes with approximate frequencies can be excited simultaneously. Therefore, the impedance bandwidth can be significantly improved by merging the two resonant frequencies. When the adjacent linear arrays are fed by reversed phase signals with uniform amplitude, extremely low cross polarization can be achieved in both E - and H - planes. The alternative reversed phase signals with uniform amplitude are simply generated by a compact SIW TE 410 mode cavity. Measured results show that the proposed 4 × 4 planar array antenna achieves an impedance bandwidth ranging from 9.9 to 10.34 GHz. Within the operating band, the gain varies from 12.5 to 14.9 dBi. In E and H planes, the cross-polarization level is lower than −52.1 dB within the half-power beamwidth, and the sidelobe levels are below −13.4 and −18.4 dB, respectively. The aperture efficiency is up to 51.5%.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2020.3043774