Slot-Coupled Circularly Polarized Array Antenna With Substrate-Integrated Waveguide Cavity for Parallel-Plate-Mode Suppression

A slot-coupled circularly polarized (CP) patch antenna with parallel-plate-mode (PPM) suppression for phased array systems is presented in this paper. The radiation performances of the CP array antenna with PPM suppression are improved using a substrate-integrated waveguide (SIW) cavity. In order to...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2017-08, Vol.65 (8), p.3999-4006
Main Authors: Kim, Youngsub, Yoon, Young Joong
Format: Article
Language:English
Subjects:
Antenna arrays
Cavity resonators
Cavity-back
Circuit design
Circular polarization
Coupled modes
Feeding
Feeds
Gain
Impedance
mode suppression
parallel-plate mode (PPM)
Patch antennas
Scanning
Slot antennas
slot-coupled patch antenna
Substrate integrated waveguides
substrate-integrated waveguide (SIW) cavity
Substrates
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Description
Summary:A slot-coupled circularly polarized (CP) patch antenna with parallel-plate-mode (PPM) suppression for phased array systems is presented in this paper. The radiation performances of the CP array antenna with PPM suppression are improved using a substrate-integrated waveguide (SIW) cavity. In order to obtain a high isolation between the feeds of a feeding circuit, the cavity size and locations of the feeds are attentively designed. In addition, the performances of the proposed array antenna are thoroughly investigated. A comparative study between antennas (with and without the SIW cavity) is presented, involving both simulation and measurement. The proposed antenna with the SIW cavity has a 17-dB lower mutual-coupling level compared with the antennas without the SIW cavity; the individual antennas in the array, therefore, present more consistent and reliable characteristics in terms of impedance and radiation performances. The beam scanning performance of an 8 × 8 phased CP array system is experimentally validated, and shown to exhibit the expected improvements in terms of gain, cross-polarization level, and axial ratio. The obtained results clearly demonstrate the advantages of the proposed antenna for CP phased array systems.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2017.2712160