학술논문

Design and Analysis of a Novel Wide-Angle Scanning Stub-Loaded Cavity Array Element
Document Type
Periodical
Source
IEEE Open Journal of Antennas and Propagation IEEE Open J. Antennas Propag. Antennas and Propagation, IEEE Open Journal of. 3:783-797 2022
Subject
Fields, Waves and Electromagnetics
Communication, Networking and Broadcast Technologies
Aerospace
Antenna arrays
Phased arrays
Antennas
Apertures
Periodic structures
Slot antennas
Planar arrays
Planar phased arrays
dual-polarized cavity antenna
scan blindness
SatCom on the move
Language
ISSN
2637-6431
Abstract
A novel design methodology is presented to mitigate scan blindness in cavity antenna arrays without the need for any changes on the radiating structure itself. For a first proof-of-concept demonstration, a fully PCB-compliant dual-polarized cavity element is loaded by vertical stubs to manipulate the dispersion characteristics in the aperture plane. In contrast with its conventional cavity antenna counterpart, the proposed stub-loaded unit cell element shows through scattering and eigenmode analysis that the vertical stubs may effectively enhance the antenna’s wide-angle scan performance by preventing the onset of surface and leaky wave resonances. Owing to this additional design freedom, an element gain improvement of at least 1 dB is achieved, due to a truly TE and TM mode-free characteristic along the lateral directions. A dual-polarized 11 $\times$ 11 array prototype was implemented. The measurement results are in very good agreement with those obtained by full-wave simulations. The realized stub-loaded cavity element exhibits reflection coefficients lower than −10 dB with a very low inter-port coupling $\vartheta$ )-pattern for 60° E- and H-plane scans from 28 GHz to 31.5 GHz without oversampling the aperture.