A wideband planar Continuous Transverse Stub (CTS) array antenna with ultra-high aperture efficiency is presented in this paper. It consists of three metal layers including radiation slots and power divider feed network. Multiple-section stepped-impedance transformers are used for wideband impedance matching of the radiation slots. The power divider feed network is composed of a single-ridge waveguide planar power divider layer and a cavity layer, which replaces the conventional pillbox coupler, significantly reducing the profile of the feed network. The aperture efficiency and gain are enhanced by the equal amplitude and in-phase output in all ports. An antenna prototype is fabricated and the radiation performance is measured. Excellent agreement is achieved between the results of simulation and measurement. Measured results indicate that the reflection coefficient |S11| is less than -10 dB over the band of 9.6-15.7 GHz, and the fractional bandwidth is 48.2%. Within the operating frequency band of 10-14 GHz that the application mainly focuses on, the measured gain of the prototype is 25.24-28.16 dBi and an ultra-high aperture efficiency of over 88% is achieved.
LIU Chengxin
,
HE Lianxing
. An ultra-high aperture efficiency broadband continuous transverse stub planar array antenna[J]. Journal of University of Chinese Academy of Sciences, 0
: 7
-7
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DOI: 10.7523/j.ucas.2025.033
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