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Planar integrated substrate integrated waveguide circularly polarized filtering antenna
Author(s) -
Hua Changzhou,
Liu Meng,
Lu Yunlong
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21517
Subject(s) - optics , planar , bandwidth (computing) , axial ratio , coaxial antenna , resonator , slot antenna , center frequency , waveguide , materials science , physics , optoelectronics , antenna (radio) , antenna measurement , microstrip antenna , circular polarization , electrical engineering , microstrip , telecommunications , computer science , engineering , band pass filter , computer graphics (images)
A new design of substrate integrated waveguide (SIW) circularly‐polarized (CP) filtering antenna is presented, which is based on dual‐mode (TE 102 and TE 201 ) cavities. The satisfying filtering performance of the antenna is realized by a coupled‐resonator circuit of two dual‐mode SIW cavities. And the radiating element of the antenna is a cavity‐backed CP slot antenna which is formed by a nonuniform ring slot integrated with the back cavity. To demonstrate the idea, a prototype antenna operating at X band is designed, fabricated, and measured. Measured results show that the 10‐dB impedance bandwidth is 4.2% (from 11.6 to 12.1 GHz), the 3‐dB axial‐ratio (AR) bandwidth is 4%, and the gain is 5.6 dBi at the center frequency of 11.8 GHz.