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Compact dual‐band circularly polarized filtering patch antenna using dispersive delay line
Author(s) -
Wang Wenwei,
Chen Chunhong,
Wang Shiyan,
Wu Wen
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32563
Subject(s) - multi band device , optics , phase difference , patch antenna , antenna (radio) , physics , circular polarization , group delay and phase delay , polarization (electrochemistry) , turnstile antenna , radiation , orthogonal polarization spectral imaging , phase (matter) , microstrip antenna , computer science , coaxial antenna , telecommunications , microstrip , bandwidth (computing) , chemistry , quantum mechanics , laser
A compact dual‐band circularly polarized (CP) filtering patch antenna is proposed by adopting the dispersive delay line (DDL) in this article. The in‐band and out‐of‐band phase differences of two orthogonal components are effectively controlled by the DDL to realize opposite polarization states. As perfect isolation is achieved between left‐hand circular polarization and the right‐hand one in CP antenna, by controlling the parameters of DDL, four radiation nulls are presented simultaneously, and their locations are directly determined by the phase difference, thus obtains good filtering performance with compact structure. For demonstration, dual‐band CP patch antenna is designed at 2.4 and 5.8 GHz for WLAN applications based on DDL. The simulated and measured results of fabricated prototypes show good agreement. Good out‐of‐band rejection is observed in this design, which verifies the feasibility of the proposed CP filtering strategy.