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Novel dual‐band circularly polarized slot antenna with asymmetrical stubs
Author(s) -
Sung Youngje
Publication year - 2020
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.32538
Subject(s) - multi band device , turnstile antenna , physics , axial ratio , antenna (radio) , optics , square (algebra) , antenna measurement , slot antenna , circular polarization , electrical engineering , engineering , microstrip , mathematics , geometry
In this paper, we propose a slot antenna with circularly polarized (CP) characteristics in two frequency bands. The proposed antenna consists of a square wide slot with a square patch in the center and a pair of stubs for radiator asymmetry. The proposed antenna shows right‐hand CP characteristics at 1.88 GHz and left‐hand CP characteristics at 4.41 GHz. The proposed antenna has measured impedance bandwidths of 24.3% (1.77‐2.26 GHz) and 33.4% (3.84‐5.38 GHz) in the lower and upper bands, respectively. The measured 3‐dB axial‐ratio bandwidths are 4.4% (1.78‐1.86 GHz) and 7.9% (4.25‐4.6 GHz), respectively. Details of the design considerations of the proposed antenna are described and experimental results for its dual‐band CP performance are presented and discussed.