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Series‐fed circularly polarized microstrip antennas with broad bandwidth
Author(s) -
Mao ShauGang,
Chen ShiouLi,
Yeh JenChun,
Lin TienMin
Publication year - 2007
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2006rs003562
Subject(s) - optics , physics , microstrip antenna , patch antenna , radiation pattern , antenna efficiency , turnstile antenna , circular polarization , antenna factor , antenna measurement , antenna (radio) , microstrip , telecommunications , computer science
A new series‐fed circularly polarized antenna (SFCPA) in microstrip configuration, which consists of a traveling‐wave‐type crank‐line antenna (CLA) and a resonant‐type square‐ring slot antenna (SRSA), is developed. Unlike the conventional crank‐line (CL) antenna array with an open end or a resistive load, the proposed SFCPA uses the SRSA at the termination of the CLA and thus exhibits not only a broad circularly polarized (CP) bandwidth but also a large antenna gain. The characteristics of the SFCPA, including the leaky‐wave radiation and the circular polarization, are examined in terms of the dispersion diagram and the current distribution. The SFCPA with the two‐cell CLA and the terminated SRSA is fabricated and measured to demonstrate the 10‐dB return loss and 3‐dB axial ratio (AR) bandwidths of 34.3% and 30.5%, respectively. The frequency‐scanning radiation patterns with a 5–7 dBi antenna gain are also presented in the operating band.