Open AccessCircularly polarised half E‐shaped patch antenna: a compact and fabrication‐friendly design
Author(s) -
Kovitz Joshua M.,
Rajagopalan Harish,
RahmatSamii Yahya
Publication year - 2016
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2015.0550
Subject(s) - fabrication , bandwidth (computing) , broadband , impedance matching , patch antenna , wavelength , microstrip antenna , axial ratio , electrical impedance , optics , materials science , computer science , optoelectronics , electronic engineering , physics , acoustics , antenna (radio) , telecommunications , engineering , electrical engineering , medicine , alternative medicine , pathology
Supporting circular polarisation in single‐layer, single‐feed, compact patch antennas is a challenging task, especially when improved bandwidths are required. The difficulty lies in simultaneously obtaining good axial ratio (AR) and impedance matching performance over the required bandwidth. Several broadband,thick‐substrate circularly polarised (CP) patch designs have appeared in the literature, but their complex fabrication might not be suitable for harsh environments requiring mechanical simplicity or for high‐frequency applications at X‐band or higher. In this study, the authors propose a novel solution to this problem: the CP half E‐shaped patch antenna. This antenna is able to utilise thick substrates to meet the bandwidth requirements of many potential applications. Furthermore, the design can be fabricated on a single‐layer and uses reasonably sized gaps and line widths, making for a fabrication‐friendly design. Their design example shows 5.3% AR and impedance matching bandwidth at a thickness near a tenth of a wavelength. The S11 < − 10 dB bandwidth is 35%. Their particular design example has dimensions that fit within 45% × 39% of a free‐space wavelength. Furthermore, they provide an important comparison discussing the differences in operation between the linearly polarised half E‐shaped patch, CP E‐shaped patch, and CP half E‐shaped patch.