Abstract
In this paper, a microstrip-fed broadband circularly polarized (CP) slot antenna is presented. CP operation can be attained simply by embedding an S-shaped strip. By loading with a multiple-circular-sector patch, which consists of 12 circular-sector patches with identical central angles of 30° and different radii, the 3 dB axial ratio (AR) bandwidth is significantly broadened. To validate the performance of the proposed antenna, an antenna prototype is fabricated and tested. The fabricated antenna is 54 mm × 54 mm × 0.8 mm in size. The measured −10 dB reflection and 3 dB AR bandwidths are 81.06% (1.68–3.97 GHz) and 70.55% (1.89–3.95 GHz), respectively. Within the 3 dB AR bandwidth, the measured peak gain is 3.81 dBic. Reasonable agreement is also obtained between the measured and simulated results.
Highlights
Microwave imaging is a promising technique for various applications, such as security, non-destructive testing and evaluation, medical imaging, and through wall imaging
With the well-known advantages of a wide bandwidth and low-cost manufacturing, the printed slot antenna has become a promising candidate for circularly polarized (CP) antenna designs, where enhanced 3 dB axial ratio bandwidths (ARBWs) are needed
We propose the design of a microstrip-fed broadband CP slot antenna
Summary
Microwave imaging is a promising technique for various applications, such as security, non-destructive testing and evaluation, medical imaging, and through wall imaging. Two orthogonal modes with equal amplitudes and 90◦ phase difference should be excited For slot antennas, this can be realized by adding perturbation structures to the feed line and slot. In another study [7], a circular CPW-fed CP slot antenna with a 3 dB ARBW of 36.01% was realized by having a T-shaped metallic strip protrude from the ground plane towards the slot center. A microstrip-fed ring slot antenna with a pair of grounded hat-shaped patches was introduced [13], reportedly showing a wide 3 dB ARBW of 56.79%. In another study [14], a CP slot antenna design with a 3 dB ARBW of 57.43% was realized by using a multiple-circular-sector slot. Details of the antenna design and the experimental results are presented and discussed
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