Abstract
In this paper, a novel wideband circularly polarized (CP) millimeter wave (mmWave) microstrip antenna is presented. The proposed antenna consists of a central patch and a microstrip line radiator. The CP radiation is achieved by loading a rectangular slot on the ground plane. To improve the 3-dB axial ratio bandwidth (ARBW), two symmetric parasitic rectangular patches paralleled to a central patch and a slit positioned to the right of the central patch are loaded. To verify this design, the proposed antenna is fabricated with a small antenna of 2.88 × 3.32 × 0.508 mm3. The measured impedance bandwidth (IMBW) for S11<−10 dB of the proposed antenna is 35.97% (22.8 to 33.8 GHz). Meanwhile, the simulation result shows that the 3-dB ARBW is 15.19% (28.77 to 33.5 GHz) within impedance bandwidth, and the peak gain is from 5.08 to 5.22 dBic within 3-dB ARBW. The proposed antenna is suitable for CP applications in the Ka-band.
Highlights
With the rapid development of the 5th generation (5G) wireless communication, circularly polarized (CP) antennas have received increasing attention because they can overcome multipath interferences, polarization mismatch, and Faraday rotation effects [1,2,3,4,5]
Patch antennas with parasitic strips and ring patches are presented for wideband circular polarization [6, 7]. rough protruding a horizontal stub from the ground plane, the 3-dB axial ratio bandwidth (ARBW) is enhanced [8]
To enhance bandwidth of proposed antenna, two symmetric parasitic rectangular patches are loaded, which are parallel to the central patch, and a slit is loaded to the right of the central patch
Summary
With the rapid development of the 5th generation (5G) wireless communication, circularly polarized (CP) antennas have received increasing attention because they can overcome multipath interferences, polarization mismatch, and Faraday rotation effects [1,2,3,4,5]. To enhance bandwidth of proposed antenna, two symmetric parasitic rectangular patches are loaded, which are parallel to the central patch, and a slit is loaded to the right of the central patch. Wide ARBW is achieved by loading two symmetric parasitic rectangular patches paralleled to the central patch in ANT., and it is shown from Figure 4 that the 3-dB ARBW is from 2.2 to 3.1 GHz. e ARBW is further enhanced by loading a small slit positioned to the right of the central patch in ANT.. In order to clearly understand the design rules of the proposed antenna, a set of parameters, including the change in the width of rectangular slots on the patch (w22), the length of the slit (w23), and the feeding position (w25), will be discussed . Based on the optimized parameters, the antenna is Figure 11: Effects of various w25 on AR
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