Miniaturized Single-Feed Cross-Aperture Coupled Circularly Polarized Microstrip Patch Antenna

Abstract

Abstract-A novel miniaturized single-feed cross-aperture coupled circularly polarized (CP) microstrip patch antenna loaded by four identical shorting strips is proposed and discussed. Each shorting strip underneath the edges of the radiating patch is connected to the ground plane via an array of three identical and equidistant shorting pins. With the assistance of the capacitance offered by the radiating patch and the shorting strips, and the inductance induced by the shorting pins, the patch size and overall size of the proposed antenna have been significantly reduced by 75% and 69%, respectively, compared with the conventional antenna. An antenna prototype with an overall size of 50 mm × 50 mm× 7.548 mm (0.317λ 0 × 0.317λ 0 × 0.048λ 0 ) and a patch size of 29.43 mm × 27.85 mm (0.186λ 0 × 0.176λ 0 ) has been fabricated and measured, which shows a measured 10-dB return loss bandwidth of 92 MHz (4.76%) from 1.886 to 1.978 GHz with a maximum right-handed CP (RHCP) gain of 4.9 dBic. The measured 3-dB axial ratio (AR) bandwidth is 28 MHz (1.46%) from 1.899 to 1.927 GHz with a 3-dB AR beamwidth of more than 140 • across the operating bandwidth.

Asymmetric and symmetric modified bow-tie slotted circular patch antennas for circular polarization

“…In [18], the radiating patch has a 10 dB RL bandwidth of 552 MHz, but it has a low 3 dB AR bandwidth. Other antennas [19][20][21][22] have lower AR and 10 dB RL bandwidths compared to the proposed ABT and SBT slotted patch antennas.…”

“…All the proposed four antennas possess wideband CP radiation characteristics with more than 5 dBic gain. Other antennas [19][20][21][22] The small deviations in practical results when compared to simulation results are attributed to fabrication tolerances, and are not considered in the process of simulation.…”

“…Various configurations, including the asymmetric Cshaped slot [17], asymmetric nature of complimentary slit ring resonator with circular slot [18], prefractal asymmetric boundaries [19], combination of parasitic strip and symmetrical corner V-shaped slits [20], integrated unequal circular elements at the corners of square patch [21], and cross-slotcoupled [22] patch antennas have been presented in the literature for CP radiation. Wideband CP antennas with significant gain are an important requirement in modern transceiver systems used for radar and navigational purposes.…”

Asymmetric Triangular Semi-Elliptic Slotted Patch Antennas for Wireless Applications

“…The performance comparison between the proposed designs and the other types of noble structures [20]- [24] pertaining to overall size, operating frequency range, 10dB return loss bandwidth, 3dB AR bandwidth and peak gain is presented in Tab…”

“…PIN diodes on the radiator [23] are used for polarization diversity, which is either Linearly Polarized (LP), left or right circularly polarized at each port. A CP radiated cross aperture coupled compact antenna [24] is reported with shorting strips and pins to reduce the overall dimensions of the radiator compared to the conventional antenna.…”