Abstract
A low-profile microstrip patch antenna with widened bandwidth and beamwidth is proposed for the wireless communication systems. To widen the half-power-beamwidth (HPBW), four folded metal rings are symmetrically introduced around the microstrip patch antenna, which can also realize dual-band operation and a wider impedance bandwidth (IBW) of the patch simultaneously. The proposed antenna is simulated and obtained through a commercial electromagnetic simulation software ANSYS HFSS <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">®</sup> . The simulated results show that, the HPBWs in H-plane (φ = 90°) at lower resonance (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> = 1.535 GHz) is broadened from 100° to 130° and obtained HPBW at higher resonance (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</sub> = 1.72 GHz) is 154° in the H-plane. Additionally, the IBW at f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> is widened from 1% to 5% and the obtained one at f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">H</sub> is 2.9%. Finally, the proposed antenna design with satisfactory performance is realized in an overall dimensions of 70 mm × 70 mm × 15.6 mm, whose electrical size is 0.38λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.38λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × 0.08 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">λ0</sub> (λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> is the free-space wavelength at the center frequency f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> = 1.625 GHz.
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