Abstract
A compact wideband circularly polarized (CP) microstrip slot antenna (MSA) with parasitic elements is designed in this letter. The CP MSA comprises a square-loop sequential-phase (SP) feeding configuration, four rotated rectangular patches, and four L-shaped slots embedded in the ground plane. The square-loop SP feeding structure comprises a square loop and an arc-shaped strip, which could provide a 270° phase difference. Four rotated rectangular patches are placed at the edge of the square-loop feeding configuration using a capacitively tightly coupled feeding method to stimulate the CP resonant mode. After selecting these elements and tuning proper dimensions, the broad operating bandwidths of 4.38–5.25 GHz (18%) for |S11| <–10 dB and 4.65–5.31 GHz (13.2%) for AR <3 dB could be realized. Hence, the designed CP MSA has a potential application value in wireless communication.
Highlights
Because of the obvious merits, antenna arrays have been massively used in wireless communication systems
Is study develops a new scheme of the circular polarization (CP) microstrip slot antenna (MSA) with 2 × 2 array and low-profile characteristics. e proposed CP MSA comprises a square-loop sequential phase (SP) feed-network, four rotated rectangular patches, and four L-shaped slots embedded in the ground plane. e squareloop SP feed-network is composed of a square loop and an arc-shaped strip, which could provide a 270° phase difference
Four rotated rectangular patches are placed at the edge of the square-loop feeding configuration using a capacitively tightly coupled feeding method to stimulate a CP resonant mode
Summary
Because of the obvious merits, antenna arrays have been massively used in wireless communication systems. Two T-junction power dividers are joined as a sequential phase (SP) shifting feeding network in [5], two phase-shifted swaps and a 1 : 8 power divider are combined as stripline feeding network in [6], and Wilkinson power combiners and delay lines are used as a beamforming network in [7] Among these feeding strategies, the SP feeding network is one of the potential candidates in the design of antenna arrays, which could excite a stable and SP difference to the port of the feedline. Four rotated rectangular patches are placed at the edge of the square-loop feeding configuration using a capacitively tightly coupled feeding method to stimulate a CP resonant mode After selecting these elements and tuning proper dimensions, broad operating bandwidths of 4.38–5.25 GHz (18%) for |S11| < −10 dB and 4.65–5.31 GHz (13.2%) for AR < 3 dB could be realized
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