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Updated: Jun 27, 2026

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar
07:14

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Published on: May 1, 2018

Broadband Circularly Polarized Antenna Array with Sequential Rotation Feeding and a Windmill-Shaped Defected Ground

Shiquan Zhang1, Shuaijie Wu2, Xianqiong Wen1

  • 1School of Intelligent Science and Engineering, Xi'an Peihua University, Xi'an 710125, China.

Micromachines
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a new circularly polarized array antenna for wireless local area network (WLAN) applications. The antenna offers high gain and wide bandwidth, significantly improving data transmission in complex environments.

Keywords:
array antennacircular polarizationcommunication testdefected ground structurepacket loss ratesequential rotation

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Area of Science:

  • Electrical Engineering
  • Antenna Theory and Design
  • Wireless Communications

Background:

  • Wireless Local Area Network (WLAN) systems require antennas with high gain, wide bandwidth, and stable circularly polarized (CP) radiation.
  • Existing antenna solutions may not fully meet these demanding requirements for modern wireless applications.

Purpose of the Study:

  • To propose and implement a broadband circularly polarized array antenna for the 2.4-2.484 GHz ISM band.
  • To enhance antenna performance in terms of gain, bandwidth, and polarization stability for WLAN applications.

Main Methods:

  • Design of a coplanar waveguide fed broadband CP monopole antenna as the radiating element.
  • Utilization of a sequential rotation technique to create a four-element array.
  • Introduction of a windmill-shaped defected ground structure to extend bandwidth.

Main Results:

  • Achieved -10 dB impedance bandwidth of 1.22-2.78 GHz (87.1% relative bandwidth).
  • Obtained 3-dB axial ratio bandwidth of 1.85-2.66 GHz (35.0% relative bandwidth).
  • Measured peak gain of 8.2 dBic with left-hand circular polarization at 2.45 GHz and cross-polarization discrimination better than 20 dB.

Conclusions:

  • The proposed array antenna demonstrates a robust solution for WLAN access points and Internet of Things gateways.
  • The antenna exhibits wide bandwidth, high gain, and strong anti-interference capabilities, outperforming traditional linear-polarized antennas in multipath environments.