Improved Isolation Between Ports of MultiMode Antenna with a Reconfigurable Pattern by Decoupling Network

Tonga M., Alatan L., Civi O. A.

17th European Conference on Antennas and Propagation, EuCAP 2023, Florence, Italy, 26 - 31 March 2023, (Full Text) identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.23919/eucap57121.2023.10133487
  • City: Florence
  • Country: Italy
  • Keywords: decoupling network, gain improvement, isolation enhancement, pattern reconfigurable antenna
  • Middle East Technical University Affiliated: Yes

Abstract

In this study, a decoupling network is designed and implemented to a concentric circular patch with a ring antenna whose two ports are strongly coupled. The ports of the antenna are excited with phase differences to have different radiation modes at same frequency for pattern diversity. Strong coupling between the ports is inevitable and a decoupling network consisting of a lumped element is inserted between the ports to improve the isolation. With inductive and capacitive decoupling network designs, the ports of the antenna are decoupled. Lower than -20 dB isolation (|S21|) is achieved which improves active |S11| substantially. As a result, realized gain values of the antenna are increased by 2-3 dB.