Design of decoupling and matching networks between two ports of a multiport antenna

Date

2024-11

Author

Gültekin Aydın, Elif Damla

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It is essential to design a reconfigurable antenna that can be utilized for multiple purposes. In this thesis, the decoupling and matching networks for a pattern reconfigurable antenna to eliminate mutual coupling between its two ports are analyzed and presented. The pattern reconfigurability is achieved by providing in-phase and out-of-phase feedings for the antenna’s ports. Theoretical calculations in MATLAB, and HFSS/AWR simulations have been carried out for design and analysis purposes. In order to suppress the coupling, first, a transmission line based decoupling and matching network (DMN) is integrated. It sustains improved isolation between the two ports of the antenna. However, the impedance matching condition of each port is destroyed and could not be achieved at the desired level and bandwidth. Then, a systematic DMN design which involves lumped and distributed elements, is applied to the reconfigurable antenna. This antenna has been produced and according to the measurement results, it has been seen that by modifying and implementing the DMN method used to decouple array antennas to multiport pattern reconfigurable antenna, a significant isolation is achieved between the ports while maintaining wide band impedance matching for each port. However, the desired radiation patterns could not be maintained by providing the desired decoupling and matching conditions. A cascaded network analysis to obtain the required coefficients for adjusting magnitudes and phases of the ports, so as, to provide the required magnitudes and phase differences between the antenna’s feeding ports to obtain broadside and conical beams with desired radiation levels, should be realized.

Subject Keywords

Wireless communication, Multiport antenna, Pattern reconfigurable antenna, Decoupling network, Matching network

URI

https://hdl.handle.net/11511/112930

Collections

Graduate School of Natural and Applied Sciences, Thesis