Development of Tunable Balanced Couplers in Balanced Antennas

To address the growing demands of diverse communication needs, microwave integrated circuits must support more functions, leading to increasingly complex microwave circuits. However, designing these complex circuits leads to inevitable issues of signal crosstalk and common-mode (CM) noise. To combat these problems, balanced-port circuits are preferred due to their superior ability to suppress signal crosstalk and common-mode noise compared to traditional single-port circuits. This paper summarizes the development status of tunable balanced couplers based on completed work.