RF Waveguide Filter Turning Method Using Simulated Annealing Optimization Technique

This study investigates the simulated annealing optimization algorithm for tuning a 5th order elliptic RF waveguide filter in wireless communication systems. The filter operates in the frequency range of 0.4 to 1.6 GHz with a center frequency of 1 GHz and a bandwidth of 200 MHz. It is designed as a bandpass filter with transmission zeros, intended to selectively pass desired frequencies while attenuating unwanted signals. The optimization process effectively transitions the filter from an untuned to a tuned condition, meeting stringent performance requirements. Through adjustments to the filter's S-parameter, signal integrity is enhanced, with effective passage of desired frequencies and attenuation of unwanted signals. The findings validate the efficacy of simulated annealing optimization in addressing complex and nonlinear systems, underscoring its potential for enhancing RF filter performance and reliability in practical applications. This research emphasizes the value of advanced optimization techniques in meeting specific tuning requirements and supporting the evolving demands of wireless communication technologies.

I. Introduction

The RF filter is a critical component in wireless communication systems. It functions to pass the required band and reduce interference on both transmitted and received frequency. Especially, the RF waveguide filter has a metal cavity structure inside. This structure has the characteristic of minimizing insertion loss in the high frequency band. However, due to tolerances and material property variations, this structure can't satisfy the desired performance even with precise manufacturing processes. Therefore, post- manufacturing tuning process is necessary.