Perancangan dan Simulasi Matching Impedance Metode Single Stub dan Trafo 1/4 Lambda Menggunakan Smith Chart Tool

Abstract

Mathching impedance is an effort to adjust the antenna impedance value to the characteristic impedance of the channel. There are various mathching impedance techniques that can be used, including the λ/4 transformer and the use of stubs. In this paper, we discuss the design of an impedance adjuster using the λ/4 transformer method and the single stub method to improve the VSWR value and return loss in a microstrip antenna system. The design was carried out using a theoretical approach and using the Smith Chart Tool application. Based on the results of the λ/4 transformer design, the VSWR value was improved to 1.04 and the return loss became -35.04 dB. The results of the single stub design obtained an improvement in the VSWR value to 1.18 and the return loss value to -21.69 dB. Optimizing these two methods using the Smith Chart Tool application, an increase of 70% was obtained where VSWR became 1.