Design of Compact Branch Line Coupler

Abstract

The objective is to design a compact branch line coupler to operate at a 2.4GHz frequency. The branch line coupler focuses on -3dB power division with 900 phase difference. T-shaped structure is used to construct the compact branch line coupler. Conventional branch line coupler is also designed and counterfeit using ADS software along with the compact branch line coupler for comparison. The S-parameters for the both coupler are counterfeit and compared. The simulation results of compact branch line coupler had Better return loss, isolation, amplitude and phase difference are all accomplished. Using the proposed method 44% size reduction is achieved. Many microwave applications and integrated circuits, such as amplifier, phase shifters and balanced mixers use branch line couplers.

Design and Performance Analysis of a Tri-Band Coupler for RF Applications

“…The BLC is mainly designed for wireless applications, with a reduction in size and improved return loss [12]. The BLC is designed by substituting a T-shaped structure in the λ/4 transmission line [13].…”