A compact branch-line coupler design using low-pass resonators and meandered lines open stubs

branch-line microstrip coupler is designed and fabricated in this paper. The proposed coupler operates at 3 GHz, which is suitable for WiMAX applications. The designed coupler has a high performance, that is, a low phase difference of 0.49°, low insertion loss, good coupling factor, and good isolation better than −30 dB. Another advantage of the designed coupler is its novel geometrical structure based on integrating the semi-circular and step impedance cells. The design process is based on introducing and analyzing an equivalent LC model to improve impedance matching and reduce losses. To verify the design process, the designed coupler is fabricated, where a good agreement between the simulation result and measurement is achieved.

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Design of a miniaturized branch line microstrip coupler with a simple structure using artificial neural network

Roshani

Azizian

Jamshidi

et al. 2022

Frequenz

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In this paper, a compact branch microstrip coupler with the simple structure using T-shaped resonators and open-ended stubs at 1.8 GHz is designed and fabricated. The proposed coupler creates two transmission zeros at 3.4 and 3.87 GHz, with more than 50 dB attenuation level, which resulted in a good harmonic suppression at 2nd harmonic. Artificial neural network (ANN) has been utilized to extract the transfer function of the proposed coupler resonator for the first time, so the values of the transmission zeros can be located in the desired frequency. This technique can also be used for the other electrical devices. The designed device has a small size of 28 mm × 30 mm (0.9 λ × 0.95 λ), which shows more than 35% size reduction compared to the typical branch-line coupler with λ/4 branch lines. The proposed coupler is simulated using Advanced Design System (ADS) software and fabricated on Rogers Duroid 5880 substrate (ε r = 2.2, h = 31 mil). The simulation and measurement results verify the correct performance of the designed coupler.

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A compact branch-line coupler design using low-pass resonators and meandered lines open stubs

Cited by 3 publications

References 10 publications

Branch Line Couplers Demystified: A Comprehensive Overview

Branch Line Couplers Demystified: A Comprehensive Overview

Design of a Branch-line Microstrip Coupler Using Spirals and Step Impedance Cells for WiMAX Applications

Design of a miniaturized branch line microstrip coupler with a simple structure using artificial neural network

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