Design and Analysis of a Broadband Microwave Amplifier

Obinna Okoyeigbo,Ayobami Olajube,Onyinyechi Steve-Essi,Olamilekan Shobayo,Tobiloba Somefun,Augustus E Ibhaze

doi:10.11591/ijeei.v9i1.2708

Abstract

This paper presents the procedures involved in the design and analysis of a microstrip broadband microwave amplifier. For system design, simulation, optimization and analysis, a Computer Aided Design (CAD) tool know as Agilent Advanced Design System (ADS) was employed. The amplifier device- FLC317MG-4 FET, was tested for stability, and was observed to be unconditionally stable between 2 to 6 GHz frequency band. Two possible ideal matching circuits were investigated to identify the best matching circuit with the maximum transducer power gain. It was observed that the quarter-wave transformer with parallel open circuit stub, gave a high gain at a wider range of frequency (larger bandwidth/ broadband), than the other matching circuit. Hence, it was employed for the broadband amplifier design using microstrips, and achieved a maximum flat gain of about 9.8 dB to 10.118 dB, at a bandwidth of 3.5 to 4.5 GHz.

Highlights

The evolution of wireless communication has provided numerous applications for RF and microwave amplifiers
Broadband amplifiers amplify over a wide range of frequency, without significant losses within the passband
This paper looks at the design of a microstrip broadband amplifier, at a microwave frequency range of 3.5 to 4.5 GHz, using Agilent Advanced Design System (ADS) (Advance Design System)

Summary

Introduction

The evolution of wireless communication has provided numerous applications for RF and microwave amplifiers. Amplifiers are devices that increase the output power of signals. Various categories of RF/ microwave amplifiers exists They include broadband, narrowband, variable gain, buffer, low-noise, and high-efficiency amplifiers etc. Broadband amplifiers amplify over a wide range of frequency, without significant losses within the passband. Broadband amplifiers, which have good matching properties, high power output, broad/wide bandwidth and low nonlinear distortion, are among the most widely used amplifier type in wireless communications [2]. Broadband amplifiers provide a number of other advantages. They do not require resonant circuit tuning, and it is possible to transmit a wide multimode signal spectrum or to achieve fast frequency agility [3]

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Conclusion