Design of a Microstrip Balanced Amplifier Using the Wilkinson Power Divider

Abstract

The broadband bandwidth of power amplifiers is one of the most important features that restrict its wide usage. This work presents a new structure of a broadband power amplifier suitable for ISM band. The proposed amplifier, which is realized with two identical single-stage amplifiers and two power dividers on low loss Epoxy (FR4) substrate with a substrate thickness of 1.6mm and a relative permittivity equal to 4.4. The proposed PA demonstrates a power gain of 16 dB at 2.45GHz. The input and output matching impedances are better than -15dB throughout the band. the power amplifier delivers a maximum output power equal to 16dBm with a flat gain varied between 15-16dB.

An Enhanced Design of Cascaded Single-Stage Distributed Amplifiers Utilizing Quasi-Differential Amplifier Cells

“…Although the most important determinant of gain and bandwidth in microwave and RF amplifiers are transistor technology, and the product of gain in bandwidth (GBP) is constant, the physical environment of the transistors (design) affects and limits the practical gain and bandwidth of amplifiers [9]. The old design methods of broadband amplifiers such as compensator amplifiers, feedback amplifiers, and balanced amplifiers generally do not match the high GBP requirement, but the Distributed Amplifier (DA) is the most important microwave amplifier that can reach high values of GBP [10,11]. The transmission cable limits the amplifier's bandwidth of the gate and drain circuits, which is a major difficulty in DA theory [12].…”