A comprehensive modeling approach is applied to the study of pHEMT transistors for microwave power amplifier applications. This approach combines physical, electromagnetic and thermal simulations to model large power transistors used in these applications, allowing both the individual finger contribution and the global performance to be investigated in an efficient manner, which can be used wit...

This paper features a radical and highly accurate method of designing a microwave amplifier. A Full-wave Electromagnetic Simulator, which is based on the Methodof-Moments (MoM) numerical method, is used in parallel with the conventional microwave circuit simulator to demonstrate a superior performance outcome such as Stability, Return Loss and Small Signal Gain. This method known as EM/Circuit ...

13 watt Current Mode Class-D (CMCD) with 60% efficiency is presented. This amplifier is the highest power switch mode microwave power amplifier reported to date. The CMCD architecture is an improvement over the Voltage Mode Class-D in that the parasitic reactance in the active device can be absorbed into the tank circuit resulting in a zero voltage switching condition.

*Correspondence: [email protected] 2Nanostructure Physics, Royal Institute of Technology (KTH), Stockholm, Sweden Full list of author information is available at the end of the article Abstract A superconducting microwave resonator is modified with several weak links to make it nonlinear and operated as a phase-insensitive microwave amplifier. Signal gain is demonstrated by intermodulation with a...

A two-stage 500 kV 200-A ferroelectric electron gun has been designed, fabricated, tested, and used in a high power microwave amplifier experiment. We report on the operational characteristics of the gun including measurements of the beam dynamics. The optimum conditions for application of the trigger and its timing are also reported. Faraday cup measurement shows that the beam radius is 4.1 mm...

A high-efficiency class-E power amplifier is proposed for digital PWM microwave signal amplification in the improved Kahn Technique transceiver. The benefit of using a class-E power amplifier in this design approach is to improve efficiency of the power amplifier due to its switching mode operation, theoretically 100 % with ideal conditions. In this paper a class-E amplifier is designed for the...

This article deals with the nonlinear memory effects observed on both AM/AM and AM/PM conversions and swept frequency-separation two-tone intermodulation-distortion (IMD) tests made on microwave power-amplifier (PA) circuits. This study is theoretically introduced via an analytic Volterra series analysis, then complemented with large-signal harmonic balance and envelope simulations of a GaN HEM...

Design and experimental results are presented from two high power microwave generation experiments utilizing a high repetition rate induction linac generated electron beam. A relativistic klystron has generated more than 100 MW microwave pulses in X-band for 50 ns without pulse shortening or breakdown. Design studies for the first cyclotron autoresonance maser (CARM) amplifier using an inductio...

Deschamps’ theorem for n-terminal complementary structures is reviewed. An extension to Deschamps’ theorem for a class of three-terminal bounded structures with one axis of symmetry is presented. It is shown that, for these structures, a simple relationship between the impedances of the odd mode of the original structure and the admittances of the even mode of the complementary structure exists...