Ewch i’r prif gynnwys
 Ehsan Azad

Ehsan Azad

Myfyriwr ymchwil, Ysgol Peirianneg

Room C/3.10, Adeiladau'r Frenhines-Adeilad Canolog, 5 The Parade, Ffordd Casnewydd, Caerdydd, CF24 3AA

Mae'r cynnwys hwn ar gael yn Saesneg yn unig.


I am pursuing a Ph.D. research degree at the Centre for High-Frequency Engineering (CHFE) in the School of Engineering. The purpose of my research is to overcome challenges encountered in the design of non-linear RF and microwave power amplifiers for current and emerging markets.

My peers and I competed in two student design competitions for High-Efficiency Power Amplifiers (HEPA). As a team, we were awarded second place in the 2022 RWW/ARFTG MTT-S HEPA Student Design Competition, Las Vegas, USA; and third place in the 2021 IMS HEPA Student Design Competition.



Diddordebau ymchwil

My research interests include the design, modelling, and characterization of nonlinear RF and microwave transistors and power amplifier circuits.

As part of my Ph.D. research, I am working with Ampleon Netherlands B.V on the design of highly efficient power amplifiers that can operate at multiple DC supply voltages. The design is based on the latest generation of gallium nitride (GaN) high electron mobility transistors (HEMTs) for sub-6 GHz 5G base stations.  

Cardiff's nonlinear behavioural model is crucial to the design process since it allows us to use the nonlinear pull-load measurement data directly within the CAD simulator. This increases the possibility of a successful first-pass design.

A new mathematical formulation for the Cardiff model has been developed, which can predict the device behaviours at various DC supply voltages. Multiple peer-reviewed scientific papers have been published as a result of this accomplishment.



I have more than 250 hours of experience as a lab demonstrator and teaching assistant in both undergraduate and postgraduate ectrical and electronic enginieering Modules. The modules which I have participated in are listed as below:

  • MSc: Microwave and Millimetre-Wave Integrated Circuit Design and Technology.

  • MSc: RF circuit design & CAD.

  • Year one: Electrical and electronic engineering lab.

  • Year one: Analogue and digital communication systems.

  • Year one: Matlab surgery.

  • Year one: Electrical and Electronic Engineering 1.

Traethawd ymchwil

Efficiency Improvement in Base Station Power Amplifiers

Ffynhonnell ariannu

Ampleon Netherlands B.V.


Roberto Quaglia

Dr Roberto Quaglia

Research Associate

Dr James Bell

Dr James Bell

Lecturer - Teaching and Research