Dielectric Resonator Antenna E field absolute open cavity 1.8 GHz

Video animation of the absolute value of the electric field at 1.8 GHz of a cylindrical DRA placed within an open metallic cavity.

Thanks for coming in!

Hello and welcome to my updated website focused on the design and analysis of RF and microwave devices including antennas, filters, transmission lines, cavities, resonators, waveguides, etc. In addition some general topics about EM Radiation are discussed too. All material presented in this website was done during my PhD thesis. I am proud that I can share this here with you and I hope you enjoy reading. RF engineering is a 'tough' area, but it is also beautiful and mysterious. I will never forget when I was experimenting with receivers from my school age: I was thrilled with how antennas and wireless signals could propagate!

The website aims to explain the practical concepts of operation underlying these structures using graphs and illustrations, rather than providing blurred explanations using complex mathematical equations. This is believed to be the best way for someone to engage quickly into the field of RF and microwave engineering. Later on, this helps to grasp maths related with microwaves much easier when studying in greater detail.

If there is any topic that you can't find here and you would like to see it presented, please mention it on the feedback form.

Major articles recently added (done!)



(above: internal surface current of a single combline cavity filter for the first mode. Top cover has been removed to view internal space. Cylindrical resonator is metallic, including cavity walls. Bottom of resonator is attached with the cavity bottom wall)

Articles planned to appear (to be done!)

two cavities 2nd order combline filter for 1800 MHz

(above: 2nd order combline filter with inductive aperture coupling. On top of each resonator tuning screws are shown. Each cavity has a size of 50mm x 50mm x 30mm. The structure is surrounded by PEC walls. The structure resonates near 1800 MHz)

(see below a video-teaser of the 3-D absolute value of the electric field for a rectangular microstrip patch antenna fed with a microstrip line. The antenna operates at 587 MHz. Also, shown is the perspective view of the antenna. The inset termination of the microstrip line provides impedance matching with the antenna close to 50 Ohms).

microstrip antenna patch video field electric absolute

rectangular microstrip patch antenna

500 MHz RF Class A amplifier circuit schematic

(seen above: 500 MHz Class-A RF power amplifier with input and output matching networks for maximum gain. Bias network is not shown, but the transistor is biased at Vce=+5Vdc with Ic=100mA.)


stepped impedance microstrip printer filter 900MHz

(seen above: Equivalent Distributed Network of a Stepped Impedance PCB Filter (both transmission line sections and effect of stepped impedance sections are shown). Corresponding lumped circuit is also shown (top right).)

Welcome message

Thank you for visiting this website, wherever you are on this planet!

This is my personal website discussing Antennas and RF Engineering Design topics. The articles presented here are stimulated from ideas and knowledge acquired during my Ph. D research, at Essex University, UK, in the field of antenna and electromagnetics theory.

The material presented in this website discusses and presents the electromagnetic theory, the mode excitation, the radiation patterns, the possible feeding and excitation schemes of various antennas geometries. Other topics such as RF circuit design of filters, amplifiers and so on are also discussed.

Personal Note

Every care has been taken to make sure that the material presented on this website is as accurate as possible. However, mistakes can always happen! So, use any of the information presented here at your own risk. Use your mind and your common sense to handle with the best way the material on this website!

I do not sell, I do not trade and I have no profit whatsoever with any of the material seen on this website. I write the articles to share around for free with each one of you. My passion about antenna engineering is my motivation, despite spending significant time outside my full time job to prepare all the material presented here.

You can use the material on the website as you like, but please reference your sources in your reports -this makes everyone's work fair and it is great to let people know who the actual contributor is! I would like to hear from you any thoughts, comments or any corrections that are spotted here and there (actually the more I read the articles I've prepared, the more I realise that there are ways to improve them)!