Armms RF and Microwave Society
Book for the Apr 2017 conference »


Next Conference:

Monday 3rd April to Tuesday 4th April 2017 at The Oxford Belfry, Nr Thame

Bookings for the April 2017 meeting are now open. The meeting returns to Oxfordshire, commencing with lunch at 12.30pm on the Monday and will finish at around 3:30pm on the Tuesday.

Young Engineer Sponsorship: The ARMMS RF & Microwave Society offers sponsorship to young engineers (28 or below) who have papers accepted for presentation. Sponsorship is £100 cash plus free attendance (including conference dinner and overnight accommodation). Potential candidates should identify themselves as eligible at time of submission and state their date of birth. This offer is limited to a maximum of 2 places per meeting.

Best Paper Award: The Steve Evans-Pughe prize is awarded to the best presenter at each meeting. The award is £200 for the best paper and £50 for the runner-up. The prize is sponsored by AWR.

If you are interested in submitting a paper for presentation at this conference, please contact the technical coordinator (details below). Papers currently listed below are those already accepted. The deadline for submissions is March 15th. For all other enquiries please email


The Oxford Belfry
Milton Common
Nr Thame

Tel01844 279 381


David Hand
Northrop Grumman
Park Air Systems Ltd


3D Printed Waveguides: A Revolution in Low Volume Manufacturing for the 21st Century

William Otter
Imperial College London

3D printing is a disruptive technology, offering the inherent capabilities for creating truly arbitrary 3D structures, with low manufacturing costs associated with low volume production runs. This paper provides an overview of the current progress in 3D printing of metal-pipe rectangular waveguide (MPRWG) components, from 10 GHz to 1 THz, at Imperial College London. First, measurements performed at the UK National Physical Laboratory demonstrate that 3D printed MPRWG performance is comparable to standard commercial waveguides at X-band and W-band. Then, a fully 3D printed X-band dielectric flap tuneable phase shifter and W-band 6th-order inductive iris bandpass filter are demonstrated experimentally. Finally, an optically-controlled 500 GHz IQ vector modulator will also be presented; packaged laser diodes and high resistivity silicon implants are integrated within a hybrid 3D printed split-block module, representing a paradigm shift in additive manufacturing for realizing tuneable THz applications.

A 2.5 W LDMOS Microwave Totem-Pole Push-Pull RF Power Amplifier

Gavin Watkins
Toshiba Research Europe Ltd

RF push-pull power amplifiers (PA) typically use a transformer or balun at the output to combine the two anti-phase signals. The push-pull PA described here does not, instead using a totem-pole output stage consisting of two N-channel FETs; a source-follower to supply current to a 50Ω load, and a common-source amplifier to sink current. The source tab of the source-follower cannot be grounded to dissipate heat in the normal way, so a ceramic spacer transfers the heat to an aluminium heatsink.

A prototype PA was designed for 700 MHz. Under continuous wave (CW) excitation, it achieved a 1 dB compression point (P1dB) of 33.9 dBm (2.46 W) at an efficiency of 46.5%. The second harmonic distortion (HD2) suppression was 43.6 dB relative to the fundamental. These results indicate that the PA was operating in a push-pull mode.”

Convergence of Simulation and Measurement Worlds in the Modern Era

Alistair Wingfield
CST AG - Computer Simulation Technology

In today’s era, EM simulation is now part and parcel of the product lifecycle management for many manufactured electrical/electronic goods. For most application requirements, regardless of electrical size, there exists a numerical technique that aids in the development, design and certification. In some cases a single solver is not adequate and a combination of different numerical techniques can be employed to a problem to obtain an optimised goal. However the key question is still the same after more than 25 years of simulation development regardless of the design at hand:

“Will my simulation be accurate enough and have good correlation with the expected measurements/ outcome?”

This paper looks at a couple of diverse examples where simulation and measurements have converged in an increasingly complex and sophisticated world, and some of the considerations required. It also looks at how the ethos of the simulation models has adapted to modern management.

High Level Synthesis for 5G Applications

Dr Saket Srivastava
University of Lincoln

High Power GaN Amplifier for High Efficiency

Avtar Virdee
Microwave Technology

Applications design and measured results of a single stage S-Band high-efficiency GaN-HEMT power amplifier are presented for continuous wave (CW) applications. The power amplifier employs a Class‑F harmonic processing technique to shape the current and voltage waveforms to enhance the amplifier’s efficiency performance. The GaN-HEMT device constituting the amplifier is a commercial off-the-shelf device that is designed for high voltage operation. The fabricated GaN-HEMT power amplifier operating under continuous wave mode achieved a nominal gain of 18 dB with an output power of 130 Watts, a drain efficiency of 73%, and power-added efficiency (PAE) of 64% across 2.35 to 2.55 GHz.

Integrated Multi-Role Microwave Antennas and Passive Circuits

Dr Yi Wang
University of Greenwich

This talk will discuss a relatively new microwave device concept - the so-called ‘multi-role device’ where multiple circuit functions are combined and integrated in one component. It will focus on two topics that have been in the research front in the past few years: integrated filtering antennas and multi-port filtering networks.

Laboratory Scale Equipment for Microwave Pyrolysis of Waste Petrochemical Based Products

John McGreevy

Linearisation of RF Front Ends

Gareth Lloyd
Rohde and Schwarz

Linearization, as a concept for improving signal integrity in radios, has been around for the best part of 100 years (at least dating back to Black's Feedforward patent, filed in 1925). A golden period of innovation followed for 80 years, until the turn of the century, when the now quasi-ubiquitous DPD (digital pre-distortion) became the architecture of choice. It was adopted widely, no more so than in Mobile Communications. As a result, the subject matter has become somewhat neglected. This paper is intended to provide a broad grounding, introduction and refresher to the subject matter. To include the proposal of a classification system, a review of some key methods along with a statement of the limits and goals of linearization.

Low Phase Noise Signal Sources for Radar and Instrumentation

Dr Stuart Feeney
SMF Designs Ltd

This paper describes the implementation of signal sources within the range 70 MHz to 7 GHz with very low in-band phase noise using combinations of direct, phase-locked and digital synthesis techniques.

Passive Retro-Reflectors for Radar Earth Observation

Ivor Morrow
Cranfield University

Reconfigurable Hardware Design for Satellite Controllers

Adam Taylor
Lincoln DSP Ltd

The Digital IFM Revisited

S. V. Potter

Naval Electronic Warfare receivers have evolved greatly since the beginning of World War 2. As WW2 progressed, the capability and size of the combatants created a need for more sophisticated EW Systems; greater sensitivity, better selectivity and better identification of signal sources were called for. The situation is much the same now. Today, signal density can be a problem and certain types of signal can significantly degrade receiver performance.

This paper identifies some of the shortcomings of the older type of IFM in a modern environment and suggests a way in which a phased array based receiver can achieve simultaneous measurement of RF frequency and angle of arrival. Each element of the array feeds a phase discriminator. Highly redundant processing is employed to ensure the discriminators track correctly in the presence of significant manufacturing errors and receiver noise.

The Trouble with Oscilloscope Probes

Mark Ashcroft

The low cost hand-held oscilloscope probe has changed very little in the last three or four decades, arguably it has “lost touch” with its applications as signals have become faster, smaller and more prone to the invasive nature of their measurement.  This paper reviews the rapidly growing scale of the problem and proposes a more appropriate design approach to achieve a microwave and Gigabit test probe.

Two Port Gain and Stability

Dave Andrews

Very High Efficiency High Power Schottky Diode Frequency Doubler Operating at 180-190 GHz

Tomasz Waliwander
Farran Technology

This paper presents simulation and preliminary test data for a fixed-tuned ultra-high efficiency high power Schottky diode 180-190 GHz frequency doubler. The device is based on a circuit topology presented originally by Erickson and further modified by Porterfield. In this configuration, the Schottky diodes are placed in anti-series configuration at the junction between the balanced and unbalanced sections of the circuit. It is designed to only respond to odd harmonics at the input and even harmonics at the output. The EM mode orthogonality ensures very good input and output signal isolation without a need for additional filtering elements. E-plane split block metalwork design and photolithographic techniques are used to produce circuit interfaces, cavity and matching networks.

The doubler was designed for input power of 100-200 mW and was tested to produce peak flange-to-flange efficiency of 39.5% and output power of 40.7 mW at 186 GHz and 3dB bandwidth of more than 10%. According to the author’s knowledge, these results exceed the current state of the art at the given frequency, output power and efficiency point. Further test are ongoing.


Companies booking two or more delegate places are able to take part in the commercial exhibition that accompanies the conference. Please note: there is a maximum of 20 exhibition tables at each meeting, these are offered on a first come basis. Booking two delegate places does not guarantee an exhibition space, please email to check availability and reserve and exhibition space.


The Society would like to thank Saras Technology for sponsoring the April 2017 meeting:


Contributions are invited with an emphasis on RF and microwave design, research, testing and associated subjects. An oral presentation will be made at the meeting and a written paper will be required for publication in the society digest, which is distributed to delegates at the meeting. Prospective speakers are requested to submit a title and a short abstract to the technical coordinator (see above) as soon as possible.

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