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Armms RF and Microwave Society
Book for the Apr 2019 conference »


Monday 1st April to Tuesday 2nd April 2019 at Double Tree by Hilton Oxford Belfry, Thame

Young Engineer Sponsorship: The ARMMS RF & Microwave Society provides sponsorship for young engineers (28 or below) who have had papers accepted for presentation at each meeting. Sponsorship is £200 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 NI.

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 February 15th. For all other enquiries please email


Double Tree by Hilton Oxford Belfry



Kara (Mehmet Karaaslan)
Technical Specialist
Teledyne e2v

Tel+44 (0) 7801 723 751


5G Base Station Antenna Design

Mustafa Pehlivan, Yavuz Asci, and Korkut Yegin
Ege University

Base station antenna requirements for 5G demand high gain, wide beamwidth and low reflection coefficient antenna structures. A slot-fed waveguide antenna with stepped opening is proposed to satisfy all these requirements. The design and simulations of the antenna are carried out in CST Microwave Studio and impedance bandwidth (RL< -15 dB) and element gain greater than 14 dBi are obtained. The structure, although inspired from open-ended waveguide, exhibits low gain variation and stable beamwidth over 24.5 GHz to 28.5 GHz. The antenna has dual linear slant polarizations with +45° and -45°. Theoretical analysis, simulation details and prototype measurements will be provided.

A coherent, multichannel signal generator for a 5G mmWave antenna test-bed

Tim Masson
Keysight Technologies

The paper will describe the design (a bit) and implementation (a bit more) of a 2-channel generator based on up-conversion of a directly synthesized IF.   By taking a totally different approach we were able to deliver a system that met the basic requirements for the target system at significantly lower cost than using the obvious IQ Baseband – Vector Generator combination. Nothing come for free – so I will touch on some of the trade-offs of this approach, and some possible enhancements, should we do another similar system in future.

A Fully Integrated 3.5GHz Single chip GaN Doherty PA for sub-6GHz 5G

Robert Smith
Plextek RFI

The presentation will describe a fully integrated Doherty MMIC for the 3.5GHz 5G band designed by Plextek RFI. The PA was fabricated on a 0.4µm gate length GaN-on-SiC process from GCS. The MMIC is packaged in a laminate SMT QFN. This presentation will outline the design, manufacture and evaluation of the PA and demonstrate good agreement between measurement and simulation.
The packaged MMIC was evaluated on a representative PCB. Measurements included evaluation using a 100MHz 5G NR signal at 3.5GHz. The packaged PA achieved a PSAT of 45dBm with a peak PAE of 50%. The PAE at 8dB power back-off was 31.5%. Using a 100MHz signal with 11.5dB PAPR the EVM was 3.5% and ACLR was less than -33dBc at an average power of 36dBm (4W). 

A GaAs SP8T Switch Design for E-Band Automotive Radar

Priya Shingal
Arralis Technologies

A GaAs Single Pole Eight Throw (SP8T) switch design, simulation and measured performance in a frequency range of 76-81 GHz is discussed. The switch is intended to be used in the RF-frontend design of an E-band FMCW automotive Radar system. UMS foundry’s Schottky diode process is used for the design and fabrication as it exhibits very low junction capacitance and series resistance for the diode. On-wafer measured insertion loss and isolation of the designed SP8T is <6 dB and >24.9 dB respectively from 76-81 GHz. On-wafer measured input and output return losses are >10 and 12 dB respectively both in open condition and when one switching arm is closed. The paper discusses the design technique for a multi-throw switch at such high frequencies where phase imbalance in the switching arms poses limitations. Use of a SP8T switch would reduce a number of transition losses as compared to if either SPDT or SP4T were used, specifically at such high frequencies. Assembly related costs and losses are also reduced due to the reduced number of chips being used. Hence, overall system performance is improved which is critical at such frequency range and for the application.

Ambient Radio Frequency Energy Harvesting - A Load of Hot Air?

Gavin Watkins
Toshiba Research

Ambient Radio Frequency (RF) Energy Harvesting (EH) is touted by some as a source of free energy for powering anything from Internet of Things (IoT) sensor nodes to charging mobile phones. Many start-ups have received significant funding pursuing this goal. To evaluate the feasibility of harvested RF power from radio transmissions, measurements were undertaken in Bristol, UK, in the spectrum between 500MHz and 6GHz, a band that includes TV broadcast, mobile phones, radar and Wi-Fi.
The first experiments involved measurements in Toshiba’s office in central Bristol and in typical indoor domestic settings. To harvest enough energy to power a small calculator (2μW) for 1 second, an antenna array covering 1.7 to 2.5 GHz with an effective area of 1m2 required 10 minutes of harvesting. A second experiment involved walking, driving and travelling by train around Bristol. As expected, outdoor ambient RF power densities were significantly higher than indoors. During the train journey between Bristol and Bath on average 17μJ energy could be collected, enough to power the calculator.

Demonstrating Multi-Constellation GNSS Reflectometry Using TechDemoSat-1

Jonathan Rawlinson
Surrey Satellite Technology Ltd

GNSS-R (Global Navigation Satellite System Reflectometry) is a novel technique for making measurements of the Earth’s surface using L-Band signal reflections from GNSS constellations, such as GPS, Galileo, Glonass and Beidou. In 2014, SSTL (Surrey Satellite Technology Ltd) launched the UK TechDemoSat-1 satellite with 8 payloads including the SGR-ReSI, a low cost and low power GNSS-R instrument. This payload has been in operation since commissioning in September 2014 and has been collecting reflection data for scientific use since. The primary application is ocean wind and wave retrieval, but reflections have also been recovered over land and ice, uncovering new applications for this technique. This paper describes the practicalities of GNSS-R, the current and proposed future usage, new developments and planned future work by SSTL in this area, including the first results from the recovery of Galileo signal reflections.

Designing Wideband Filters Having More Than 3 Octave Bandwidth

Bulent Alicioglu

Designing very wideband filters remains still a challenge for most of the cases even today. The suspended substrate stripline is still the ultimate choice for sharp filters with low loss. In this work a step by step approach will be presented for practical wideband filter design. The method/procedure will be verified through a 2 GHz HPF with a passband up to 18 GHz and measurement results will be presented.

Mechanical Design Techniques for maximizing PCB space and reducing system size and weight

Jeff Davis
Tennmax America Inc

Traditionally high frequency applications have used metal multi-cavity clamshell shields screwed down to the PCB.  To minimize the gaps, they would either place screws a few cm apart or place an extruded gasket on the walls and move the screws farther apart.  Both solutions require a wide PCB trace and excessive bosses that increase the weight of the metal and uses excessive amount of PCB space.  There are techniques that can reduce the amount of screws needed, while thinning the walls which will provide both weight reduction and width of the PCB traces (as low as 0.5mm). 

Another key item for reducing overall system size and weight is the removal of heat.  Metal is the only reasonable method for removing heat, but by using design techniques such as heat pipes or vapor chambers, you can increase the efficiency of the heat transfer which will allow you to reduce the overall fin and metal size.  You can quite often add the gaskets to the bottom of the thermal module to provide a single part for both heat and shielding with a single part.

Microwave Atomic Clocks at NPL

Mohsin Haji

Microwave atomic clocks can establish highly stable reference frequencies by using the exact frequency of microwave spectral lines of atoms. Caesium, for example, has hyperfine ground state lines that are separated by a frequency of 9,192,631,770 Hz, and this currently provides the fundamental unit of time (a second). The NPL caesium fountain primary frequency standard NPL-CsF1 is a type of microwave atomic clock used to contribute to the international timescale.  Microwave interrogation of atoms can also be used to form portable atomic clock systems. NPL have recently developed a prototype for a benchtop portable atomic clock system using ytterbium-ions, as well as a much more compact caesium based atomic clock, designed to fit in an enclosure of ~600 cm3. These systems will be described in more detail.

Mm-wave/THz Multi-Gigabit Wireless Links

Edward Wasige
University of Glasgow

The demand for broadband content and services worldwide is growing at a tremendous pace. Soon, traffic from wireless devices will exceed that of wired setups. Currently, high-resolution videos account for about 69 % of all data viewed on mobile devices and are expected to reach 79 % by 2020. At this pace, short-range wireless communication will soon require data transfer speeds of tens of gigabits per second (Gbps), which current wireless technology cannot support. A host of technologies are being actively researched to meet this challenge. In this talk, we will describe our research on the resonant tunnelling diode (RTD) technology to create ultra-broadband wireless communications. RTDs are compact, high-speed semiconductor devices that can function as transmitters and receivers. They can be modulated using electronic or optical signals and can also be used to modulate lasers. This makes them potentially valuable as a link between fibre and wireless domains. We will report on short range wireless links with data rates of over 10 Gbps using new RTD transmitters developed for the 100 GHz and 300 GHz regions of the radio spectrum. These speeds are over 1 000 times faster than the rates available at the moment.

Time resolved Raman thermography analysis of transient heating in pulsed GaN HEMT RF high power amplifiers

Filip Gucmann
University of Bristol

Measurement is a vital step in thermal model verification. We present a static/transient measurement and simulation study of a GaN high power pulsed transistor. Time resolved Raman thermography provides high spatial (0.5 µm-lateral) and temporal resolution (>10ns), enabling the temperature within the GaN, close to the channel peak temperature, to be measured. This technique is therefore an ideal reference measurement technique for GaN HEMTs which generate high temperature gradients close to the gate. We demonstrate this process of thermal model verification. Complimentary transient thermo-reflectance measurements are also performed on the field plate metal surface for comparison. The resulting experimentally validated finite element thermal simulation is used to derive a thermal equivalent circuit model, representing the thermal impedance (ZTH) of the tested device.


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 Wolfspeed for sponsoring in April 2019 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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