18 Jul 2018

High-power 9-way radial combiner for BAE Systems’ radar upgrade

Link Microtek, the manufacturer of RF and microwave subsystems and components, has designed and produced a compact high-power 9-way radial combiner specifically for BAE Systems as part of a programme to upgrade customers’ S-band radar transmitters by replacing their magnetrons with multiple solid-state power amplifiers (SSPAs).

Typically, the SSPAs are individual blades housed within a 19in cabinet, and their outputs need to be combined then fed via waveguide to the radar’s large rotating antenna; it is this function that the special 9-way combiner performs.

According to Link Microtek’s managing director, Steve Cranstone, there were several challenges involved in the design of the special combiner: “Firstly, the device had to be able to handle extremely high microwave power and be sufficiently small to fit comfortably at the back of an SSPA cabinet.”

In addition to meeting these specifications, there was another crucial consideration. One of the main reasons for upgrading radar transmitters with SSPA technology is to introduce a degree of fault tolerance into the system.

Cranstone again: “Because of this fault-tolerant approach, it was vital for the combiner to be designed in such a way that it continues to perform correctly in the event of one of the SSPAs failing. The particular style of combiner we employed – a radial, resonant-cavity design – is inherently superior at handling such non-optimum conditions and mismatches, but even so, a lot of modelling and simulation work went into the development of the device.”

Another advantage of the resonant-cavity design is its compact size compared with other types of combiner. The 9-way device, with its impressive peak power capability, measures just 194mm in diameter and has a depth of only 58mm, excluding the N-type input connectors and WR284 waveguide output. In terms of microwave performance, the combiner achieves a VSWR of 1.4:1 (maximum), an insertion loss of less than 0.5dB and a peak input power rating of 2.5kW.

To complement the combiner, Link Microtek also designed and produced a special 50dB S-band WR284 coupler for monitoring the microwave power at the combiner’s output. Both parts are fabricated from aluminium with a satin black finish.

The first radar transmitter to be equipped with SSPAs and Link Microtek’s special 9-way combiner is now in service, and BAE Systems is now offering the upgrade to other customers.

Most popular news in RF topics

Personal RF safety monitor protects workers from electromagnetic fields
First Wize compliant RF module
Anritsu Introduces W1 Coaxial Components
SPDT non-reflective RF switch offers performance and high-speed switching
Rugged RF power transistor targets 50V FM radio broadcast applications

All news in this channel | All news


Share this page


Want more like this? Register for our newsletter





GaN’s Ground-Floor Opportunity Rudy Ramos | Mouser Electronics
GaN’s Ground-Floor Opportunity
The electronics industry has a major role to play in helping to save energy, by enabling better equipment and new ways of working and living that that are more efficient and environmentally friendly. Maintaining the pace of technological progress is key, but improvements become both smaller and harder to achieve as each technology matures. We can see this trend in the development of power semiconductors, as device designers seek more complex and expensive ways to reduce switching energy and RDS(ON) against silicon’s natural limitations.









Radio-Electronics.com is operated and owned by Adrio Communications Ltd and edited by Ian Poole. All information is © Adrio Communications Ltd and may not be copied except for individual personal use. This includes copying material in whatever form into website pages. While every effort is made to ensure the accuracy of the information on Radio-Electronics.com, no liability is accepted for any consequences of using it. This site uses cookies. By using this site, these terms including the use of cookies are accepted. More explanation can be found in our Privacy Policy