FINAL PRESENTATION DAYS - PAYLOAD TECHNOLOGIES AND PRODUCTS

Ka-band Circular Waveguide Quadruplexer Development

Not scheduled

45m

Einstein Aj033 (ESA/ESTEC)

Oral Presentation

Speaker

Mr Paul Booth (Airbus Defence and Space Ltd (UK))

Description

The programme was to develop a feed mounted Ka-band quadruplexer. This component will be developed for multi frequency antennas and will employ a combination of non-standard Tx and Rx bands. The filters were realised in a mixture of circular waveguide for the narrow band filters, traditional rectangular for wideband filters and a dual mode rectangular filter. Far-out-of-band rejection was provided where possible by integrating various techniques obviating the need for lowpass or ‘cover’ filters. The quadruplexer development focussed on the four bands detailed below: Tx1: 20.2GHz to 21.2 GHz Tx2: 25.5GHz to 27.0 GHz Rx1: 27.83GHz to 28.44 GHz Rx2: 30.0GHz to 31.0GHz With an operating band of over 10GHz the manifold design was critical and techniques were used to shift manifold generated resonances into unused bands. A key advantage that the design offers to the payload is the use of a single fed as opposed to a dual fed antenna or even a single antenna rather than two antennas. If the quadruplexer was part of the standard payload then there would be a very long run of waveguide operating at the extremes of its frequency range which has a significant impact on loss and over-moding. A dual fed reflector has mass implications and is usually a non-optimum solution.

Presentation materials

summary

D1P09_Ka-band_Circular_Waveguide_Quadruplexer_Development.pdf