This paper describes the design of a novel test-set for single-ridged waveguides in the 28.5 GHz band. The test-set composes of three main parts: a waveguide transformer with a 900 bend,a part of an antenna array (slots) represented by a ridged waveguide transmission line and a load. The transformer provides a single-ridged-waveguide-to-standard-WR-28 transition and vice versa. This transition forms the interface to the measurement equipment and parts of its design will also be applied to the original design of the antenna. The load can be tested by connecting it to the singleridged output port of the adapter or to the waveguide transmission line. This saves precious development time and costs, and enables also an accurate verification of the adapter design. The waveguide transmission line can be used to test different slot configurations. Some simulations have been performed to investigate the tolerance values required for manufacturing the test-set.
In this paper the main development issues for a X-band 1:32 distribution network are highlighted. Amplitude and phase balance of the microstrip circuit in a quite huge housing must be very accurate, while the different thermal expansion coefficients of the involved materials must be compensated without any effect to RF performance. By use of elastomer conductive gaskets, compensation of different expansion coefficients can be achieved together with RF de-coupling between all paths.
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