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This paper describes design and measurement results of RF modules intended for a proposed spaceborne multimedia Ka-Band multiple-beam transmit phased array antenna. The developed modules include a four-beam RF Control Module (CM) for amplitude and phase shaping, a Solid State. Power Amplifier Module (SSPAM) for power amplification as well as a Radiating Module (RM). The CM is realised on a multilayer LTCC substrate with customdesigned 6-bit phaseshifter MMICs and 5-bit attenuator MMICs. The SSPAM is realised on thin-film substrates with GaAs MMIC amplifiers. The modules were designed to meet the electrical, mechanical and thermal requirements of the proposed antenna. Using the developed modules, a subarray demonstrator consisting of four radiating patches was reat ked. The measurement results show that specified key performance parameters are met and prove the feasibility of the antenna concept.These activities are co-funded by the European Space Agency (ESA) in the frame of the ARTES 3 Multimedia Programme. 4 520 27 (each containing 6 CM

A new feed system is presented providing dual polarized angle diversity operation of microwave links. It requires only one feed horn to generate the two main and two diversity beams, due to the utilization ofhigher order modes. First experimental results are provided for a feed system which has been integrated in a 4x4 m shell antenna (XPD improved) operating in the frequency band 5.925-6.425 GHz.

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