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In active transmitting arrays, high-power amplifiers (HPA) are conveniently used to provide microwave power at the input of each radiating element. They are generally connected to the radiating elements through isolators, designed to reduce the influence of the surroundings on the amplifiers load. Load-pull effects may indeed affect the transfer characteristics of HP As and even destroy them above...
A method of calculating the radiation and directivity pattern of planar Archimedean printed spiral antenna backed with an arbitrarily shaped reflector is described. Application of the equivalence principle and the reaction concept of Rumsey leads to the variational formulation of the integral equation expressing the electric field in terms of equivalent currents. The method takes into account the...
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