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Optimal Noise Matching for Mutually Coupled Arrays

2007; IEEE Antennas & Propagation Society; Volume: 55; Issue: 6 Linguagem: Inglês

10.1109/tap.2007.898596

1558-2221

Karl F. Warnick, Michael A. Jensen,

Antenna Design and Analysis

From classical two-port noise theory, the noise figure of an amplifier is minimized when a source is matched to a particular optimal reflection coefficient at the amplifier input. In this paper, we show that this result extends in a natural way to the multiport case, with a coupled N-port source network such as an array antenna connected by a multiport matching network to the inputs of N low-noise amplifiers. For optimal noise performance, the matching network must decouple the array and present isolated, individually noise-matched ports to the amplifier inputs.