English
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Abstract—A focal plane array feed of electrically small elements
has been proposed as a means for achieving high sensitivity for
radio astronomy applications in the presence of radio frequency in-
terference (RFI). For a broadband system, mutual coupling effects
become significant as the array element spacing becomes small rel-
ative to the electromagnetic wavelength. We present a theoretical
framework for modeling the effects of mutual coupling and for de-
termining the optimal multiport matching network between array
elements and front-end transistor low-noise amplifiers for max-
imum signal-to-noise ratio (SNR). Numerical results are given for a
model scenario including spillover and amplifier thermal noise and
point signal and interference sources. A suboptimal self-impedance
matching network yields performance close to that of a full net-
work match.
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