AD430 antenna with interdigital filter



Gain and noise figure of a low noise amplifier with an interdigital filter

tuned for DGPS reception (as used in the AML antenna  AD430/3141). The response is characterised by a low filter loss and hence low noise figure (<3dB) in the required pass-band, with rapid 'roll-off' either side. The measurements were obtained with an HP 8970B noise figure meter.



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