Circuit design solution for broadband antenna amplifier of short-pulse ionosonde

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Abstract
Field tests of compact ultra-wide-band MMIC amplifiers and multi-element two-stage amplifiers on discrete transistors with lossless transformer feedback as broadband antenna amplifiers of short-pulse ionosonde have been performed. Daytime tests have shown the obvious advantage of discrete transistor amplifiers due to the inherent ability of lossless transformer feedback amplifiers to filter out interference with frequencies above 30 MHz due to the use of numerous ferrite trans-formers between the amplifier stages. Our proposed symmetrical (push-pull) version of the lossless transformer feedback amplifier attenuates strong interference more strongly than the classic unbalanced (single-ended) version of such an amplifier.