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A new approach to active antenna design

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2 Author(s)
Nordholt, Ernst H. ; Delft Univ. of Technology, Delft, The Netherlands ; van Willigen, Durk

Design considerations for wide-band active antenna circuits for frequencies up to 30 MHz are presented. High performance is obtained by using unusual amplifier types having a virtually grounded input electrode of the input active device, and a large amount of negative feedback over several stages. The realized antennas with a physical length of 0.5 m have a flat frequency response from 5 kHz to 30 MHz and extremely low distortion (second-order intercept >+70 dBm, third-order intercept > +50 dBm). The antennas are thoroughly protected against statics; without sacrificing the high dynamic range. Output power levels up to +28 dBm can be handled. The electric field strength may exceed 10 V/m. The equivalent input noise field strength amounts to about 25 nV/m \sqrt {Hz} .

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:28 ,  Issue: 6 )