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[摘要]：The active integrated antenna (AIA) concept has been applied to design a broadband receiver front-end. A design procedure for active broadband patch antennas based on resistive equalization is presented. The use of the AIA has allowed the design of efficient RF front-ends by increasing its effective gain, noise figure, and merit G/T. In addition to improving the classical parameters, the resistive equalization technique allows enlarging the bandwidths of the active antenna parameters versus the corresponding ones in passive antennas. A receiving patch antenna (with one amplifying stage) with a measured noise figure lower than 0.6 dB in a bandwidth over 38% and an effective gain improvement of 13 dB over the corresponding passive antenna has been achieved. The G/T-parameter has also been measured for both the active and passive antenna, resulting in a relative planar G/T of -16 dB/K, with a ripple of 0.5 dB, over a 30% bandwidth for the active antenna versus a G/T of -22 dB/K for a typical front-end with a passive antenna over 20 % bandwidth. |
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