Design, Fabrication, and Testing of an Active Microstrip Antenna for GPS
Advisor: Dr. S.N. Prasad
In an active antenna, an active device such as an amplifier or an oscillator
is integrated with the passive antenna. The implementation of an amplifier
in a passive antenna increases gain, and improves noise performance. Active
microstrip antennas are very widely used because they are small, inexpensive,
compact, efficient, and reliable. An overall system gain of 40dB is very
practical in a two-stage configuration, while the noise factor is on the
order of 3dB. Circularly polarized antennas are required for use with GPS,
the single-fed design being less expensive and therefore preferred over
dual-fed. The common two-stage amplifier incorporates a low-noise amplifier
as the first stage and a high-gain amplifier as the second stage, for maximum
gain and minimum noise factor. In this presentation, the design, fabrication
and measurements of the active antenna will be discussed.
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