Frequency-Agile, Efficient, Circularly Polarized, Near-Field Resonant Antenna: Designs and Measurements


A frequency-agile, efficient, circularly polarized (CP), close to-field resonant parasitic (NFRP) antenna is presented. It consists of two orthogonal capacitively loaded loops (CLLs) with similar configurations placed vertically with respect to a finite ground disc and serve as the NFRP components. They are placed in the near field of two monopoles fed from one coax feedline. A try of varactor diodes is incorporated into the NFRP elements to realize its frequency-agile behavior. The NFRP elements produce nearly complete matching at frequencies abundant not up to the fundamental modes of the monopoles without any matching circuit. Frequency tunability is demonstrated over a wide effective impedance bandwidth and also the antenna is characterized as having sensible axial ratio (AR) and high radiation efficiency. A proof-of-concept experiment made affordable agreement with the simulation studies. The measured results demonstrate that the frequency-agile prototype created a 3.92p.c fractional three-dB AR bandwidth, which is additional than four times larger than the 0.eighty fourp.c worth of the first fastened-capacitor passive system. Moreover, sensible impedance matching ( ); relatively high radiation potency ( ); symmetrical, stable, and uniform radiation patterns; CP performance; and peak gain values between 5.eighty one and 5.ninety three dB were measured over this frequency-agile range.

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