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A compact, low profile, transmission line antenna--Tunable over greater than octave bandwidth

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2 Author(s)
Wanselow, R.D. ; Northrop Nortronics, Newbury Park, CA, USA ; Milligan, D.

Techniques for extending the frequency tuning range of low profile top loaded antennas to greater than one octave are described. The compact antenna is a directly driven resonant radiator (DDRR) which consists of a vertical post radiator, the height of which is less than0.05lambdaat the highest operating frequency, and which is top loaded by a loosely spiraled unbalanced transmission line which employs a multiple-capacitor tuning scheme to achieve a wide-band, tunable resonant antenna. The measured antenna circuitQis of the order of 100 or greater and the radiation efficiency, over a large ground plane, is greater than 50 percent that of a quarter-wave monopole over the full operating range.

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Antennas and Propagation, IEEE Transactions on  (Volume:14 ,  Issue: 6 )