Active loop-dipole aerials

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© The Institution of Electrical Engineers
Published 16/07/2012

Abstract

A theoretical study of the input impedance of active loop-dipole aerials which possess height-reduction properties at resonance is made. This is compared with measurements on an aerial containing a BFY 90 transistor at 200 MHz for which the transistor parameters are available. Reasonable agreement is obtained. The existence of separate power gains and radiation patterns for transmitting and receiving is also established, and a comparison of the theoretical and experimental radiation patterns in the two cases is made. Numerical values of radiation resistance for these aerials are also calculated.

Inspec keywords: active antennas; resistance (electric); antenna radiation patterns; dipole antennas; electrical impedance

Other keywords: dipole antennas; impedance; antenna radiation patterns; radiation resistance; 200 MHz; active antennas

Subjects: Single antennas

References

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      • Hakim, S.S.: , Junction transistor circuit analysis, 1962, (Wiley), p. 98-104
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