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The input admittance of the rectangular cavity-backed slot antenna

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1 Author(s)
C. Cockrell ; NASA Langley Research Center, Hampton, VA, USA

The input admittance of the rectangular cavity-backed slot antenna is investigated. The slot is assumed narrow so that the voltage distribution in its aperture is sinusoidal. Equations which represent the input admittance of this slot, backed by a rectangular cavity in which a single propagating wave is assumed to exist, are given. Calculations based on these representations are compared to available measured data. As the depth of the cavity increased the resonant frequency decreased and the bandwidth became narrower. Input admittance curves as a function of electrical slot length are also presented for several size cavities.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:24 ,  Issue: 3 )