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K-Band Varactor Diode-Tuned Elliptical Slot Antenna for Wideband Imaging

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4 Author(s)
Kharkovsky, S. ; Electr. & Comput. Eng. Dept., Missouri Univ. of Sci. & Technol., Rolla, MO, USA ; Ghasr, M.T. ; Abou-Khousa, M.A. ; Zoughi, R.

Small resonant elliptical slot antennas have shown great potential as imaging array elements at microwave frequencies. For high-resolution 3D imaging applications it is desirable to extend the operational frequency bandwidth of these elements. One way to achieve this is by loading the slot with a varactor diode, and electronically tuning its resonant frequency. This communication presents the design, analysis, and implementation of a varactor diode-tuned elliptical slot antenna at K-band (18 GHz-26.5 GHz). The slot antenna is then used to produce single-frequency and wideband multi-frequency synthetic aperture radar (SAR) images of two targets located at different distances to show the efficacy of using this slot for wideband imaging.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 11 )

Date of Publication:

Nov. 2011

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