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This paper presents a dual-band design of reflectarray antenna by using metallic elements for high energy efficiency at 28 and 60GHz bands. The dual-band operation is created by considering the frequency bands below and above the cutoff frequency of metallic waveguides. This frequency band separation differentiates the waveguide's characteristics as a resonant and non-resonant reflecting elements,...
In this paper, an advanced X-band airborne SAR is introduced for demonstrating two-dimensional Digital Beamforming (DBF) techniques. The advanced system consists of 64 channels split into 4 column in azimuth and 16 rows in elevation. This airborne experiment system serves as a test bed for the development, implementation and testing of digital beamforming techniques for future High-Resolution Wide-Swath...
Time-domain probe errors analysis and correction are the essential technique in the antenna time-domain near field measurement, it is not only the basic work of all the antenna tests, but also determines the accuracy of the final test results. The present paper modifies the formulas of the time-domain probe errors analysis and correction from the problems of dispersion derived from the transmission...
We present an efficient procedure for the synthesis of planar array antennas to radiate contoured patterns in the near zone of array aperture, as desired in RFID applications. It first grids the target area, and then utilizes a global basis set to span the array's excitations. Each basis's excitation of the array radiates a focused spot beam in the near zone and serves as a local basis function for...
To reduce the hardware complexity which is aroused by the limitation of sampling theory because of the use of the frequency-domain method, a wide-band MIMO imaging method based on a symmetrical exponential distribution nonlinear array is proposed. Compared to the uniform linear array, this given exponential distribution nonlinear array has the lower sidelobe level and better imaging performance. Furthermore,...
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