Design and Fabrication of a Waveguide Two-Dimensional Slot Array with Low Sidelobe Level of -35dB

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 4Language: englishTyp: PDF

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Zhang, Miao; Hirokawa, Jiro; Ando, Makoto (Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1-S3-19, O-okayama, Meguro-ku, Tokyo, 152-8552, Japan)

A 24-by-27 elements single layer waveguide slot array with Taylor distribution of -35dB sidelobe are designed and fabricated at 25.3 GHz. The hybrid design by using the combination of a full-wave method of moments (MoM) analysis and an equivalent circuit model is applied for the control of the aperture distribution and the reflection of the array all together; the slot admittance and spacing are designed under the condition of input impedance matching first in the equivalent circuit model while the slot parameters in 2-D array for realizing the active admittance specified above are iteratively determined in the full-wave MoM analysis,. The measurement of the test antenna confirms that the overall reflection is suppressed below -18dB over the frequency range of 24.3~26.3GHz and that the high antenna efficiencies of 53.9% with very low SLLs below -33dB are achieved by this hybrid approach.