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24-GHz Bandwidth-Enhanced Microstrip Array Printed on a Single-Layer Electrically-Thin Substrate for Automotive Applications

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2 Author(s)
Liang Han ; Dept. de Genie Electr., Univ. of Montreal, Montréal, QC, Canada ; Ke Wu

A 24-GHz microstrip array antenna is developed on a single-layer electrically-thin substrate to provide a cost-effective solution for automotive applications. By etching two straight slots close to and parallel with the non-radiating edges, the impedance bandwidth of a conventional rectangular microstrip patch is enhanced without affecting its radiation characteristics. To demonstrate the effectiveness of the proposed technique, an 8 * 8 planar array with a specified sidelobe level of 25 dB in both the E -plane and H -plane is studied and prototyped on the commercial substrate RT/duroid 5880 with a thickness of 0.25 mm. The measured impedance bandwidth for VSWR less than 2 is about 1.8 GHz, which corresponds to a relative bandwidth of 7.5%. In addition, the measured gain is 22.5 dBi at the center frequency while it is higher than 21 dBi over a frequency band of 1 GHz. Finally, the measured sidelobe level is 20 dB in the E -plane and 18 dB in the H -plane.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 5 )

Date of Publication:

May 2012

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