Abstract
ABSTRACTA meandered substrate integrated waveguide (SIW) has been proposed for the frequency scanning array that has potential application of the low cost 24‐GHz Doppler radar system. All radiating slots are connected in series using a short circuit ended SIW; therefore, its radiation beam can be steered with frequency. The modified antenna with meandering structure is proposed to enhance the scanning range. The physical slot spacing is kept at about half free space waveguide, whereas the electrical spacing is about 540° at the center frequency of 24 GHz. A broadside radiation is achieved at 24‐GHz frequency and a ±30° continuous scanning range is experimentally confirmed with the frequency band from 23 to 25 GHz. Another antenna with center frequency of 77 GHz is designed and tested. It also achieves a ±30° continuous scanning range with the frequency band from 75 to 79 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1478–1483, 2014
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