A 79-GHz Radar Sensor in LTCC Technology Using Grid Array Antennas

Concept, design, and measurement results of a frequency-modulated continuous-wave radar sensor in low-temperature co-fired ceramics (LTCC) technology is presented in this paper. The sensor operates in the frequency band between 77–81 GHz. As a key component of the system, wideband microstrip grid array antennas with a broadside beam are presented and discussed. The combination with a highly integrated feeding network and a four-channel transceiver chip based on SiGe technology results in a very compact LTCC RF frontend (23 mm <formula formulatype="inline"><tex Notation="TeX">$\times$</tex></formula> 23 mm). To verify the feasibility of the concept, first radar measurement results are presented.

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