Low-cost antenna-in-package solution for 122 GHz radar module

In this paper, a glob-top packaging solution using thermally conductive adhesive Polytec TC 430-T is demonstrated which can be adapted for mass production using standard assembly effort. The packaging concept is first tested on two dummy chips connected by λ/2 wirebonds. Thereafter, the packaging concept is implemented on a 122 GHz wirebond based Antenna-in-Package (AiP). The off-chip circuitry of the AiP contains a monostatic circularly polarized (CP) microstrip patch antenna and a branchline coupler. Finally, the feasibility of realizing a 122 GHz low-cost, fully integrated, surface mountable monostatic radar sensor package is evaluated on the basis of simulations and probe based measurements carried out in the frequency range of 110 GHz and 170 GHz.

[1]  Thomas Zwick,et al.  Miniaturized 122 GHz system-in-package (SiP) short range radar sensor , 2013, 2013 European Radar Conference.

[2]  Thomas Zwick,et al.  Miniaturized 122 GHz ISM band FMCW radar with micrometer accuracy , 2015, 2015 European Radar Conference (EuRAD).

[3]  John Papapolymerou,et al.  Characterization of liquid crystal polymer from 110 GHz to 170 GHz , 2014, 2014 IEEE Radio and Wireless Symposium (RWS).

[4]  Thomas Zwick,et al.  Probe based radiation pattern measurements for highly integrated millimeter-wave antennas , 2010, Proceedings of the Fourth European Conference on Antennas and Propagation.

[5]  Edward J. Wollack,et al.  Millimeter-wave antireflection coating for cryogenic silicon lenses. , 2006, Applied optics.

[6]  Duixian Liu,et al.  Antenna-on-Chip and Antenna-in-Package Solutions to Highly Integrated Millimeter-Wave Devices for Wireless Communications , 2009, IEEE Transactions on Antennas and Propagation.

[7]  D. Pozar.  Microwave Engineering , 1990 .

[8]  Vincent F. Fusco,et al.  Understanding and measuring circular polarization , 2003, IEEE Trans. Educ..

[9]  F. Schwering,et al.  Gain enhancement of a thick microstrip antenna by suppressing surface waves , 1994, Proceedings of IEEE Antennas and Propagation Society International Symposium and URSI National Radio Science Meeting.

[10]  T. Zwick,et al.  Coplanar 122-GHz Antenna Array With Air Cavity Reflector for Integration in Plastic Packages , 2012, IEEE Antennas and Wireless Propagation Letters.

[11]  Thomas Zwick,et al.  122-GHz chip-to-antenna wire bond interconnect with high repeatability , 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest.