LTCC Endfire Antenna With Housing for 77-GHz Short-Distance Radar Sensors

An integrated antenna concept for miniaturized industrial short-distance continuous-wave (CW) radar-systems is presented. Highly accurate measurements with objects in the antenna's near field place special demands on the antenna design. By simulations, the letter shows a reduced phase error at short-distance measurements caused by the usage of corrugations and a novel housing concept. In addition to the increased accuracy the housing protects the sensor from cooling liquids and flying debris. This protection is further reinforced by a polymeric covering that does not influence the measurement accuracy, but allows the on-the-fly observation of metal cutting processes. Different covering polymers are determined relating to the antenna properties and resistance against chemicals. The influences on the beam shape and return loss are shown and verified by measurements.

[1]  Xin Wang,et al.  A 79-GHz LTCC RF-frontend for short-range applications , 2011, 2011 IEEE MTT-S International Microwave Symposium.

[2]  T. Zwick,et al.  W-band Vivaldi antenna in LTCC for CW-radar nearfield distance measurements , 2011, Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP).

[3]  Petr Cerny,et al.  Back radiation minimization of ultra wideband Vivaldi antenna for radar application , 2009, 2009 3rd European Conference on Antennas and Propagation.

[4]  T. Zwick,et al.  W-band short distance CW-radar antenna optimized by housing design , 2012, 2012 IEEE International Workshop on Antenna Technology (iWAT).

[5]  N. E. Frost,et al.  Investigation into the effect of transformer oil on polymers , 1996 .

[6]  M.A.K. Hamid,et al.  Microwave Surface Level Monitor , 1971, IEEE Transactions on Industrial Electronics and Control Instrumentation.

[7]  Anatol Wiesner.  A multifrequency interferometric CW radar for vital signs detection , 2009, 2009 IEEE Radar Conference.

[8]  R. D. Pollard,et al.  A rectangular dielectric waveguide technique for determination of permittivity of materials at W-band , 1998 .

[9]  Werner Wiesbeck,et al.  Innovative Material Modulation for Multilayer LTCC Antenna Design at 76.5 GHz in Radar and Communication Applications , 2003, 2003 33rd European Microwave Conference, 2003.

[10]  Douglas L. Maskell,et al.  A high accuracy microwave ranging system for industrial applications , 1993 .

[11]  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.

[12]  Zbyněk Raida,et al.  Wideband feeders for millimeter-wave horn antennas , 2010, 15th Conference on Microwave Techniques COMITE 2010.