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V-band Integrated Filter and Antenna for LTCC Front-End modules

In this paper, fully integrated filter and antenna functions are demonstrated as a system-on-package (SOP) compact front-end solution for the low-temperature cofired ceramic (LTCC) based V-band modules. The compact and easy-to-design integrated passive functions of filter and antenna have been hereby experimentally validated. A 4-pole quasi-elliptic band pass filter composed of four open loop resonators has been developed. It exhibits an insertion loss < 3.48 dB, a return loss > 15 dB over the pass band (~3.4 GHz) and a 3dB bandwidth of about 5.46 % (~3.4 GHz) at the center frequency of 62.3 GHz. In addition, a series fed 1by4 linear array antenna of four microstrip patches exhibiting high gain and fan-beam radiation pattern has been designed in a way that allows for an easy integration into a V-band multi-gigabit-per-second wireless link system. Its 10 dB bandwidth is experimentally validated to be 55.4-66.8 GHz (~18.5 %). The above proposed designs have been combined together, leading to the complete passive integration with high level of selectivity over the band of interest. The excellent overall performance of the integrated solution is verified through a 10 dB bandwidth of 4.8 GHz (59.2-64 GHz) and a return loss > 10.47 dB over the passband