Research On 3mm LTCC Transceiver Technology

Due to the advantage of high-density integration and good performance in micro-millimeter wave frequency, LTCC technology(Low Temperature Co-fired Ceramic) has become a hot research topic among scholars around the world since it appeared. Based on LTCC technology and Millimeter-wave(mm-wave) transceiver technology, W-band transceiver has been researched. At the same time, several important mm-wave passive components are researched and some new structures are developed, which will do good to improve the performance of our transceiver.In this thesis, mm-wave key passive components are researched. Based on LTCC technology, we improve a transition structure between waveguide and microstrip, tested results show that return loss and insertion loss between than 13 dB and 0.35 dB are achieved from 32.5GHz to 37.5GHz. Besides the research of waveguide to microstrip,we put forward three kinds of new filter model in W-band.(1) In the first filter model,we proposed a new kind of coupling structure between cavity resonators, whick makes the tuning varibles of the coupling structure much more than before.(2) In the second filter model, we replace the metallic vias with metallic walls of the SIW structure,which makes the SIW structure more like the standard rectangle waveguide. It will make filter simulation faster and more precise with this change. Because the filter is designed and fabricated with ceramic board, it is very easy to integrate the filter with microstrip circuit.(3)The third filter is designed with dual-mode filter theory on LTCC board, which occupies the first three LTCC layers. The tested results show that the insertion loss and return loss are better than 1.5dB and 20 dB, except for one point, the stopband rejection during the band 75-90 GHz and 98-110 GHz is better than 30 dB, the3 dB relative bandwidth is only 3.6%. Good grounding and heat dissipation are very important for mm-wave system to work well, to solve this problem, this paper put forward some effective solutions, which were applied in the transceiver module, and achieved good results. The W-band transceiver based on LTCC technology can achieve the biggest gain of 21.4dB and the output power of 24 dBm from 93 GHz to 95 GHz, the measured spurious frequency rejection from 93 GHz to 94 GHz is about 30 dBc.Although the test results do not fully meet the design requirements, but the research of this thesis accumulates precious experience for the second version of the design.In addition to the research of W-band transceiver module based on LTCC technology, this paper also developed a Ka-band transceiver module based on LTCC technology and a W-band transceiver module based on HMIC technology, and both have achieved good results.In this paper, a W-band transceiver module based on LTCC technology is successfully developed which constructs the foundation for the further study. Some novel passive circuits were put forward in this paper, which has important application value for the miniaturization and high performance of the system.