Research On Integration Technology Of 3mm LTCC Transceiver

Currently millimeter wave band is the main band for military electronics, specially for precision-guided missiles, aspects, radar, electronic warfare, etc. Its applications in wireless communications have attracted widely attention. Meanwhile, miniaturization and high integration are important direction for future development of microwave and millimeter wave systems. Traditional hybrid integrated circuit is bulk, so MCM(multi-chip module) technology is faced with the best development opportunity. LTCC technology, as one of the main MCM, is widely used in millimeter-wave systems with its excellent electrical, mechanical and thermal properties.This paper focuses on domestic W band millimeters related technologies, and several key passive components are given in theoretical analysis and experimental verification, including microstrip-waveguide transition, transition microstrip double probes and waveguide circulator, waveguide E-plane T junction, waveguide branch couple. Generally, waveguide circulator is simple, easy to process and E-plane T-junction works in wide bandwidth. Meanwhile its amplitude and phase balance between every way is good. The branch coupler is worse compared. Slight error in fabrication results in deterioration in performance. It brings the direction for a low-loss and high efficiency of power combining of the project.Finally, W-band transceiver module LTCC-based is developed. According to the project requirements, it is divided into pre-research part and prototype engineering prototype part. Pre-research prototype for W-band LTCC transceiver module is aimed at the integration technology validation and realization, which successfully achieved the targets. After measurement, the pre-research prototype works within 93 ~ 95 GHz. Output power is greater than 25.68 dBm, spurious suppression of greater than 32 dBc. Excellent noise figure of the receiving branch is 6.1dB, Gain greater than 44.42 dB. On the other hand, prototype engineering prototype is composed of LTCC up-conversion module, filter module, the first stage drive module, second stage drive module and final amplifier module. Separate modules designed simplifies the difficulty of design, improve design reliability. Engineering prototype is tested in a desired frequency within the 90 ~ 95 GHz, the receiver achieves a noise figure better than 6.85 dB. The minimum is only 4.93 dB. Gain is greater than 22.3dB. Output power is greater than 1.39 W, spurious signal suppression is greater than 30.9dBc.