Research On K-band Frequency Antennaand Tr Module Based On LTCC Technology

Nowadays the requirement of the modern radar and communication for the antennas of the high speed sweep, detecting multiple goals, good anti-interference and high speed reaction is improved. The active phased array satisfy these requirements.The active phased array is mainly discussed in this thesis, which includes the antenna array and the T/R module. The antenna array include many unit antenna which can be controlled to adjust the range and phase of the signal, and the corresponding T/R module adjusts the range and phase of the signal. The integration of the T/R module and the antenna array is valuable for the miniaturization and the reduction of the cost. The Low Temperature Co-fired Ceramic technology is used in this thesis for the realization of the integration and the miniaturization of the T/R module and the antenna array.Based on the LTCC technology, the manufacture of the eight channels T/R module has been realized in this thesis. And the whole system’s scheme designing, chips selecting, material object realization and test are completed. For the eight T/R modules of the phased array, how to control the attenuator and the phased shifter in each TR module is very important. The Single-Chip Microcomputer is programmed to communicate with the computer and the TR module. The order is put into the computer software and the computer software transfer the order to the Single-Chip Microcomputer. Finally, The phase shifter, the attenuator and the switches are controlled by the signal from the Single-Chip Microcomputer in order to control the antenna array beam sweep and change the T/R work state of the T/R module.A new kind of the H-plane horn antenna based on Substrate integrated waveguide technology is designed in this thesis and realized by the LTCC technology. The SIW technology allow the H-plane horn antenna to be realized in plane structure. However,when the LTCC substrate thickness is much thinner than the wavelength, the poor matching, undesired back radiation and low gain of SIW horn antenna appear. The new structure entirely overcomes these limitations. It consists of a printed transition which improves the matching performance and front-to-back ratio(FTBR). The dielectric loading which is integrated with the horn in the same single substrate improves the gain of antenna. The relative bandwidth of the antenna is improved to 15%, and the gain of the antenna is improved to 6dB from 5dB. Finally, the antenna array is realized, andbecause of the controlling the phase of the unit antenna, the beam of the phased array is controlled. Applying the algorithm of Taylor weighted distribution, the side-lobe level has been improved, which less than 20 dB within ±30°scanning angle range.