Research On Ka Band Ferrite Phase Shifter Base On LTCC Technology

Phased array radar’s performance quitely depends on the volume and performance of phase shifter which is core component of phased array radar. Due to its large phase shift, low insertion loss, etc. Ferrite phase shifter has been widely used in phased array radar. However, with the trend of miniaturization and integration of microwave components, the volume of ferrite phase shifter has become the key issue restricting its development. The appearrance of LTCC technology provides an effective solution to the ferrite phase shifter’s miniaturization and integration. The cooperation of LTCC technology and ferrite devices has an extremely important development significance.In this paper we mainly studied the influence of ion substitution and preparation technology of LiZn gyromagnetic ferrite material with high remanence ratio and high Curie temperature on its low-temperature sintering and designed a kind of ferrite phase shifter based on LTCC technology. First of all, by changinging the formula and improving preparation technology,we achieved a kind of Li Zn gyromagnetic ferrite material of tunable high saturation magnetization, high remanence ratio(>0.85), low coercivity(100A/m), low ferromagnetic resonance linewidth(155Oe).Secondly,we sucessfully applied this material in LTCC technology by a series of researchs. Finally, we designed two type of Ka-band ferrite phase shifters with coupled transmission line.The microstrip line phase shifter’s insertion loss is less than 2.5dB, VSWR is less than 2, the phase shift is up to 280 °in the 30 ~ 31 GHz,.The stripline phase shifter’s insertion loss is less than 0.4dB, VSWR is less than 1.5 within the 32 ~ 34 GHz, the phase shift in 32.8 ~ 33.4GHz can reach 328 °.