2.4GHz石英窄带低损耗声表面横波谐振滤波器

2.4GHz Surface Transverse Wave Resonator Filter with Low Loss and Narrowband on Quartz

该文描述了一种工作频率在S波段的低损耗极窄带声表面横波谐振滤波器,解决了整机系统在高频率S波段载波近端的杂波抑制。采用一阶温度系数为0的石英基片及比瑞利型声表面波波速高1.6倍的声表面横波,制作出3dB带宽大于1‰的低损耗窄带谐振滤波器,其工作频率达2.4GHz,损耗为5.77dB,3dB带宽为3.0 MHz,在50Ω测试系统中测试,偏离中心频率±7 MHz的阻带抑制为25dB;在-40^+85℃内,频率漂移仅为705kHz。

A surface transverse wave resonator filter with narrow bandwidth and low loss in S-band was intro- duced, which could solve the problem of clutter suppression near the carry of high frequency in the system. Quartz substrate with zero first stage temperature was used, and the surface transverse wave with 1.6 higher velocity than that of then Rayleigh wave was generated. The narrow bandwidth and low loss resonator filter was made with 3 dB bandwidth larger than 1‰. The insertion loss was 5.77 dB, bandwidth of 3 dB was 3.0 MHz. Measuring in the 50 system, the suppress at the --47 MHz via the center frequency was more than 25 dB;the frequency drift was only 705 kHz at the temperature range of --40-＋85 ℃.