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。 This paper describes a low-loss ultra-narrow band SAW filter operating at S band, which solves the problem of clutter suppression in the near-end of the high-frequency S-band carrier of the whole system. A low-loss narrow-band resonant filter with a 3dB bandwidth of more than 1 ‰ was fabricated by using a quartz substrate with a first-order temperature coefficient of 0 and a surface acoustic wave of 1.6 times higher than the Rayleigh-type surface acoustic wave with a working frequency of 2.4 GHz. The loss is 5.77dB and the 3dB bandwidth is 3.0 MHz. When tested in a 50Ω test system, the stopband rejection of ± 7 MHz from the center frequency is 25dB, and the frequency drift is only 705kHz from -40 to + 85 ° C.