This paper uses a relatively simple but very practical design method. A miniaturized, low-loss, medium-bandwidth quartz crystal filter is designed and developed using a four-section, eight-crystal differential bridge circuit. The center frequency of this product is 10.7 MHz, the passband bandwidth is medium, the stopband suppression requirement is high, the insertion loss is small, the rectangular coefficient is small, and the crystal filter size is small. The key technical problems to be solved are: the design of the crystal filter circuit, the design of the filter crystal resonator, the realization of the filter\'s insertion loss IL≦3 dB, 3 dB bandwidth Bw3dB≥±19 kHz, passband fluctuation ≦1 dB, stopband attenuation ≥60 dB (outside the center frequency of 50 kHz) and other technical indicators.
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