A digita-control selectable microstrip filter bank with a wide frequency range has been designed, and the single gating of the filter bank is realized by using the microwave switch. The harmonic characteristic of a resonator loaded with a capacitor is analyzed. Each bandpass filter is designed as a comb line structure and its structural parameters are optimized by using an advanced design system (ADS). The proposed digital-control filter bank is composed of two microwave switches chips with decoders and four microstrip filters. The simulation results show that the on-off state of each filter is controlled by three-bit binary codes which can realize the gating of each filter with a frequency range from 500 MHz to 2 000 MHz.