Tunable Bandpass Filter Circuit. Additionally f center can be varied between 6 8 ghz to 16 8 ghz by applying an analog f. The digitally tunable band pass filter in this article covers a frequency range of 132 mhz to 148 mhz and can handle up to 26 dbm of rf power.
100 24 2 16 trimmer tunable 126 140 pf for 172pf capacitor value use. This is the circuit diagram of the rc passive bandpass filter. The measured results indicate that the differential mode tuning centre frequency range extends from 0 97 to 1 72 ghz the 3 db abw is 80 5 mhz and the cm suppression is 30 db in the differential mode operating passband.
The 3 db filter bandwidth is approximately 15 of the center frequency f center and the 20 db filter bandwidth is 37.
Then the op amp is used for the. Then the op amp is used for the. In this paper a novel planar waveguide filter based on liquid crystal materials is devised and a half mode corrugated substrate integrated waveguide hmcsiw tunable bandpass filter with complementary split ring resonator csrr structure is proposed. Passive or active a bandpass filter allows a certain range of frequencies to pass through and greatly attenuates all frequencies outside of this passband.
