Band-pass filter with function of frequency readjustment contains electromagnetically connected resonators from sections of transmission lines, one ends of which are loaded with alternating capacitances, and electric connections are connected to other ends. Electrical connections are made as switches with two switched inductors of different magnitude
The utility model relates to ultra-high frequency technology and can be used in frequency selective devices, namely: in microwave telecommunication systems, in order to simultaneously operate both the receiver and the transmitter on one antenna, to prevent electromagnetic oscillations of the local oscillator from entering the antenna, in order to protect the first stages of the receiver from significant external interference, to reduce the effect of noise of the local oscillator on the mixer, in order to limit the radiation spectrum of the transmitter and as a result meet the requirements of electromagnetic compatibility.