Variable capacitance diode tuned reconfigurable multifunctional microstrip filter

The invention relates to the field of wireless communication systems, in particular to a variable capacitance diode tuned reconfigurable multifunctional microstrip filter, which comprises a low-pass filter, a high-pass filter, a switch 1, a switch 2, a switch 3, a switch 4, an input transmission line, an output transmission line and a microstrip connecting line, the switch 2 is arranged at the output end of the low-pass filter, and the switch 1 is arranged at the input end of the high-pass filter; a switch 3 is arranged at one end of the microstrip connecting line, and the microstrip line is connected between the switch 1 and the high-pass filter through the switch 3; a switch 4 is arranged at one end of the microstrip connecting line, and the microstrip line is connected between the switch 2 and the low-pass filter through the switch 4; four different connection modes are formed through on-off switching of the switch 1, the switch 2, the switch 3 and the switch 4, five different filtering functions are achie