Filter, integrated passive device, electronic device and display device

A filter, comprising:

• a first port, a second port, a first band-pass filter circuit, a second band-pass filter circuit and a third band-pass filter circuit;
• wherein the first band-pass filter circuit is connected with the first port and is configured to output a first signal after suppressing a signal with a frequency between a first frequency and a second frequency in an initial signal input from the first port;
• the second band-pass filter circuit is coupled with the first band-pass filter circuit, and is configured to receive the first signal, and output a second signal with a frequency between a third frequency and a fourth frequency in the first signal;
• the third band-pass filter circuit is coupled with the second band-pass filter circuit, and is configured to receive the second signal, and output a third signal with a frequency between a fifth frequency and a sixth frequency in the second signal to the second port;
• wherein the first frequency is less than the second frequency;
• the third frequency is between the first frequency and the second frequency;
• the fifth frequency is between the third frequency and the second frequency;
• wherein the sixth frequency is greater than the second frequency and the fourth frequency is greater than the sixth frequency.