To Study the Effect of Center Frequency and Bandwidth on Quality Factor of Microstrip Interdigital Bandpass Filter

Bandpass filter is a device that can be used in both transmitter and receiver in several communication systems, such as mobile phones, terrestrial network, satellite communication and many other applications. In this paper inter-digital bandpass filter with under coupled quarter wavelength resonator is proposed. In this paper, the authors studied the quality factor of inter-digital bandpass filter and showed the effect of center frequency and bandwidth on Q-value. Q is proportional to a dominant resonator dimension and can be sensitive to manufacturing processes as well.