Stepped impedance low pass filter using microstrip line for C-band wireless communication

Wireless communication systems, satellite communication and radar systems are generally used low pass microwave filter for frequency selection. The low pass microwave filters are essential for reject harmonic components which are above cut off frequency. High impedance and low impedance microstrip lines are used in stepped impedance microwave filter design. In this proposed filter describes the design of C-band microstrip line low pass filter. In this paper we have choose the bandwidth of 4GHz and implemented with FR4 substrate. Relative permittivity is 4.2 with a thickness of 62 mil for 6th order low pass filter. I have achieved the cut off frequency 4.010GHz for −3dB. The return loss is greater than −47 dB. The proposed low pass stepped impedance microwave filter describes the designing of Butterworth approximation and cut off frequency at 4GHz with an realization of microstrip line. This low pass filter design is simulated by Advanced Design System (ADS) software.