Microwave filters are generally designed to operate in the frequency range from megahertz (MHz) to gigahertz (GHz). Filters are used in many applications such as broadcasting, television and wireless communications.Thus, these microwave devices need a filter that will decide which signals will be transmitted or received. Today, most designers still have difficulty in designing a filter that provides high performance, matched response, low weight and compact at the same time. In this paper, a dual mode band-pass filter is designed and simulated. The filter design was performed using stepped impedance resonator. The substrate used is Rogers RT5880 with a dielectric constant of 2.2 and a thickness of 787μm. The proposed topology have a total electrical length of 120° and a performance that gives a first spurious resonant frequency at 5.2 times the fundamental resonance frequency. We then incorporated the capacitive element C3 into the topology of the band pass filter in order to achieve the design of the quasi elliptical band pass filter. Transmission zeros and a much narrower transition band are seen at the quasi-elliptical dual mode bandpass filter. The center frequency is at I GHz and there are two transmission zeros in S12.