In this paper a compact simple structure x-band dual mode cavity band pass filter using rectangular waveguide is presented. A cavity resonator is implemented to provide a narrow band pass filter at microwave frequency. Coaxial line probes for excitation is considered. A single cavity resonator is designed to generate a degenerate resonance of two orthogonal modes (TE101 and TE011 ), enabling dual-mode operation. Using dual mode cavities that support twodegenerate resonances reduces the number of physical cavities. This improvement of compact size and weight of the filter are major advantages Also, using cross coupling technique allows to produce transmission zeros near the stop band and hence improving filter selectivity In order to couple of resonators (orthogonal modes), small perturbation by small deformation of boundary is designed. This perturbation can optimize bandwidth of the pass band to desired values. By this technique the bandwidth can be enhanced to more than 6 times of single dual mode structure. Also screw is used for tuning the resonance frequency of dual mode filtering response without disturbing the coupling of the degenerate cavity modes. A prototype is designed to operate at 9050 MHz. Simulated and experimental results are provided. The insertion loss is about 0.5 dB, return loss is better than 12.5 dB and 3 dB fractional bandwidth is about 0.66%.