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This paper proposes a multiband bandpass filter using interdigital and step-impedance techniques for 4G, WiMAX and WLAN systems. The step-impedance resonator can controlfundamental and harmonicfrequencies, while the size of resonator can be reduced by using interdigital technique. The multiband includes 2 sets of bands: thefirst set has responses at 1.8 GHz, and 3. 7GHz, and the second set has responses at 2.45 GHz, and 5.5 GHz. The cross coupling technique has been employed to combine all of these frequency bands. The experimental results of the fabricated filter agree very well with simulation expectations using lE3D package. The proposed filter has good performances with resonator size reduction (from Al2 to Al8).

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