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Design of a Micro strip Quad-Band Band pass Filter for LTE Using Stub Loaded Resonators

Se.Deiveekaa, J.William

A Quad-band bandpass filter for wireless RF devices is presented. The circuit is capable of serving multiple FDD and TDD bands of the 4G LTE standard. A microstrip transmission line is used to feed stepped impedance resonators for providing four bands in LTE spectrum. The proposed filter is simulated using IE3D simulator. The centre frequency and bandwidth of each passband can be controlled by physical dimensions of resonators. The bands are centered at 1.2, 2.4, 3.2, 3.4 GHz. It has a return loss of -35dB and 0dB of insertion loss. The size of the circuit is 16x16 mm2 . The above filter can be used for wireless applications such as WiFi, WLAN, WiMAX, WCDMA applications.