Design and Development of Dual-band Band-Pass Filter

The demand for dual-band or multiband systems is tremendously increasing in modern wireless communication. This is because the dual band or multiband filters reduces the circuit size by employing a single or common configuration for multiple operation or application. In this project, you will design and develop novel, low cost and compact microstrip Dual Band Pass Filter for microwave/wireless systems with simple physical topology, single-layer configuration, and broad stop-band.

A dual bandpass filter (DBPF) is used to pass two different frequency band signals and to attenuate the other out-of-band unwanted signals. To work in RF/microwave frequency range, the microstrip technology is a very good candidate, which has also the property like the compact size and lightweight. Microstrip is nothing but a substrate or dielectric sandwiched between two thin conductors (of thickness in the range of millimeters or micrometers). The filter network or configuration uses the property of inductor (with the increase in frequency, impedance increases) and capacitor (with the increase in frequency, impedance decreases) to achieve the proper operation. In microstrip technology, the inductor and capacitor can be designed by using narrow and wider microstrip conducting lines respectively over the top plane. The circuit can be fabricated by using a simple etching process. The main aim of this project is to design a DBPF for 2.4/5.2 GHz WLAN application with wider stop-band up to 10GHz.