Design and Development of Dual-band Band-Pass Filter

The demand for dual-band and multiband systems is significantly rising in the field of modern wireless communication. This increase is attributed to the ability of dual-band and multiband filters to reduce circuit size by utilizing a single or common configuration for multiple operations and applications.

In this project, we aim to design and develop an innovative, cost-effective, and compact microstrip Dual Band Pass Filter for microwave and wireless systems. The proposed filter will feature a simple physical topology, single-layer configuration, and an extensive stop-band.

A dual bandpass filter (DBPF) is essential for passing two distinct frequency band signals while attenuating unwanted out-of-band signals. When operating in the RF/microwave frequency range, microstrip technology stands out due to its compact size and lightweight properties.

Microstrip technology involves a substrate or dielectric material sandwiched between two thin conductors, typically in the range of millimeters or micrometers in thickness. The filter configuration leverages the properties of inductors and capacitors: impedance increases with frequency for inductors and decreases for capacitors. In microstrip designs, inductors and capacitors are created using narrow and wider microstrip conducting lines on the top plane.

The circuit fabrication is straightforward, employing a simple etching process. This project aims to design a dual bandpass filter (DBPF) for 2.4/5.2 GHz WLAN applications, featuring a wide stop-band up to 10GHz.