Small Integrated Bandpass Filter using two Identical closed Rectangular Resonators on a Capacitive Load for Wireless Communications Systems

This paper presents the study, design and simulation of a narrow-band compact bandpass filter using the technique of rectangular-shaped linear resonators closed on a capacitive load. The topology of the proposed filter is used in an optimal configuration, in order to reduce the size of the filter as well as its selectivity. This filter is for wireless communication systems (Wi-Fi, Bluetooth, RFID and ISM). It is attractive in terms of cost and size (9x7.1) mm
²
, and has a high selectivity in the bandwidth (213 MHz) and a low insertion loss (0.1 dB).