DESIGN OF RECONFIGURABLE MINIATURIZED UWB- BPF WITH TUNED NOTCHED BAND

A new miniaturized ultra-wideband bandpass fllter with embedded reconflgurable multiband frequency notch function was designed and implemented by embedding all the passive components into a printed circuit board with a high dielectric constant. The proposed fllter consists of compact 2U-shaped DGS resonators shunt connected to parallel coupled lines to achieved frequency notch. To tune the notched band, suitable capacitor elements within the inner/outer U-DGS and RF PIN diode within the outer U-DGS are integrated. A curve fltting formula is derived to show the efiect of the capacitor value on the center frequency of the notched band, which is decreased by 56.7%. These capacitors improved the quality factor and have the efiect of reducing the fllter size by 72% as compared to other fllters. The RF PIN diode in the outer U-DGS acts as a switch to exhibit a band notch covering the bandwidth of the WLAN for IEEE 802.11a/h at 5.5GHz and RFID ISO 18000 series pars 5 in microwave (MW) which is set at 5.8GHz, 6.1GHz and 6.8GHz, and the other bands. RF PIN diodes control the notched band and raises it from 5.25GHz to 6.85GHz (27%) or remove the band notched according to its positions. In order to validate the feasibility of the proposed structure, UWB BPF with center frequency of 6.85GHz is designed, fabricated, and measured. The fllter has passband from 3.2GHz to 10.7GHz and notched band designed to generate stop band from 5.25 to 6.85GHz, and the two transmission zeros are observable at 2GHz and 12.5GHz, respectively by measurement. This paper shows the