UWBBPF Using DGS and RF PIN Diodes IJENS（UWBBPF利用DGS和射频PIN二极管ijen）.pdf

International Journal of Engineering Technology IJET-IJENS Vol:14 No:0 1 19 Reconfigurable Compact Dual Mode Resonators UWB-BPF Using DGS and RF PIN Diodes 1 2 1 3 Hesham. A. Mohamed , IEEE Member, Heba B. El-Shaarawy , Esmat. A.F. Abdallah , and Hadia El-Hennawy  Abstract— High-selectivity microstrip wideband bandpass filter with two transmission zeros using DGS and PIN diode concepts is II. STRUCTURE OF THE DUAL MODE RESONATOR proposed. The bandwidth and locations of the transmission zeros The structure of the proposed dual-mode resonator was initially can be adjusted by changing the characteristic impedance of open analyzed in [5-7] , which consists of a microstrip resonator with stub and coupling coefficients of the dual mode resonators. A internal coupled lines and quarter-wavelength open-circuited prototype of planar wideband bandpass filter with 3-dB fractional bandwidth 63% (1.84 - 3.43 GHz) is designed and fabricated. The stub, as displayed in Fig.1(a), where Y ,  , Y and  denote 1 1 3 3 proposed filter topology employs RF PIN diodes as the switching the characteristic admittances and electric lengths of the device.