Wideband microstrip bandpass filter based on modified parallel-coupled line topology

Compact, Frequency-Reconfigurable Filtenna With Sharply Defined Wideband and Continuously Tunable Narrowband States

“…A compact frequency-reconfigurable filter was developed based on the wideband, bandpass filter design methodology given in [23,24]. The composite design is depicted in Fig.…”

“…The optimized design parameters are listed in Table I. The composite filter design is composed mainly of a C-shaped narrowband resonator [23], an E-shaped wideband resonator [24], two parallel-coupled transmission lines, and a 50-ohm input/output microstrip line. The E-shaped wideband resonator is located halfway between the input and output ports.…”

A tunable broadband bandpass filter based on quarter wavelength resonators

“…[1][2][3][4][5][6][7] As the key component of the UWB systems, the broadband bandpass filter (BPF) was also attracted a lot of attention. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] In order to meet the application requirements in different electromagnetic environments in different places and times, the demand for the tunable broadband BPF with the center frequency and bandwidth can also be adjusted according to actual requirements was proposed. [12][13][14][15][16][17][18][19][20] In documents available, the tunable broadband BPF was mainly consisted of special resonator structures such as the tunable BPF based on liquid-crystal.…”