Very compact differential transformer-type bandpass filter with mixed coupled topology using integrated passive device technology

Micro-Fabricated Resonator Based on Inscribing a Meandered-Line Coupling Capacitor in an Air-Bridged Circular Spiral Inductor

“…A transmission zero appeared at 3.9 GHz with a high suppression level of 38.7 dB. The distributed parameters at 1.627 GHz, extracted from the measured S-parameters, were R = 4.45 Ω, L CS = 1.08 nH, and C C = 0.48 pF [ 23 ].…”

Dual-Band Ultra-Wideband Bandpass Filter with Eight-Resonant Modes and Quad-Transmission Zeros Employing Synchronous-Quasi-Resonance

“…There are various design methodologies on UWB and DWB BPF designs respectively as references for the DBUWB design in this paper [1][2][3][4][5][6][7][8][9][10][11][12]. Either the UWB, DWB, or DBUWB's implementation mainly depends on the sufficient synchronization in the frequency response of both in-band and out-of-band.…”

“…An alternative to this scheme is to utilize a hybrid resonator structure, such as the parallel-coupled stepped-impedance resonator (SIR) presented in [2], which can also ameliorate the design flexibility. Besides, there are also various methods in implementing DWB BPF [3][4][5][6][7][8][9][10][11][12]. First, a cascade connection of a BPF followed by a bandstop filter, in which the latter filter is used to divide the passband into two separate bands, namely dual-band, can be considered as an effective method [3].…”

“…Additionally, for the first time, the concept of UWB and DWB is combined into high-performance DBUWB design meeting both their specifications. Lastly, the TZs generated by the virtual ground effect of the loaded-stubs and the source-load coupling (SLC) result in both strict frequency selectivity and excellent rejectionband performance [8][9][10].…”