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New configurations of folded and compact planar ultra-wideband filters with source- load cross coupling and impedance stubs are presented. Stepped impedance resonators and coupled-line sections as inverter circuits form the basic filter structures. High-low impedance lines connect individual resonators. Effective techniques such as open-stub lines and source-load cross coupling are utilized in order...
The compact coupled-line bandpass filters with two capacitive cross-couplings to create four transmission zeros are proposed. The locations of transmission zeros can be adjusted by varying the values of cross-coupled capacitances so as to improve the filter selectivity. To demonstrate the concept of multiple cross-couplings, a 4th-order microstrip coupled-line bandpass filter with four transmission...
In this paper, the miniaturized microstrip interlocked-coupled bandpass filters are proposed. With the proper utilization of folded quarter-wavelength stepped-impedance resonators, the occupied area of coupled-resonator pair may be reduced. In order to introduce two transmission zeros near the passband, an additional open-stub section is inserted between the low- and high-impedance lines of the resonators...
In this paper, multiple stacked capacitively-loaded coupled lines are adopted for the design of microstrip filter. The filter shows different stopband behavior with respect to even or odd total number of resonators. The transmission zeros may be located around the lower, higher, or both sides of the passband's skirt. Moreover, the use of capacitively- loaded lines can produce another transmission...
A novel triplexer is proposed in this paper. This triplexer is not only employ the multilayered structure to miniaturize the size of the circuit, but also involve the transmission zeros to improve its performance. The design example is also provided in this paper. Excellent agreement between measurement and simulation are obtained, which has been evidenced the feasibility of the configuration.
We have developed an ultra-narrowband high-temperature superconducting (HTS) filter with a fractional bandwidth of 0.14% in the 7 GHz band. To realize a filter with which a narrow bandwidth and low insertion loss are compatible, resonators with high unloaded Q (Qu) value are required. Hairpin microstrip resonators with 2.5 times wavelength were adopted to suppress the radiation loss and realize a...
Based on multi-path design, a new method is proposed for design of stepped- impedance low-pass filters (LPFs) with improved attenuation levels and rejection bandwidth by creating transmission zeros. In a third-order circuit, an extra short microstrip section is introduced to shunt with the low-Z section and provides a second signal path. Two-port network analysis is formulated to predict the zeros...
A novel compact microstrip three- pole dual-band bandpass filter is developed with remarkably improved stopband characteristics. Two square open-loop resonators are embedded in a U- shaped resonator to achieve a significant size- reduction of the filter. Meanwhile, microstip open stubs as well as a cross-coupling between nonadjacent resonators are exploited to produce multiple transmission zeros in...
A novel bandpass filter using the cascaded CPW/slotline ring resonators with tapered step impedance CPW fed structure is proposed. This fed structure not only provides two transmission zeros for the bandpass filter at the lower and upper passband edges but also makes the filter with very compact size. The CPW/Slotline ring resonators utilize a pair of anti-coupled lines to create poles. Moreover,...
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