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Dual-Mode Dual-Band Ring Resonator Bandpass Filter With Transmission Zeros
(2010-01-01)
Kuo, Jen-Tsai
;
Lin, Tsu-Wei
;
電信工程研究所
;
Institute of Communications Engineering
Dual-mode dual-band bandpass filters are developed based on a single ring resonator. The ring is composed of two half-wave stepped-impedance resonators with short-circuited ends, which are connected to ground vias by short high-impedance sections, providing inductive coupling between the resonating modes and hence bandwidth control. Experimental filters are fabricated and measured for validation. Skew-symmetric feed structure is employed in the first circuit for enhancing the frequency selectivity around the second band. Source-load coupling is incorporated with the second design to create transmission zeros on both sides of the two passbands, greatly improving the performance in transition bands. The measured results show good agreement with the simulation.
Ultra-Compact Shorted Ring Resonator Bandpass Filter With Wide Upper Stopband
(2014)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
An ultra-compact second-order bandpass filter with stopband extension is implemented with shorted ring resonators. In the design, the two resonances of the structure are separately controlled by electric and magnetic coupling between the rings. Two transmission zeros on both sides of the passband are created through the multipath effect between the 1/0 ports. Circuit miniaturization is accomplished by attaching an open low-impedance stub to each shorted ring. The upper stopband with a rejection better than 30 dB is extended to 4.32 times the passband frequency. The circuit area is only 8.8% of that of a conventional dual-mode ring resonator filter. Measured results show good agreement with the simulation.
New Miniaturized Ring Resonator Bandpass Filter With Wide Upper Stopband
(2013)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A new configuration for ring resonator is proposed for bandpass filter design with size reduction and stopband extension. The planar self-coupled ring is twisted at its middle and a short CPW section is implemented in the ground plane for the three-dimensional interconnection. The resonator has two resonance modes and the filter possesses one transmission zero on the high side of the passband. With a pair of open low-impedance stubs attached to the ring, the circuit has an area of only 9.65% of that of the conventional ring resonator filter, and the upper stopband is extended up to higher than five times the center frequency. Measured results of a fabricated prototype circuit show good agreement with the simulation.
Miniaturized Microstrip Quadruple-Mode Ring Resonator Filter With Quasi-Elliptic Passband
(2013)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A compact quadruple-mode ring resonator is proposed for synthesis of a quasi-elliptic bandpass filter. The resonator is composed of four half-wavelength rings connected to a single grounded via. For miniaturization, the ring areas are overlapped and the crossovers are implemented by short CPW sections in the ground plane. As a result, the resonator uses about 50% area of a conventional dual-mode ring resonator filter. Among the four rings, all coupling coefficients are of inductive type realized by shorted high-impedance and coupled-line sections. Two zeros are created by capacitive source-load coupling, and the response is synthesized by the coupling matrix method. Agreement between simulation and measurement results of a realized circuit validates the approach.
Miniaturized Dual-Mode Ring Resonator Bandpass Filter with a Wide Passband
(2014-01-01)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Tang, Shao-Chan
;
Chung, Shyh-Jong
;
傳播研究所
Dual-mode ring resonator filter is designed to have a relatively wide passband with a miniaturized circuit area. The miniaturization is achieved by folding the ring trace to a spiral configuration. The two degenerate modes are split up by an asymmetric inductive perturbation. As a result, the circuit area is only 29% of that of a conventional ring. The strong I/O coupling required by the wide passband property is implemented by adding an impedance transformer for matching the external quality factor (Q(ext)) with the circuit bandwidth. Measured results show good agreement with the simulation.
Miniaturized Dual-Mode Spiral-Ring Resonator Bandpass Filter
(2012)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A dual-mode ring resonator filter is devised to have a miniaturized size and its performance investigated. By placing an inductive perturbation at an asymmetric position, with respect to the input and output ports, two transmission zeros are created on the both sides of the passband. The miniaturization is achieved by folding the microstrip ring trace into a spiral configuration, incorporating with metallic via-holes and coplanar waveguide sections as the interconnection. The circuit size is only 20.5% of that of a conventional ring resonator. Measured results show good agreement with the simulation.
Dual-Mode Ring Resonator Bandpass Filter With Asymmetric Inductive Coupling and Its Miniaturization
(2012-09-01)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
Dual-mode ring resonator filters are implemented with asymmetric inductive perturbation for creating transmission zeros on both sides of the passband. In analysis, dependence of the resonance modes and the zeros on positions and sizes of both the inductive and capacitive perturbations is investigated. Under certain conditions, the even- and odd-mode frequencies for a capacitively perturbed ring are the same as the odd and even ones, respectively, for a ring with inductive perturbation. Theoretical background is clearly explained how the two transmission zeros are split up from the center frequency. Two dual-mode ring resonator filters are fabricated and measured for demonstration. To obtain a miniaturized circuit area, the 1-lambda ring trace is folded into a double-ring or spiral configuration. The inductive perturbation is chosen as the crossover and implemented by a short high-impedance coplanar waveguide interconnection in the ground plane of the microstrip. Measurement results show good agreement with the simulation responses.
Quadruple-mode coupled-ring resonator bandpass filter with quasi-elliptic function passband
(2008-03-01)
Lok, U-Hou
;
Chiou, Yi-Chyun
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
Quadruple-mode coupled-ring resonator is used to design quasi-elliptic function bandpass filters (BPFs) with a relatively wide bandwidth. The resonator consists of a pair of coupled rings with two open stubs symmetrically tapped to the inner ring. The stubs are used to move a transmission zero near the center frequency to lower transition band. It is believed that it is the first ring resonator BPF-based on the coupled-ring to create four transmission poles and four transmission zeros. Two filters with relative bandwidths of 10% and 15% are fabricated and measured. Good agreement between simulation and measurement is obtained.

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🏛️國立陽明交通大學機構典藏

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