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In this paper, a novel dual-mode resonator is presented, which is a square loop resonator attached by four arrow-shaped patches at the corners. By adding four patches and a perturbation to the square loop resonator, the features of compact size and controllable coupling are obtained. Coupling coefficient of the low modes and that of the high modes can be controlled independently when the dual-mode...
In this paper, a novel compact tri-band filter based on SIR loaded is presented. By adding λ/4 resonators and loading SIR stub, the features of compact size and tri-band response are obtained. Three passbands are designed to operate at 1.85GHz, 2.575GHz and 3.05GHz, respectively. The first and second passbands are obtained using resonator loaded with SIR, which is smaller in size than UIR, the λ/4...
This paper presents a novel approach for designing dual-mode dual-band bandpass filters using capacitance loaded square loop resonators (CLSLR). The CLSLR features compactness and spurious response suppression because of the loaded capacitance. A dual-band response is obtained via an extremely large perturbation in a single resonator and second-order dual-mode dual-band filters are realized by a new...
A loss compensated tunable bandpass filter based on varactor-tuned microstrip square ring resonators is presented, which has a tuning range of 698–802MHz and steep skirt frequency response. The filter employs a PHEMT ATF34143 with appropriate feedback elements acting as a negative resistance circuit which not only reduces the insertion loss but also increases Q-factor significantly. According to the...
A dual-band substrate integrated waveguide (SIW) filter is designed in this paper. This design is based on the frequency transformation from the normalized frequency domain to the actual frequency domain, which can calculate the coupling coefficients and the external quality factors analytically. In the realization, the dual-band resonator is utilized to replace each capacitance in the low-pass prototype...
This paper presents a novel dual-mode filter with asymmetric frequency response making use of square loop resonator DGS. Unlike the conventional dual-mode structure, the square ring resonator with a square patch attached at the corner is placed on the bottom plane, which is coplanar with the defected ground. Two T-shaped orthogonal feed lines are arranged on the top plane, which have an overlapped...
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