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Microstrip multi-band bandstop filters using tri-mode equilateral triangular patch resonator are developed, and the rules of resonant frequency and patch defection dimension are obtained by calculation. With fractal patch defection and a higher substrate permittivity, higher order modes of resonator are activized for the multi-band implementation, and the dominant mode TM1,0,-1, and the higher order...
Currently, miniature microstrip filters with dual-mode operation have been widely studied and reported, however, numerous higher order modes are seldom used for a filter design. Multi-mode technique is regarded as one of the most effective methods for a bandpass filter with wideband and miniaturization implementation. This report presents bandpass filters with higher order mode and multi-mode operation...
Triangular patch resonator bandpass filters with tunable operation are developed to perform nicer filter properties of low passband insertion loss, transmission zeros and wide stopband. With tunable fractal-shaped defection acts as perturbation, filter operation frequency and operation band can be controlled, and the responses of undesired resonant modes are greatly weakened even suppressed. The new...
Multi-mode technique has very important application in microwave filter design for implementing miniaturization, wide band and nicer performances. This report presents a new multi-mode bandpass filter with wide passband by using single isosceles right-angled triangular resonator which with much less attention, and transmission zeros and low passband insertion losses are obtained. The new filter has...
In this paper, novel fractal-shaped microstrip bandpass filters with one isosceles triangular defected cell and double defected cells using isosceles right-angled triangular resonator are presented, and their filter performances are calculated and optimized. Using etched fractal-shaped defections in patch, the proposed bandpass filters with a wide passband of about 1.48 GHz, and dual passband centered...
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