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In this paper, the rolled fat monopole antenna with bandstop function for UWB systems is proposed. The proposed antenna has the omnidirectional patterns in azimuth and very small size. It covers 3.1~10.6 GHz band for VSWR < 2, using the rolled monopole structure. The proposed antenna has wide bandwidth and bandstop function of 5 GHz WLAN band limited by IEEE802.11a and HIPERLAN/2. To achieve these...
In this paper, a novel dual-band bandstop filter (DBBSF) is proposed by using composite shunt resonators, and an approximate design method is developed based on the lumped-element circuit of the filter. Both the midband frequencies and the stopband widths of the dual bands of the filter can be controlled separately. A dual-band BSF with center frequencies of 1.7 and 2.3 GHz is designed and fabricated...
A frequency-tunable bandstop filter (BSF) with low reflections, separate stop-bands, and more than one-octave tunable frequency range is proposed. The BSF consists of a pair of frequency-tunable shunt resonant circuits in a balanced configuration, which enables the low-reflection characteristics and a great deal of degree of freedom in its design, such as the separate stop-bands. An X- to Ku-band...
This paper aims to give a unified characterization of various periodically loaded transmission line media/materials with infinite extent on coplanar waveguide (CPW) in terms of two fundamental per-unit-length (PUL) transmission parameters, i.e., frequency-dispersive/complex characteristic impedance and propagation constant. Regardless of varied periodic loading elements, a self-calibrated method of...
In this paper, a novel compact microstrip bandstop filter using complimentary split ring resonators (CSRRs) is proposed. The bandstop is produced by an array of CSRRs etched on the center line of a microstrip. This behavior is due to the presence of negative effective permittivity and positive permeability near resonant frequency which prevent the wave propagation. We have achieved controllable resonance...
In this paper, a novel four-pole microstrip bandpass filter (BPF) with sharp attenuations and wide stopband is developed through a combined use of composite resonators and stepped impedance resonators (SIRs). By using a full-wave electromagnetic simulator, the filter is designed with a midband frequency of 1.0 GHz and a fractional bandwidth of 2%. The measured frequency response of the filter agrees...
This paper focuses on our solutions of filters with high frequency selectivity, extended stop- band, and dual-band operation functions, by means of exploiting the unique properties of composite resonators. First, filters using composite resonators to produce multiple transmission zeros are described. As no cross-coupling between non-adjacent resonators is required, the filters are easy to design and...
The microstrip bandpass filter with wide stopband range is presented. This filter is constructed by inserting the resonance circuit into the coupled capacitively-load lines. Using the resonance circuits to compensate the even- and odd-mode velocity of the coupled capacitively-load lines, the higher-ordered harmonic frequency can be reduced. The 40-dB stopband suppression level is obtained up to four...
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