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In order to obtain triple-passband filters with much wider fractional bandwidth, a doubly coupled structure with tri-section stepped-impedance resonators(TSIR) in each coupling path is proposed in this paper. This structure has the advantages of a much wider fractional bandwidth in the higher passbands without sacrificing the passband's insertion losses. To verify the design concept, a 1.0/2.4/3.6GHz...
This paper proposes miniaturized band-pass filters with folded substrate integrated waveguide (FSIW) resonators using multilayer low-temperature co-fired ceramic (LTCC) technology. The FSIW resonator is used for the circuit size reduction with its footprint about a half of the conventional TE101 mode. With LTCC technology, it is more flexibility to organize the cavities of filters because of the 3-D...
In this paper, a novel ultra-wideband band-pass filter (UWB-BPF) is designed with the ring slot resonator (RSR), which is a hybrid micro-strip and ground slot resonator structure to yield a broad pass-band filtering characteristic. Using the modulated micro-strip stubs and a pair of slits etched on the RS R cell, the poor selectivity and almost no suppression at the upper spurious pass-band ca n be...
A novel compact microstrip bandpass filter with two transmission zeros based on open stub-loaded triple-mode resonator is presented in this paper. By analyzing the characteristics of open stub-loaded triple-mode resonator and its inherent transmission zeros which can be easily moved by changing the length of stub-loaded lines, a bandpass filter is designed, fabricated and tested. In order to achieve...
A resonator using shear waves of lithium niobate is used in this paper to achieve large fractional bandwidth BAW filter. Electromechanical couplings in the 20 − 50 % range are obtained for the shear waves of a thin layer of Lithium Niobate suspended on a silicon substrate. By this way a filter with fractional bandwidth over 20% has been designed for space applications.
In this letter, a novel compact and high selectivity microstrip filter with source-loaded coupling is proposed using miniaturized dual-mode resonator. The resonator can generate one odd-mode and one even-mode in the desired band. Two resonant frequencies can be adjusted easily to satisfy the bandwidth of the BPF. A transmission zero is created near the lower cut-off frequency due to the main path...
A miniaturization technique for microstrip square open loop resonators is presented in this paper. The method is based on the capacitive loading of the resonators. The effect of this technique on the coupling between resonators is studied as well as the effect on the quality factor of each resonator. A 1 GHz bandpass filter is designed, simulated, and built in order to test this technique. The final...
A new topology for fourth-order microstrip bandpass filters is investigated in this paper. Compared to the classical quadruplet, the proposed new topology offers an extra coupling between two resonators, allowing this way the design of fourth order filters with two attenuation poles situated on the same side of the passband. A strongly asymmetric transfer characteristic can be obtained by a proper...
A novel planar dual-mode elliptic-function microstrip bandpass filter with two triangle corner cuts and a square notch is proposed, and the performance of the designed filter is studied in detail. The proposed filter structure uses a single patch without coupling gaps. The center frequency is about 2.13 GHz. The 3 dB fractional bandwidth is 9.86%, and the minimum insertion loss in the passband is...
The increasing inclusion of new types of electrical equipment for evaluation for the public and private health services in Brazil is a reality. Often the siege of the suppliers is crucial on the managers' decision making process to incorporate different technologies. Following from this fact, there are several issues that may be disadvantageous to health units when its managers choose to incorporate...
In this paper, we propose a hexagonal microstrip dual - mode band pass filter by optimizing various geometrical parameters associated with the filter geometry using IE3D full-wave simulation software. The response of the optimized filter is studied and analyzed and the results have been reported. Work also explores the possibility of changing the type of the filter response from Elliptical to Chebyshev...
An original filter-antenna module has been designed, manufactured and measured. The module can be viewed as a high order filter in which the last resonator has been replaced by a resonant antenna element. This antenna is coupled to the other resonators by means of two inter-cavity slots. The module was manufactured using the Substrate Integrated Waveguide technique, which allows the cavities to be...
In this paper a novel result for phase noise oscillator is presented. A four pole elliptic band pass filter is used to decrease the phase noise. The phase noise oscillator with RT/Duroid 5880 substrate with ϵr = 2.2, h = 31 mil at offset frequencies 100 KHz and 1 MHz is equal to -122 and -140 dBc/Hz, respectively, and is -128 and -146 dBc/Hz for GaAs substrate with ϵr = 12.90 and h = 100 μ m in the...
A simple and fast coupling matrix synthesis technique to directly synthesize generalized bandpass filters of arbitrary bandwidth is briefly discussed in this paper. Unlike those well-known coupling matrix synthesis techniques for generalized Chebyshev filtering function that are only accurate for narrowband filters, the technique is this paper can be used to synthesize filters of arbitrary bandwidth...
An efficient method for designing multi-band filters with compact size, high selectivity, and multi-order spurious mode suppression has been proposed in this paper. The design concept is to add some extra coupled resonator sections in a single-circuit filter to increase the degrees of freedom in extracting coupling coefficients between resonators and, therefore, the filter is capable of realizing...
This paper presents the design and implementation of higher order bandpass filters using the published compact quadruple mode resonator. The resonator is further analyzed using odd and even mode analysis along the symmetrical plane of the resonator. The current distributions of the four resonant modes are given for the analysis of the two even mode and the two odd mode frequencies. Approximate expressions...
This paper propose a bandpass filter structure for improved harmonic suppression in the stopband and let the area become smaller. This filter is designed by the half-wavelength microstrip line, and its operating frequency is at 3.4GHz. The operating frequency properties in the WiMAX band are achieved. The filter is composed of two E-type resonators, which are improved from the open-loop resonator...
This article reviews advanced synthesis techniques for the design of microwave filters and multiplexers. In particular, the design of multiband bandpass filters and compact multiplexers is detailed and illustrated with circuits studied for novel satellite equipments.
A first reported ultra-comapct 77-GHz CMOS on-chip bandpass filter (BPF) fabricated in TSMC 0.18-µm standard CMOS process is presented. The U-type dual-spiral resonators are utilized to reduce the size of the filter. The extra transmission zero is generated by the tapped-line input/output feed structure. The transmission zero at the lower stopband is located at 57 GHz. The selectivity of the proposed...
A compact ultra-wideband (UWB) bandpass filter (BPF) with well matched characteristics is proposed in this paper. The BPF consists of weakly-coupled stepped impedance resonators (SIRs) and parallel-coupled lines. Firstly, the performances of the coupled SIRs were examined, and their results show the broad bandpass characteristics with sharp attenuation slope. Next the bandpass performances of the...
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