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In this paper, direct synthesis technique for a new class of lossy bandstop coupled resonator filters is presented for the first time. It has been verified for various bandstop filters including symmetrical, asymmetrical, and different loss level functions. The results of synthesis show the effectivity of the direct synthesis technique.
Compact ultra-wideband bandpass filter using square-ring resonator with two symmetrical stubs is presented in this paper. A quarter-wavelength resonator is embedded into the square-ring resonator to realize notch-band performance, where the notch-band frequency can be conveniently adjusted by changing the parameters of the embedded resonator, and the attenuation level as well as notch-band bandwidth...
A BPF design method is applied for WPT systems. It has been employed by the present authors mainly because it is clear, decisive and convenient. The present paper deals with the quality of the designed result. The operating bandwidth by the BPF design method has been made maximum with a certain coupling coefficient compared with other methods, which ensures a stable operation robust to the change...
This paper presents a transformer-based coupled resonator structure for a bandpass filter (BPF) using the integrated passive device technology on a glass substrate. The use of such a transformer-based coupled BPF not only provides the advantage of compact size but also creates extra transmission zeros to enhance the roll-off rate or the desired stopband rejection. The measured results verify the validity...
In this paper, a new design method of the dual-band bandpass filter which consists of Stepped-Impedance Resonators (SIRs), Open-Loop Ring Resonators (OLRRs) and feed lines with SIRs is proposed. The length of feed line with SIR electrically becomes half wavelength at the first resonance frequency and one wavelength at the second resonance frequency, and so the size of filter may be reduced. And to...
A dual-band filter has been designed and fabricated using two dual-mode resonators. Current distributions of four modes of this filter are investigated using full-wave electromagnetic simulations. It shows that the folded canonical topology can be realized using the proposed dual-mode filter structure. A dual-band filter is optimized using an analytical procedure and the corresponding coupling matrix...
This paper proposes a fully stacked laminated waveguide dual-band filter in low-temperature co-fired ceramic technology. Taking advantage of the multiple cavity modes, the coupling coefficients and external quality factors for different pass bands are simultaneously achieved by adequately choosing positions of open slots and feeding probes. Besides, the operation bands can be controlled by the geometric...
This paper presents a novel approach for designing lowpass filters using the coupling matrix technique. First, a relationship is established between the coupling coefficients and a surrogate model consisting of lumped elements. Applying a coupling matrix extraction to simulated or measured data, such a surrogate model approximating the characteristics of a planar filter geometry can be created. Comparing...
In this paper, a novel high selectivity compact dual planar microstrip bandpass filter (BPF) with compact ring resonator and two uniquely designed defected ground structures (DGSs) is proposed. By employing the inter-digital and spiral DGSs, the filter selectivity can be significantly enhanced with a wide suppression of higher order harmonics. The filter has a selectivity of 220 dB/GHz, passband insertion...
A bandpass filter with a ultra wide stopband is implemented on a Liquid Crystal Polymer (LCP) with a thickness of 100 µm. The bandpass filter (BPF) is realized in a double-sided structure, of which the top side provides the main filtering characteristics by employing T-shaped resonators and the bottom side provides efficient signal feeding. The filter has been investigated numerically and experimentally...
A novel partly combined two half-wavelength SIR resonators (PCSIR) and its application to tri-band filter are presented in this paper. In the PCSIR, a part of one SIR is loaded in the center of the other SIR. The loaded SIR has the twice geometrical width as the other SIR, but with different length of its high impedance microstrip section. The proposed PCSIR is so constructed that the resonant frequencies...
A bandpass filter based on low-temperature co-fired ceramic (LTCC) multilayered technology with high-order harmonic suppression is presented. By using multilayer coupled stripline resonator structure, utilizing several methods such as increasing loaded capacitance, introducing defected ground structure (DGS), series resonator to ground and tuning Z shape coupling stub, the high-order harmonics was...
This research proposed a novel miniaturized coupled filters at 5.35GHz for WLAN application in duroid-6010 laminate substrate with four layers of metal. In order to reduce length of resonators, the stepped impedance resonator (SIR) theorem have been used. In addition, the coupled filter is designed in multilayer structure by using aperture-coupled. The area of filter in this research is 1mm×3.6mm...
The semi-analytic procedure is provided for tri-band and quad-band filter design based on E-shaped resonators. With analytic synthesized procedure in dual-band filter design and connect two filters using double-diplexing configuration, the tri-band and quad-band performances can be achieved. The simulated results for the synthesized filters agree well with the ideal performances after some fine tuning...
A novel structure for designing a dual-band bandpass filter(BPF) using asymmetrical stub-loaded resonators(SLRs) with independently controllable center frequencies and bandwidth is presented in this paper. By appropriately selecting the length of the SLR, the harmonic frequencies can be tuned for generating the dual-passband response. Using this structure to the filter, the bandwidth of each passband...
This work presents a methodology for the prediction of fabrication yield in band-pass Butterworth direct-coupled cavity filters. The sensitivity of the reflection parameter with respect to coupling coefficient variations is calculated in the low-pass prototype. From this value, the maximum degradation experienced by the reflection parameter in a worst-case scenario is given. A practical application...
In this paper, we present an effective technique to miniaturize a substrate integrated waveguide (SIW) bandpass filter by using a double-sided complementary split ring resonator (DS-CSRR). With the proposed technique, the proposed DS-CSRR SIW filter provides a lower resonance frequency compared to a conventional complementary split ring resonator (CSRR) SIW filter thanks to the coupling effect between...
In this paper, a microstrip bandpass filter for a UHF 900 MHz Band is remarkably miniaturized and its performance is enhanced using the metamaterial(MTM) Zeroth Order Resonator(ZOR) characteristics. Firstly, we propose each of the resonators for a bandpass filter is implemented by a one-cell ZOR, and the coupling between neighboring different ZORs is controlled to meet the primary goal on the bandpass...
This paper presents a new type of microstrip quasi-elliptic function bandpass filter built in parallel feed configuration with a pair of open-loop dual-mode resonators. By employing this new coupling scheme, it is flexible to implement different single- or dual-band filtering characteristics. As an example, a three-pole quasi-elliptic function filter of this type with a finite-frequency transmission...
This paper presents a planar dual-band bandpass filter based on a novel embedded resonator concept. The proposed filter employs four sets of resonators embedded inside the conventional open loop resonator to generate two passband responses without affecting the filter's size. Two pairs of embedded resonators are electromagnetically cross coupled to generate the required passbands. The proposed technique...
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