Design and Analysis of Multi-Band Filters Using Slot Loaded Stepped Impedance Resonators (original) (raw)
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Design of Compact Microstrip Stepped-impedance Resonator Bandpass Filters
Procedia …, 2011
This paper presents the resonator bandpass filter design using the proposed stepped-impedance resonator technique. The proposed resonator is consisted of a quarter wavelength coupler with the stepped-impedance connected at the end of the lines. Each ports have a step impedance feed line to adjust the impedance of filter closed to the characteristic impedance Z 0. This resonator can reduce the spurious response at 2f 0 and 3f 0. The experimental results and designs of all types are 0.9 GHz to implement bandpass filters. This filter can suppress the second and third spurious response that both the theoretical and experimental performance is presented.
Compact multilayer dual-band filter using slot coupled stepped-impedance-resonators structure
Microwave and Optical Technology Letters, 2009
In this article, a new miniaturized configuration of singleinput-single-output dual-band bandpass filter operating at ISM 2.45 GHz and UNII 5.8 GHz frequency bands using a multilayer structure with stepped-impedance resonators is presented. A coupling aperture is introduced in a common ground to ensure the coupling between the two resonators located in the upper layer and the lower one. The use of stepped-impedance resonators allows tuning the two bands at desired frequencies. Finally, a design prototype was fabricated to validate the proposed concept. The insertion loss and return loss at the central frequency are Ϫ1.35 dB and Ϫ17 dB for 2.45 GHz band, and Ϫ0.98 dB and Ϫ13 dB for the 5.8 GHz band, respectively. There is a good agreement between experimental and full-wave electromagnetic simulation results.
International Journal of Engineering Sciences & Research Technology, 2014
A new class of compact microstrip multiband bandpass using symmetric U-shape with triangular stepped impedance resonator is proposed for wireless application. The multiband filter only employs two symmetric U-shape with triangular stepped impedance resonator. By properly tuning the impedance ratios and length ratios of stepped impedance resonators, a multiband filter response can be achieved easily. Based on the similar characteristics of triangular shaped SIR, a miniaturized multiband band pass filter operating at the center frequencies (0.8GHz, 2.3GHz, 3.8GHz, 5.1GHz and 5.8GHz) are obtained. The filter is characterized by analyzing the filter parameters return loss and insertion loss. The numerical analysis of the proposed filter is derived by using commercially available electromagnetic simulation software IE3D. The results show that the filter has compact size, good return loss and insertion loss characteristics.
APCC/MDMC '04. The 2004 Joint Conference of the 10th Asia-Pacific Conference on Communications and the 5th International Symposium on Multi-Dimensional Mobile Communications Proceeding
This paper presents the superiority of designing microstrip line Multi-frequency band Wters with a single. ' input and a single output. Utilizing the S-parameter of a two-porI network and the ABCD matrix parameters for the analysis of short-cimited and open-circuited resonators with various combinations of series and shunt sequences, Multi-frequency hand resonators are proposed based on the stepped-impedance'resonator (SIR) structure. With the idea of the impedance ratio of the resonators, the center frequency of the two passband is determined. Using transmission line connections of suitable characteristic impedances and the monators by the binomial coefficient admittance values, the dual-band effect is obtained. Binomial coefficient admittances of resonators are chosen for higher order dual-band fdter design and simulation, From the experimental results, the bandwidth is SOOMHz to the least extent, the insertion loss is less than I d 5 within the passband, and more than 50dB attenuation is permitted within 1.4GHz from the center frequencies of the two passband. The method can be applied to any other multi-frequency bands, then 5.2 GHZ and 2.4 G& filter was designed as example.
Compact microstrip band-pass filters based on semi-lumped resonators
2007
A new design approach for compact microstrip band-pass filter based on semi-lumped resonators are proposed. The resonators, which are coupled through quarter wavelength meander lines acting as admittance inverters, are shunt connected to the line. They consist of parallel combination of a grounded (inductive) stub and a narrow metallic strip followed by a capacitive patch to ground. With this topology, the necessary degree of flexibility to design narrow and broad-band-pass filters with compact dimensions and good out-of-band performance was obtained. Another key advantage of the devices, as compared to previous lumped or semi-lumped elementbased structures reported by the authors, is the absence of ground plane etching. To illustrate the potentiality of the proposed approach, a third-order (30% fractional bandwidth) and a nineth-order (35% fractional bandwidth) Chebyshev band-pass filters have been designed and fabricated. The measured frequency responses are very symmetric and exhibit low in-band losses as well as good out-of-band rejection up to approximately 3f o. Filter dimensions are as small as 0:40l  0:12l (third-order prototype) and 0:62l  0:16l (nineth-order prototype), l being the guided wavelength at f o. With these dimensions and performance, and the possibility to synthesise microstrip filters with controllable bandwidth over a wide margin, it is believed that the reported approach can be of actual interest for the design of planar filters at microwave frequencies.
A dual-band bandpass filter with wide and highly attenuated stopbands is designed using parallel coupled microstrip line (PCML) and stepped-impedance-resonators (SIRs). The proposed filter is composed of a pair of highly coupled PCML-SIR structure and a central resonator using a low impedance rectangular microstrip. Initially, the wide dual-band performance is achieved by creating a transmission zero between those two bands using a tightly coupled PCML-SIR with a suitable impedance ratio. Then, a low impedance resonator is placed between the pair of PCML-SIR to generate multiple resonant frequencies for a broadband performance. The simulated and measured results of those filters agree very well. The bandwidth of the first band in the developed filters extends from 1.75 GHz to 3.75 GHz with less than 0.3 dB insertion loss at the center of the band. The second band has a bandwidth that extends from 6.95 GHz to 8.75 GHz with less than 0.5 dB insertion loss at the center of that band. The stopband separating those two passband has more than 30 dB attenuation with transmission zero at 5.85 GHz.
Design and Analysis of Microstrip Low Pass and Bandstop Filters
Regular Issue, 2019
In this paper a simple approach of designing the microstrip low pass and bandstop filter is presented. The microstrip stub based low pass filter with 2.4 GHz and attenuation of more than 60 dB at 4 GHz frequency is designed. The bandstop filter is also designed with notch characteristics at 2.4 GHz frequency. The fractional bandwidth of designed filter is estimated to be 30% with 117 dB of attenuation is recorded at notch frequency of 2.4 GHz in SIR based bandstop filter topology. The bandstop filter is implemented using coupled line structure as well as step impedance resonator techniques. The filters are designed on Roger RC40003C substrate. The design and analysis of filter with its layout and EM simulation is accomplished using Agilent ADS software. These filters can be used in front end transceiver systems, antennas, and modern wireless communication systems.
2017
Filters are the basic part in wired, and wireless telecommunications and radar system circuits and they play an important role in determining the cost and performance of a system. The increasing demand for high performance in the fields of RF, WLAN, WiMAX and other wireless communications led to the great revolution in the advancement of the development of a compact microstrip resonator filter design. All these have made a vital contribution to both the required performance specifications for filters and other commercial requirements in terms of low cost, large storage capacity and high-speed performance. This review paper presents several design examples for multi-band, multi - mode microstrip filter resonators to satisfy RF, WLAN, WiMAX, UWB and other wireless communication frequency bands. To analyse the resonant frequencies odd - mode and even -modes can be used for the symmetrical structure. In general, the multi-mode resonators can be designed by using different methods like c...
Design of Cross-Coupled Planar Microstrip Band-Pass Filters Using a Novel Adjustment Method
2015
In this paper the design of a cross-coupled planar microwave band-pass filter using open-loop square microstrip resonators, with two symmetrically placed attenuation poles, is presented. The design starts from the following specifications: central frequency 3GHz, 150MHz bandwidth, 1dB ripple in the pass-band corresponding to return loss of 6.8dB.The adjustment method using additional ports placed on each resonator of the filter is used, allowing the interconnection of the filter structure with external lumped elements. Connecting a reactive element (capacitor) from such an additional port to ground allows a fine tuning of the resonator. Connecting a reactive element between two such additional ports allows a fine change in the coupling coefficient between these resonators. After adding four extra ports and connecting the external elements (capacitors), it is possible to use fast circuit simulation software to optimize the filter's response. Then all these capacitors have to be gradually eliminated, by compensating their effects through fine changes back in the layouts. If some specific issues are properly handled, this procedure improves considerably the quality of the final design of the filter. After a thorough optimization of the layout, the filter was fabricated and measured. The results of measurements are in good agreement with the specifications of the filter, showing this way the efficiency of the applied optimization method.