Novel Miniaturized Bandpass Filters Using Spiral-Shaped Resonators and Window Feed Structures

Dai, Guang; Xia, Mingyao

doi:10.2528/pier09120401

Cited by 30 publications

(30 citation statements)

References 17 publications

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“…Some papers show that the filter's characteristics are a consequence of general network configurations, like [3] that demonstrated that the parallel connection of the two port networks has features that can be used for designing microwave BPFs, or [4] that shows that the using of a 0 • feed structure creates two extra transmission zeros at the frequencies close to and on the opposites of the passband. A conclusion that some distinctive characteristics of the filters, such as the number and positions of the transmission and reflection zeroes, are a consequence of their topology, can be reached based on the similar characteristics of BPFs described in [5][6][7][8][9][10][11][12][13][14], distinguished by the authors into different kinds and analyzed and designed by different methods. The correlation between the topology and the electrical characteristics is especially noticeable for BPFs with capacitive coupled resonators [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Theory and Realization of Simple Bandpass Filters With Antiparallel Configuration

Jovanovic¹,

Milovanović²,

Gmitrovic³

2013

PIER

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Abstract-This paper introduces a theoretical analysis as well as a design example for bandpass filters (BPF) with a distinctive topology. Based on the analysis of simple two-port symmetrical lossless networks with a parallel structure, a method for obtaining normalized BPF prototypes with desired bandwidths was developed. These prototypes can be scaled to any central frequency and symmetrical real termination in the same way as conventional filters. It is also demonstrated that with a slight modification of the basic BPF prototypes, transmission zeros with controllable frequencies can be introduced in both the lower and the upper stopband region. Such modified prototypes are more convenient for the realization of printed filters than the basic BPF prototypes. The proposed filters have almost identical characteristics in the broad vicinity of the passband region either when composed of ideal lumped elements or of transmission lines (TLs). Due to its simplicity, the proposed concept could be applied for the realization of a printed BPF at a large variety of PCB types, substrates and practical design configurations. A microstrip BPF model is realized for the experimental verification of the presented theory. The measured and theoretical results show excellent agreement, confirming the proposed concept and the exactness of the methodology.

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Section: Introductionmentioning

confidence: 99%

Theory and Realization of Simple Bandpass Filters With Antiparallel Configuration

Jovanovic¹,

Milovanović²,

Gmitrovic³

2013

PIER

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“…Therefore, the multiband filters have been gaining wide attention in recent years. Dual-band filter is the most common multiband filter, which has been analyzed deeply in many articles with various configurations [1][2][3][4][5][6]. The dual-band filters were reported in [4][5][6] using SLR.…”

Section: Introductionmentioning

confidence: 99%

“…Dual-band filter is the most common multiband filter, which has been analyzed deeply in many articles with various configurations [1][2][3][4][5][6]. The dual-band filters were reported in [4][5][6] using SLR. Tri-band microstrip planar filters were also reported in [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…The compact high performance microwave multi-band filters are highly desirable in wireless communication systems. The design of different multi-band filters was discussed by many authors [3][4][5][6][7][8][9], where they proposed multi-band filters, but the configurations still occupied a large circuit area and had complex designs, which are not suitable for wireless communication systems where the miniaturization is an important factor. Therefore, it is desirable to develop new types of dual-band microstrip resonators not only for offering alternative designs, but also for miniaturizing filters.…”

Section: Introductionmentioning

confidence: 99%

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A Very Compact Novel Multi-Band BPF for Recent Mobile/Satellite Communication Systems

Mohamed¹,

El-Shaarawy²,

Abdallah³

et al. 2014

PIER C

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Abstract-This paper presents a novel compact dual-tri bandpass microstrip filter employing meander and open stub loaded resonators. With the proposed technique, a simple transformation from dual-band to tri-band BPF is realized. A novel structure using embedded resonators is designed to generate multiband response. The main resonators control the low-band resonant frequency, the meander resonators control the two high-band resonant frequency and the open stub resonators control the high-band resonant frequency. The meander/stub resonators are embedded into the main spiral resonators, which makes the filter compact where its size is reduced by 64% compared to traditional filters. Passbands improvements and high selectivity are realized by the short circuit stubs which generate additional transmission zeros. The proposed filter has advantages such as low insertion loss, compact size and high selectivity. The theory is validated using the commercial full-wave solver CST 2012. Finally, the proposed structure is implemented and the measurement results are found to be in good agreement with the simulation results.

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“…The choice of the resonator plays an important role for realizing a compact filter. Sub-wavelength structures such as open-loop resonators, splitring resonators (SRRs), miniaturized hair-pin resonators and other microstrip structures have been successfully used to design compact filters at microwave frequencies [5,[13][14][15][16][17][18][19][20][21][22][23], since these resonators can be designed with dimensions much smaller than the signal wavelength at their resonant frequency. Broadside coupled split-ring resonators with cross coupling are chosen to serve the purpose of implementing the multilayer filter compared to the conventional splitring resonators [12] to eliminate the cross-polarization effects [24] and to realize miniaturized structures.…”

Section: Introductionmentioning

confidence: 99%

Compact Two-Layer Microstrip Bandpass Filters Using Broadside-Coupled Resonators

Vegesna¹,

Saed²

2012

PIER B

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Abstract-This paper presents a design methodology for realizing broadside-coupled microstrip bandpass filters on multilayer substrates to reduce the size of the filter. The new filter configuration consists of broadside coupled split-ring resonators on two layers backed by a ground plane. With the proposed new method, miniaturization to a greater extent can be achieved compared to the conventional method of realizing microstrip multilayer filters. In addition, coupling apertures in the ground plane used to achieve coupling among the resonators in conventional multilayer structures are eliminated. The proposed design is more flexible compared to traditional multilayer filters. Layers can be easily added to increase the filter order. To demonstrate the method, a miniaturized two-layered bandpass filter centered at 728 MHz with low insertion loss is implemented and investigated. Miniaturization of more than 25% is achieved compared to the conventional broadside coupled structure and more than 40% miniaturization compared to the edge coupled structure. The new microstrip filter discussed in this paper can be realized using simple fabrication techniques.

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Novel Miniaturized Bandpass Filters Using Spiral-Shaped Resonators and Window Feed Structures

Cited by 30 publications

References 17 publications

Theory and Realization of Simple Bandpass Filters With Antiparallel Configuration

Theory and Realization of Simple Bandpass Filters With Antiparallel Configuration

A Very Compact Novel Multi-Band BPF for Recent Mobile/Satellite Communication Systems

Compact Two-Layer Microstrip Bandpass Filters Using Broadside-Coupled Resonators

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