Multilayer folded-waveguide dual-band filter

Alotaibi, Sultan; Hao, Zhang‐Cheng

doi:10.1109/mwsym.2008.4632936

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…The rapid development of wireless communications technologies has placed increasing demands on multi‐functional radio frequency (RF) systems. As one of the key components of wireless systems, multi‐band/dual‐band filters have been widely studied in recent years . Several methods have been adopted to design dual‐band filters .…”

Section: Introductionmentioning

confidence: 99%

“…Dual‐band filters can also be realized with cross‐coupled resonators. In this approach, a wide passband is split into 2 sub‐bands by introducing transmission zero(s) . This approach is generally suitable for dual‐band filter with a narrow passband separation.…”

Section: Introductionmentioning

confidence: 99%

“…As one of the key components of wireless systems, multi-band/dual-band filters have been widely studied in recent years. [1][2][3][4][5][6][7][8][9][10][11][12] Several methods have been adopted to design dual-band filters. [1][2][3][4][5][6][7][8][9][10][11][12] A simple and direct approach is to combine 2 single-band filters in parallel.…”

Section: Introductionmentioning

confidence: 99%

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High-order dual-band superconducting filter with independently controllable passbands and wide stopband

Guo

Luo

et al. 2018

Int J RF Microw Comput Aided Eng

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A stepped‐impedance‐stub loaded stepped‐impedance resonator (SISLSIR) is proposed to design a dual‐band bandpass filter. The even‐ and odd‐mode frequencies and the coupling strength of the proposed resonators can be independently designed and adjusted. A dual‐feedline structure is used to meet the required external couplings of the 2 passbands. Thus, both the center frequencies and the bandwidths of the 2 passbands can be independently controlled. A 6‐pole dual‐band filter with the passbands of 3300∼3600 MHz and 4800∼5000 MHz is successfully designed using the proposed method and fabricated with YBCO/MgO high‐temperature superconducting (HTS) wafer. The measured results of the filter exhibit high performance and match well with the simulations. The measured insertion losses are less than 0.2/0.3 dB, and the return losses are greater than 15/14 dB for the lower/upper passbands, respectively. The out‐of‐band rejection is greater than 68 dB up to 12 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-order dual-band superconducting filter with independently controllable passbands and wide stopband

Guo

Luo

et al. 2018

Int J RF Microw Comput Aided Eng

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“…Recently, a novel type of compact waveguide resonator has been proposed, which has been developed stemming from the concept of folding standing waves of a conventional TE10o mode waveguide resonator, and hence is referred to as folded waveguide (FW) resonator [7]. This has led to further developments of new compact filters [8]- [12], which are also attractive for implementation with multilayer device technology based on low temperature co-fired ceramic (LTCC) or liquid crystal polymer (LCP). Fig.…”

Section: Dual-mode Open-loop Resonator Filtersmentioning

confidence: 99%

Recent Progress in Miniature Microwave Filters

Hong

2008

2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components

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This paper aims to review some miniature microwave filters developed recently, including dual-mode microstrip openloop resonator filters, folded waveguide resonator filters, multilayer filters and superconducting filters. The concepts and techniques explored to achieve the miniaturization are described with some demonstrators.This very interesting and unique property can be exploited for further development of higher order quasi elliptic-function filters without using any cross coupling. For example, a fourpole filter can be designed to produce two finite-frequency transmission zeros using the coupling structure of Fig. 3. I. DUAL-MODE OPEN-LOOP RESONATOR FILTERSDual-mode microstrip resonators are attractive because each of dual-mode resonators can be used as a doubly tuned resonant circuit, and therefore the number of resonators required for a given degree of filter is reduced by half, resulting in a compact filter configuration [1]. Recently, a dual-mode microstrip triangular patch has been investigated [2], showing at the first time that the two degenerate modes, which are referred to as the even-and odd-modes, do not couple even after the perturbation introduced. This leads to the development of a new class of miniature filters including those using dual-mode triangle loop resonators [3]-[4] or dual-mode open-loop resonators [5].In particular, the new dual-mode open-loop resonator is developed from a single-mode (operated) open-loop resonator [6]. The open-loop resonator is well known for its flexibility to design cross-coupled resonator filters as well as its compact size, which amounts to A/8 by 2/8, where i is the guided wavelength at the fundamental resonant frequency. It has been shown that the dual-mode open-loop resonator has a size that is the same as the single-mode open-loop resonator, which, however, is much smaller than the conventional dual-mode loop resonator. The size of dual-mode open-loop resonator is only about one quarter of that of dual-mode square loop resonator, which is a significant size reduction. Fig. 1 demonstrates two dual-mode open-loop resonator filters, which have a coupling structure of Fig. 2. The two filters exhibit very distinct frequency responses. The one has a finitefrequency zero on the low side of the passband, and the other has a finite-frequency zero on the high side of the passband. It can be shown that the transmission zero is closely associated with the even mode. The transmission zero is allocated on the low side of the passband when the even-mode frequency is lower than the odd-mode frequency. On the other hand, the transmission zero is on the high side of the passband when the even-mode frequency is higher than the odd-mode frequency.-10

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“…The methods of defect ground structure and multilayer technology are utilised widely for miniaturisation of the filter [1,2] and [3] also introduced the method of the defected stepped impedance resonator (DSIR) and the microstrip stepped impedance resonator (MSIR) to realise the dual-band filter. Multilayer technology also can be used for designing the dual-band filter [4]. The method of a dual resonator is applied to realise the dual-band filter [5].…”

mentioning

confidence: 99%

Applications of shunt open stubs in filter design

Wang

Zhang

2011

Electron. Lett.

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The asymmetric half-wavelength resonator filter with shunt open stubs is analysed. Compared with the filter without shunt open stubs, two applications of shunt open stubs are obtained. First, it can be used for miniaturisation of the filter; secondly, the second passband can be obtained by it. To verify the analysis above, filters with and without shunt open stubs have been fabricated. The centre frequency of the passband was shifted to 1.90 GHz from 2.45 GHz and the second passband was realised. Simulated and measured results agree well.

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Multilayer folded-waveguide dual-band filter

Cited by 10 publications

References 11 publications

High-order dual-band superconducting filter with independently controllable passbands and wide stopband

High-order dual-band superconducting filter with independently controllable passbands and wide stopband

Recent Progress in Miniature Microwave Filters

Applications of shunt open stubs in filter design

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