Design of dual-mode ring resonators with transmission zeros

Cheng, Kwok‐Keung M.

doi:10.1049/el:19970947

Cited by 50 publications

(25 citation statements)

References 2 publications

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“…The location of transmission zeros are calculated for the proposed dual-mode star shaped resonator theoretically by using even and odd mode analysis as described in [18]. The equivalent circuit of a dual-mode filter shown in Fig.…”

Section: Even and Odd Mode Analysismentioning

confidence: 99%

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Compact Dual-Mode Microstrip Bandpass Filters With Transmission Zeros Using Modified Star Shaped Resonator

Rao¹

2017

PIER C

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Abstract-A modified star-shaped dual-mode microstrip loop resonator with a triangular patch is proposed to design compact narrow band bandpass filters with transmission zeros. The triangular patch is used as perturbation element to couple degenerated modes. The position of transmission zeros can be tuned by varying the size and location of the perturbation element. The coupling mechanism (inductive or capacitive) and the type of input/output feed (orthogonal or non-orthogonal) determine the type of filter response like symmetric or asymmetric. Three highly selective two-pole narrow band bandpass filters are designed using a modified star-shaped resonator with tunable transmission zeros. First, two filters with non-orthogonal feed lines have an asymmetric response with transmission zeros on one side of the passband, whereas the third filter with orthogonal feed lines exhibits symmetric frequency response with transmission zeros on both sides of the passband. Even and odd mode analysis is applied to the dual-mode filters to calculate the position of transmission zeros. Filters are realized using a low loss dielectric substrate, and measured results are in good agreement with the theoretical and simulated ones.

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Section: Even and Odd Mode Analysismentioning

confidence: 99%

“…The selection of orthogonal [11][12][13][14] and non-orthogonal [15][16][17][18] feed lines used in the design of filters influences the frequency response. A small triangular patch is used as a perturbation element to couple degenerated modes.…”

Section: Introductionmentioning

confidence: 99%

Compact Dual-Mode Microstrip Bandpass Filters With Transmission Zeros Using Modified Star Shaped Resonator

Rao¹

2017

PIER C

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“…Because all elements of the circuit operated at millimeterwave should be taken into consideration for precisely determining the characteristics of the circuit, a new set of dual-mode synthesizing equations, which includes the terms neglected in the conventional method [8], is also proposed in this paper for calculating the values of the elements of the filter. By bring the element values obtained from the new synthesizing equations into the proposed circuit model; the practical layout of the multi-band MMIC filter can be determined quickly.…”

Section: Introductionmentioning

confidence: 99%

“…Then the conventional even-and odd-mode analysis methods can be applied to determine the values of other elements, which are the capacitances of C fn and C pn of the dual-band filter in their own band. Usually, chip filters are operated in millimeterwave frequency bands, so the typical dual-mode filter synthesis equations, which assumes 2 C f Z T f c and C P Z T f c to be much smaller than unity [8], may be not applicable. …”

Section: Introductionmentioning

confidence: 99%

Design of a MMIC tri-band filter for 60-/77-/100-GHz applications

Yang

Chiang

Chiu

et al. 2011

2011 IEEE MTT-S International Microwave Symposium

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A tri-band dual-mode chip filter, which is fabricated in a commercial pHEMT GaAs technology and suitable for millimeter-wave applications, is presented in this paper. This filter is constructed by using stacked ring resonators with individual perturbations and feeding capacitors; thus, fractional bandwidths and center frequencies of three pass bands can be flexibly controlled. A model of the tri-band filter that considers coupling effects between stacked ring resonators is first proposed, and then a synthesis method that can determine values of all elements of a typical dual-mode ring filter based on specifications of required characteristics is also described. According to the proposed design method, filter designers can quickly determine the layout pattern of the tri-band dual-mode filter which employs proper metal-insulatormetal (MIM) capacitors to obtain the desired filter performance. To verify the proposed design concept, an experimental prototype, locating three pass bands at 60 GHz, 77 GHz and 100 GHz, respectively, was fabricated on GaAs substrate. The size of the filter is about 0.46×0.91 mm 2 and the measured insertion losses in the three passbands are less than 2.4 dB, 2.7 dB and 3.5 dB. The associated return losses are greater 18 dB, 17 dB and 8 dB over the frequency bands of interest.Index Terms -Tri-band filter, dual-mode filter, MMIC, chip filter.

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“…1 shows a proposed dual-mode filter utilised typically in a dual-mode ring resonator filter. The dual-mode filter of this type exhibits a quasi-elliptic function response with a finite-frequency attenuation pole on each side of the passband [7][8][9]. The transmission line section with the tunable characteristic impedance due to the BST varactor, which may be termed as a perturbation block, is used to perturb the originally orthogonal EM fields.…”

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confidence: 99%

Tunable dual-mode filter using varactor and variable ring resonator on integrated BST/TiO2/Si substrate

Kim

2010

Electron. Lett.

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A RF tunable dual-mode filter employing a BST (Ba x Sr 12x TiO 3 )-based ring resonator and a capacitor is proposed. BST thin film was deposited on TiO 2 /Si substrate and a TiO 2 buffer layer grown by ALD (atomic layer deposition). The device with a BST varactor capacitance of 0.5 pF and 40% of tunability applied voltage of 40 V, and a tunable ring resonator frequency of 1.53 -2.02 GHz with a bias of up to 40 V, has been realised. The fabricated bandpass filter has a centre frequency of 1.53 GHz and shows a tunability of approximately 20% with an applied voltage of 40 V. It also has a bandwidth of 74 MHz and shows a tunability of approximately 27% with an applied voltage of 40 V.Introduction: Tunable dielectric-based RF device technology is one of the suitable solutions for intelligent RF applications satisfying multiband or multimode standards. Specifically, barium strontium titanate, Ba x Sr 12x TiO 3 (BST), is being investigated with considerable interest as a dielectric material for tunable microwave device applications owing to its large field dependent permittivity, high dielectric constant, and relatively low loss tangent. By using these advantageous properties of BST, a number of advanced tunable capacitors have been successfully demonstrated and integrated into RF components, such as phase shifters and RF filters [1][2][3][4][5][6].In this Letter, we present a tunable dual-mode bandpass filter using ferroelectric varactor and ring resonator perturbation. We obtained high tunability and improved microwave properties of BST films on Si by an atomic layer deposition (ALD)-grown TiO 2 buffer layer [2-4] and compared BST films on MgO single crystal substrate by PLD (pulsed laser deposition). Through the simulation and measurement results, it is shown that RF tunable bandpass filters can be applicable to the dual-mode ring resonator with BST varactor design.

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Design of dual-mode ring resonators with transmission zeros

Cited by 50 publications

References 2 publications

Compact Dual-Mode Microstrip Bandpass Filters With Transmission Zeros Using Modified Star Shaped Resonator

Compact Dual-Mode Microstrip Bandpass Filters With Transmission Zeros Using Modified Star Shaped Resonator

Design of a MMIC tri-band filter for 60-/77-/100-GHz applications

Tunable dual-mode filter using varactor and variable ring resonator on integrated BST/TiO2/Si substrate

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