Characteristics of periodically loaded CPW structures

Görür, Adnan; Karpuz, Ceyhun; Alkan, Mustafa

doi:10.1109/75.704413

Cited by 83 publications

(19 citation statements)

References 5 publications

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“…In the functionality of a typical planar resonator, the most decisive factors are coupling gaps [16,17], center conductor width [18,19], film quality and edge sharpness [20,21], ground plane size and packaging effects [22], effective permittivity (ε eff ) [4] and meander line dispersion [23,24]. Coplanar resonators can be designed based on these theoretical considerations, but resonator optimization for new applications often involves additional testing and tuning of design parameters of the actually fabricated devices, such as presented in this work.…”

Section: Methodsmentioning

confidence: 99%

Metallic coplanar resonators optimized for low-temperature measurements

Rahim¹,

Lehleiter²,

Bothner³

et al. 2016

J. Phys. D: Appl. Phys.

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Metallic coplanar microwave resonators are widely employed at room temperature, but their low-temperature performance has received little attention so far. We characterize compact copper coplanar resonators with multiple modes from 2.5 to 20 GHz at temperatures as low as 5 K. We investigate the influence of center conductor width (20 to 100 µm) and coupling gap size (10 to 50 µm), and we observe a strong increase of quality factor (Q) for wider center conductors, reaching values up to 470. The magnetic-field dependence of the resonators is weak, with a maximum change in Q of 3.5% for an applied field of 7 T. This makes these metallic resonators well suitable for magnetic resonance studies, as we document with electron spin resonance (ESR) measurements at multiple resonance frequencies.

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Section: Methodsmentioning

confidence: 99%

Metallic coplanar resonators optimized for low-temperature measurements

Rahim¹,

Lehleiter²,

Bothner³

et al. 2016

J. Phys. D: Appl. Phys.

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“…A new simple formula using the number of slits is introduced to calculate the resonance frequency of microstrip SLRs loaded inductively by narrow slits. As is well known, the total electrical length increases also while the number of slits located on a transmission line used as a λ/2 resonator increases and therefore, the resonance frequency decreases [5]. On the basis of this principle, a novel microstrip dual‐mode resonator having slow‐wave characteristic is proposed to reduce the size of conventional microstrip dual‐mode filters.…”

Section: Introductionmentioning

confidence: 99%

Effects of narrow slits on frequency response of a microstrip square loop resonator and dual‐mode filter applications

Karpuz

Görür

2012

Micro & Optical Tech Letters

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In this letter, the effect of narrow slits on resonance characteristics for a microstrip square loop resonator (SLR) with mitered bends is investigated and a new formula to calculate the resonance frequency of SLRs loaded inductively by means of slits is derived as a function of the number of slits.A novel dual‐mode SLR configuration performing a slow‐wave characteristic obtained by using narrow slits is proposed to use in design of microstrip dual‐mode bandpass filters. Also, a new perturbation technique based on the change of electrical lengths is presented for the excitation of two degenerated modes of these type resonators. Additional, two dual‐mode bandpass filters having linear phase and elliptical frequency characteristics have been designed, fabricated and tested to verify the proposed filter topology. Experimental results agree with simulated results. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:143–146, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27237

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“…Interdigital capacitors are widely used as passive elements in many microwave integrated circuits. So far, a number of coplanar waveguide (CPW) resonators loaded periodically have been studied to reduce the size and weight of microwave structures [1][2][3]. The size of filters can greatly be reduced by using such coplanar slow-wave resonators.…”

Section: Introductionmentioning

confidence: 99%

Parameter extraction of interdigital slow-wave coplanar waveguide circuits using finite difference frequency domain algorithm

et al. 2008

Int J RF and Microwave Comp Aid Eng

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The slow wave effect can be obtained by a capacitively loaded structure with a symmetrical interdigital line connected on both sides of the coplanar waveguide (CPW) central line. The ferroelectric thin film with high dielectric constant can reduce the size of circuit and make it possible to realize tunable devices such as filter by applying voltage on it. Actually, this kind of slow wave structure is a periodic guided-wave structure and can be analyzed by using classic finite difference frequency domain (FDFD) method for periodic guided-wave structures. However, the very compact slow-wave structures will usually result in simulation errors when the classic FDFD method is adopted, which will lead to a nonsymmetrical generalized eigenvalue problem. In this article, the shift-and-invert (SI) Arnoldi method is used to directly resolve this nonsymmetrical generalized eigenvalue problem. As a result, the accuracy of FDFD algorithm is improved. Especially for the large scale eigenvalue problem, SI method can also have a very fast speed of calculation. By means of its complex propagation constant obtained from simulation, one can extract circuit parameters of the interdigital capacitor. Consequently, one can analyze and design relevant resonators and filters in a quick and accurate manner, which are constructed with such interdigital slow wave structures.

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Characteristics of periodically loaded CPW structures

Cited by 83 publications

References 5 publications

Metallic coplanar resonators optimized for low-temperature measurements

Metallic coplanar resonators optimized for low-temperature measurements

Effects of narrow slits on frequency response of a microstrip square loop resonator and dual‐mode filter applications

Parameter extraction of interdigital slow-wave coplanar waveguide circuits using finite difference frequency domain algorithm

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