Modeling dispersion and radiation characteristics of conductor-backed CPW with finite ground width

In this paper, we characterize the substrate permittivity and overall loss of different planar transmission lines (TL) such as microstrip (MS), coplanar waveguide (CPW) and grounded CPW (GCPW) using on-wafer probes and a thru-reflect-line (TRL) calibration technique. The theory for calculation of the related effective permittivity from S-Parameter measurements is given and numerical simulations are being used for a fast and precise mapping of the effective permittivity εr,eff to the physical value εr of the TL's substrate. The method presented can be used for higher frequencies, as long as single mode operation of the TLs is ensured. Thus, an overview on higher order modes in TLs and design rules to suppress them is given. The results up to 67 GHz for the aforementioned TL on a conventional RF substrate are presented and used to evaluate approximate models known from publications.

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“…Besides the fundamental quasi-TEM mode, several types of higher order modes in planar TLs exist [7], [8], [9], [10], [11]:…”

Section: Higher Order Modes In Tlsmentioning

confidence: 99%

Analytical and experimental investigation of substrate permittivity and loss up to 67 GHz

Seiler

Klein

Plettemeier

2014

The 20th Asia-Pacific Conference on Communication (APCC2014)

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“…21 it turns out that a non-dispersive transmission line will have infinite threshold power, and the onset of modulation instability is forbidden. In real cases, dispersion is determined by the geometry of the structure [23]; it is dramatically dependent on the frequency and enhanced by anisotropic substrates and finite ground plane configurations. In transmission lines, the dispersion is due to the necessity to define an effective dielectric constant properly accounting for the CPW geometry.…”

Section: Circuit Modeling and Analytic Closed Form Approachmentioning

confidence: 99%

“…From such analysis, we can conclude that the effect has to be mainly considered starting from the millimeter wave range, where dispersion is more important [23]. By using pulse propagation, a quite general theory has been derived in [24] also for the microwave range.…”

Section: Circuit Modeling and Analytic Closed Form Approachmentioning

confidence: 99%

Modulation instability in RF MEMS devices

Marcelli

Bartolucci

Angelis

et al. 2012

Analog Integr Circ Sig Process

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Modulation instability generated by mechanical frequencies in RF MEMS switches is predicted and its potential contribution to the RF signal degradation is discussed. In particular, evaluations have been performed for double clamped configurations in shunt capacitive devices. As a conclusion, it is evidenced the possibility for the excitation of satellites affecting as noise sources higher than −40 dB the spectral purity of microwave sources

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“…But in practical cases, the conductor thickness can not be zero and affects the impedance, effective dielectric constant and losses etc. Several research papers have been presented to characterize planar transmission line structure with fin ite metallization thickness [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Loss Computation of Multilayer Coplanar Waveguide using Single Layer Reduction Method

Verma¹,

Singh²

2012

IJEA

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In this paper, the quasi-static spectral domain approach (SDA) and single layer reduction (SLR) method applicable for mult ilayer coplanar waveguide (CPW) on isotropic dielectric substrate that incorporates two layer model of conductor thickness is used to compute the impedance, effective d ielectric constant, dielectric loss and conductor loss. The transverse transmission line (TTL) technique is used to find the Green's function for the mult ilayer CPW in Fourier domain. Dielectric loss of mult ilayer coplanar waveguide is co mputed by converting multilayer CPW structure into equivalent single layer CPW using SLR method. Perturbation method is used to compute the conductor loss. The effect of finite conductor thickness is analysed on the impedance, effective dielectric constant, dielectric loss and conductor loss. The present formulation also accounts for low frequency dispersion in computation of quasi-static effective dielectric constant and characteristic impedance.

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Modeling dispersion and radiation characteristics of conductor-backed CPW with finite ground width

Cited by 71 publications

References 11 publications

Analytical and experimental investigation of substrate permittivity and loss up to 67 GHz

Analytical and experimental investigation of substrate permittivity and loss up to 67 GHz

Modulation instability in RF MEMS devices

Loss Computation of Multilayer Coplanar Waveguide using Single Layer Reduction Method

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