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

Heinrich, W.; Schnieder, Frank; Tischler, T.

doi:10.1109/mwsym.2000.862297

Cited by 21 publications

(22 citation statements)

References 5 publications

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“…The microstrip line has width W m = 0.773 mm. To determine the reliable frequency band B, a characterization of the CPW higher-order modes is performed by following the approach outlined in [16], where the resonance effects in both the substrate thickness and the lateral directions are modelled in terms of an effective permittivity mn eff for each higher-order mode HM mn . In Table 1, the intersection frequency between the eff curves of the fundamental mode and the generic higher-order mode HM mn is reported for the first three propagating modes in the conductor-backed CPW.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Due to the assumption of fundamental mode propagation, the reliable band B of the approach adopted in the paper is upper limited by the intersection frequency between the fundamental mode and the first higher-order mode [15,16]. However, this upper bound does not give strong limitations, as a proper selection of CPW dimensions can inhibit higher-order modes, so providing a very wideband behavior.…”

Section: Theorymentioning

confidence: 99%

“…Based on the approach outlined in [11,12], the fundamental mode propagation is assumed, and each section of the conductor-backed CPW-to-microstrip transition is properly dimensioned to prevent the excitation of higher-order modes [15,16] within the operating frequency band. A gradual smooth transformation is realized from the CPW mode to the microstrip mode, while keeping the characteristic impedance constant along the transition [12], so reflections due to impedance changes are avoided and the assumption of single-mode operation gives accurate results.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Multi-Step Coplanar Waveguide-to-Microstrip Transition

Costanzo¹

2011

PIER

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Abstract-A synthesis procedure is developed in this paper for the design of N-step coplanar waveguide-to-microstrip transitions. An equivalent circuit approach is adopted to model the structure in terms of N cascaded ABCD matrices relative to the N coplanar waveguide sections forming the transition. A constrained optimization problem is formulated as the minimum finding of a proper functional to accurately determine the transition dimensions by imposing an upper bound to the return loss within a prescribed frequency band. An iterative Nstep procedure is developed to find the optimization problem solution. Numerical results on millimeter-wave transition configurations are provided to demonstrate the effectiveness of the proposed synthesis method. A back-to-back transition prototype with N = 3 sections is then fabricated and characterized in terms of measured S-parameters to experimentally demonstrate a return loss better than 10 dB in the frequency range from 1 GHz up to 40 GHz.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Multi-Step Coplanar Waveguide-to-Microstrip Transition

Costanzo¹

2011

PIER

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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%

“…They propagate in-between the structure given by the top and ground metallization, which can be seen as a parallel plate TL, hence they are often referred to as parallel plate (PPL) modes [10]. For MS, these modes are -besides the other, parasitic modes -the true higher order modes of the fundamental MS mode.…”

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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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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Characterization of coplanar strip lines on dielectric boards for RF and microwave applications

Song

Lee

2007

Int J RF and Microwave Comp Aid Eng

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We report the characterization of coplanar strip (CPS) transmission lines on dielectric boards at millimeter-wave frequency up to 40 GHz. The CPS line was analyzed and simulated using computer-aided design tools. Many CPS lines were built on RT/Duroid board and the measured attenuation is as low as 0.8 dB/cm at 30 GHz. CPS lines of various electrode width and width-to-gap ratios were measured to obtain key design guidelines. The CPS line has both the signal and ground electrodes on the front surface of the board. In contrast to the microstrip line, the CSP line does not include the backside of the board as a part of the transmission line. Thus, the backside can be left open as dielectric or metallized. The backside condition can affect the wave propagation if it is too close to the electrodes. We simulated and measured the attenuation coefficient, line impedance, and electrical field distributions for different backside conditions. Our results clearly indicate that the CPS line is an attractive transmission line on the board level in millimeter electromagnetic waves applications. Its applications can be extended to microwave and millimeter-wave integrated circuits. V V C 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE 18: 76-85, 2008.

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

Cited by 21 publications

References 5 publications

Synthesis of Multi-Step Coplanar Waveguide-to-Microstrip Transition

Synthesis of Multi-Step Coplanar Waveguide-to-Microstrip Transition

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

Characterization of coplanar strip lines on dielectric boards for RF and microwave applications

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