CAD modeling of coplanar waveguide interdigital capacitor

Dib, Nihad; Ababneh, Jehad; Omar, A.A.

doi:10.1002/mmce.20099

Cited by 21 publications

(20 citation statements)

References 25 publications

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“…found. Assuming the total capacitance to be proportional to the number of fingers n (this is approximately true when n < 20, as showed in papers where more sophisticated CAD modeling were presented [18,19]), the estimated capacitance is consistent with the experimental value within the same order of magnitude.…”

Section: De-embedding Analysissupporting

confidence: 62%

Buried Tantalate-Niobate Microwave Varactors

Bonetti

Kim

Khartsev

et al. 2006

2006 15th Ieee International Symposium on the Applications of Ferroelectrics

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We present characteristics of microwave variable capacitors (varactors) buried in 2.5 pim thick AgTao.5NbO.503 (ATN) film pulsed laser deposited on sapphire single crystal. 2 ptm gap interdigital capacitors (IDC) were fabricated by photolithographic, dry etching and lift-off processes. For comparison, similar IDCs were also defined on top of ATN film. Capacitance and loss tangent have been deternined using a modified deembedding technique in the microwave range 25 MHz -40 GHz. Buried structures show higher values of capacitance and tunability, keeping the same level of losses compared to standard topped devices and resulting in an increased K-factor = tunability/tan A Experimental results are explained within equivalent circuit model. Besides the increased perfornance, the new design avoids the need of a successive planarization step, which could be required in an integration process.

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Section: De-embedding Analysissupporting

confidence: 62%

Buried Tantalate-Niobate Microwave Varactors

Bonetti

Kim

Khartsev

et al. 2006

2006 15th Ieee International Symposium on the Applications of Ferroelectrics

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“…The effective finger width modification is also included in his model, although only one case where the substrate is much thicker than the finger width is considered. Later Dib et al [12] modified Gevorgian model by proposing another computational model of the finger endings' capacitance in 2005. However, his model gives much larger deviation from our experimental data than Gevorgian's.…”

Section: B Modified Analytical Modelsmentioning

confidence: 99%

Development and experimental verification of analytical models for printable interdigital capacitor sensors on paperboard

et al. 2009

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Printed interdigital capacitor (IDC) on paperboard is a promising solution for low-cost sensors in intelligent packaging applications. The currently available analytical models of multi-layered IDCs are targeted to those fabricated by conventional semiconductor process. For this reason, we have adapted two promising models and assessed their accuracies by comparison with experimental data. We modified these models by treating the paper as non-infinite thick substrate and taking the effect of printed metal thickness into account. The models are studied further to reveal the relationship between the response of capacitance change and various geometric parameters which enables a quick way of obtaining the optimum IDC structure design. The modified Gevorgian model fits our experimental data best, and the sensitivity of IDCs is largely affected by its spatial wavelength and the thickness of sensing material layer, while the finger number, length and metallization ratio have minor impact.

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“…The IDC is a passive element that uses the coupling effect between finger conductors, creating a high capacitance that improves the impedance matching of the antenna. The analysis into the physical insight of the IDC has been extensively investigated using its equivalent circuit model . The proposed antenna with the IDC structure comprises 18 fingers, with the width and length of each finger being ( c 4 × c 1 ) = 2 × 13.5 mm 2 and the length of the IDC being ( c 2 ) = 70 mm (see Figure C).…”

Section: Antenna Designmentioning

confidence: 99%

Bandwidth and directivity enhancement of an internal folded monopole antenna loaded by interdigital capacitor for ultra‐high‐definition television applications

Trinh

Jung

2019

Micro & Optical Tech Letters

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An internal antenna with bandwidth and directivity enhancement was developed for operation in ultra‐high‐frequency bands (UHF: 470‐771 MHz, bandwidth: 48.5%) for ultra‐high‐definition television (UHD‐TV) applications. The antenna is integrated into a 49‐in. TV model, which is surrounded by a bezel frame made of polycarbonate‐acrylonitrile butadiene styrene (PC‐ABS) plastic. This material was also used as a substrate in fabricating the antenna. The antenna has a compact size of 0.387λL × 0.023λL × 0.0093λL (where λL is the wavelength at the lowest operating frequency) and is fed by a 50 Ω coplanar waveguide (CPW) feedline. To achieve wideband operation and directional radiation, the proposed internal antenna was designed on the basis of a folded monopole antenna loaded with parasitic strips and an interdigital capacitor. The experimental results showed that the antenna exhibits a wide impedance bandwidth of 86% (400‐1000 MHz) under the criterion |S11| ≤ −6 dB (Voltage Standing Wave Ratio (VSWR) ≤ 3), a directional radiation pattern with a maximum realized gain of 5.2 dBi, and a radiation efficiency of more than 68%. These findings indicate that the antenna is suitable for UHD‐TV applications.

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CAD modeling of coplanar waveguide interdigital capacitor

Cited by 21 publications

References 25 publications

Buried Tantalate-Niobate Microwave Varactors

Buried Tantalate-Niobate Microwave Varactors

Development and experimental verification of analytical models for printable interdigital capacitor sensors on paperboard

Bandwidth and directivity enhancement of an internal folded monopole antenna loaded by interdigital capacitor for ultra‐high‐definition television applications

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