Open and short circuits in coplanar MMIC's

Beilenhoff, K.; Klingbeil, Harald; Heinrich, W.; Hartnagel, H.L.

doi:10.1109/22.245673

Cited by 57 publications

(19 citation statements)

References 8 publications

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“…This is accomplished by evaluating the openend capacitance of a CPW with center-conductor width W, slot width S, and end-gap width G. Then, this is multiplied by the number of fingers N, since we have N open ends. To obtain the CPW open-end capacitance, the expression derived in [28], based on the assumption of narrow slots, is used when G/(S ϩ 2W) Յ 0.2, while the simple formula for the effective length extension (ᐉ oc ) given in [27] is used otherwise. Finally, in the case of two fingers (N ϭ 2), a structure with two strips exists, which is essentially the coplanar-strips (CPS) line [1].…”

Section: A Capacitance C Smentioning

confidence: 99%

“…There seems to be something wrong in the presented expression for C end [26]. Thus, the model presented in [2] is used to compute C end , which relies on the simple expressions given in [27,28]. This is accomplished by evaluating the openend capacitance of a CPW with center-conductor width W, slot width S, and end-gap width G. Then, this is multiplied by the number of fingers N, since we have N open ends.…”

Section: A Capacitance C Smentioning

confidence: 99%

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CAD modeling of coplanar waveguide interdigital capacitor

Dib

Ababneh

Omar

2005

Int J RF and Microwave Comp Aid Eng

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Section: A Capacitance C Smentioning

confidence: 99%

Section: A Capacitance C Smentioning

confidence: 99%

CAD modeling of coplanar waveguide interdigital capacitor

Dib

Ababneh

Omar

2005

Int J RF and Microwave Comp Aid Eng

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“…where b is the phase constant, l oc is a function of the strip conductor width W, slot width S, and the open end gap width g 1 (Beilenhoff et al 1992;Beilenhoff et al 1993). These studies showed that when the dimensions of the CPW are very small compared to the wavelength, the dispersion is negligible and independent of the frequency.…”

Section: Capacitance Effect Of the Electrode-solution Contact Areamentioning

confidence: 94%

Design and fabrication of microfluidic devices integrated with an open‐ended MEMS probe for single‐cell impedance measurement

Jang

Jao

et al. 2009

Microfluid Nanofluid

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When an electrical current with a low frequency is applied to a cell, the current passes through the outside of the cell. Thus, impedance measurements at low frequencies cannot be used to determine the pathological change of the cellular organelle taking place inside the cell. However, increasing the frequency of the electrical current makes the capacitive impedance of the cell decrease, allowing the electrical current to flow through the cell. This study presents the design and fabrication of a microfluidic device integrated with a coplanar waveguide open-ended micro-electro-mechanical-systems (MEMS) probe for the impedance measurement of the single HeLa cell in frequencies between 1 MHz and 1 GHz. The device includes a poly-dimethlysiloxane (PDMS) cover with a microchannel and microstructures to capture the single HeLa cell and a conductor-backed CPW fabricated using a silicon chip and two printed circuit boards (PCB). The effects of the substrate on the characteristic impedance of the conductor-backed coplanar waveguide (CBCPW) structure were investigated under three conditions by utilizing a time-domain reflectometer (TDR). Finally, impedance measurements using the proposed device and a vector network analyzer (VNA) are demonstrated for de-ionized (DI) water, alcohol, PBS, and a single HeLa cell.

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“…Moreover, for a constant number of fingers, the inductance value increases as the finger width or gap-width decreases. Finally, according to (19) and (21), the resonant frequency of the UIC can be written as…”

Section: Analytical Formula For L Uicmentioning

confidence: 99%

Ungrounded composite right-/left-handed metamaterials: design, synthesis and applications

Booket

Veysi

Atlasbaf

et al. 2012

IET Microw. Antennas Propag.

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The design of ungrounded meander line inductors (UMIs) and ungrounded interdigital capacitors (UICs) employed in the practical realisation of a planar ungrounded composite right-/left-handed (UCRLH) metamaterial is presented. Accurate lumped-element circuit models are proposed based on partial element theory and conformal mapping method. New and accurate analytical design formulas, for both the UMI and the UIC at very high frequency and ultra high frequency bands are derived and successfully validated through a proper comparison with the existing measurement data and the results obtained with the full wave method of moments. Further insight is sought through the investigation of the resonance mechanism of a printed dipole antenna loaded with UCRLH metamaterial cells. A prototype of the loaded dipole is fabricated to confirm and validate the theoretical calculations. The experimental results are found to be in good agreement with the theoretical calculations.

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Open and short circuits in coplanar MMIC's

Cited by 57 publications

References 8 publications

CAD modeling of coplanar waveguide interdigital capacitor

CAD modeling of coplanar waveguide interdigital capacitor

Design and fabrication of microfluidic devices integrated with an open‐ended MEMS probe for single‐cell impedance measurement

Ungrounded composite right-/left-handed metamaterials: design, synthesis and applications

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