Design and development of a dual directional coupler with transformers for HF band applications

Vishnu, R.

doi:10.1109/csn.2016.7823998

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Port 3 and 4 are terminated with 50 Ω resistors and the signal peaks are detected by using a diode sampling circuit where the voltage is read with a voltmeter (Fluke 287), as shown in figure 2(b). More detailed descriptions into the workings of couplers can be found in RF design and engineering resources [16,17]. The constructed BDC was calibrated using an offthe-shelf RF power meter (Rohde & Schwarz, NAS-Z9).…”

Section: Methodsmentioning

confidence: 99%

Combined ns pulsed-RF excitation and impedance matching considerations for the production of moderate E/n atmospheric pressure discharges for gas conversion

Filice,

Coulombe

2024

Plasma Sources Sci. Technol.

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Sub-breakdown radiofrequency (RF) discharges enabled by a nanosecond (ns) pulse ignition source are studied at atmospheric pressure in a range of gas mixtures from completely inert (in Ar) to completely reactive (in CO2). An electrical characterisation of the continuous wave (CW) RF discharge (13.56MHz) is performed to determine plasma impedance and plasma power dissipation. Two different measurement methods to electrically characterize the system are described and compared. One method uses in-situ measurements of discharge parameters (voltage, current and the phase angle), and the other method performs ex-situ measurements of the load circuit using a vector network analyser. It was found that RF plasma power deposition depended on the applied RF power as well as the gas mixture composition. Using the in-situ voltage, current and phase angle measurements, plasma power deposition was calculated to be as much as 85% and 76% of the applied RF power for the pure Ar and pure CO2 cases, respectively. A preliminary qualitative assessment of the plasma composition was performed by optical emission spectroscopy, and CO2 conversion by mass spectrometry. CO2 to CO conversions of 11.2% and 5.5% in a 20:80 (CO2:Ar) mixture and in 100% CO2, respectively, were observed. This study demonstrates a RF plasma source for gas conversion applications at atmospheric pressure in a completely reactive gas.

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Section: Methodsmentioning

confidence: 99%

Combined ns pulsed-RF excitation and impedance matching considerations for the production of moderate E/n atmospheric pressure discharges for gas conversion

Filice,

Coulombe

2024

Plasma Sources Sci. Technol.

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A compact directional coupler with high directivity using ferrite cores

Liu

2023

Electronics Letters

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In this paper, a wideband directional coupler is proposed for high‐power applications, which is composed of a transformer and lumped elements. The introduction of the transformer greatly improves the directivity of the coupler. The measurement results demonstrate that the proposed design has an excellent return loss (>17 dB), small insertion loss (<0.4 dB), and high directivity (>22) over a wide frequency band (10–350 MHz). Meanwhile, it can achieve a flat coupling level of 32 dB with the imbalance less than 0.5 dB.

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Design and development of a dual directional coupler with transformers for HF band applications

Cited by 2 publications

References 2 publications

Combined ns pulsed-RF excitation and impedance matching considerations for the production of moderate E/n atmospheric pressure discharges for gas conversion

Combined ns pulsed-RF excitation and impedance matching considerations for the production of moderate E/n atmospheric pressure discharges for gas conversion

A compact directional coupler with high directivity using ferrite cores

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