Optimization of Coaxial Couplers

Ghosh, Tushar K.; Carter, Richard G.; Challis, A.J.; Rushbrook, Kevin; Bowler, D.

doi:10.1109/ted.2007.898045

Cited by 21 publications

(5 citation statements)

References 8 publications

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“…Both the input and output couplers exhibited a return loss better than −20 dB across the operating band of 10.9−11.7 GHz. Another study optimized a coaxial coupler as the output for a helix TWTA, 14 achieving an optimized Voltage Standing-Wave Ratio (VSWR) better than 1.5 within the frequency range of 6−18 GHz. In these investigations, the input and output coaxial couplers included components such as windows, impedance transformers, and a transition to a subminiature version A (SMA) connector.…”

Section: ■ Introductionmentioning

confidence: 99%

Integrated Couplers of THz Radiation for Helical Slow-Wave Structures

Hajitabarmarznaki,

Scott,

Martinez-Argudo

et al. 2024

ACS Omega

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We have designed an integrated device that couples input and output coaxial horn antennas with a self-assembled helical slow-wave structure cradled in a v-groove on a silicon-on-insulator wafer. These devices will potentially enable the characterization of cold parameters and beam-wave interaction in slow-wave structures on a wafer level, i.e., without having to dice and package individual devices. In addition, such vertically integrated antennas and helical slow-wave structures may form the basis of compact and low-cost traveling-wave tube amplifiers operating at THz frequencies.

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Section: ■ Introductionmentioning

confidence: 99%

Integrated Couplers of THz Radiation for Helical Slow-Wave Structures

Hajitabarmarznaki,

Scott,

Martinez-Argudo

et al. 2024

ACS Omega

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“…Coaxial couplers are used in traveling-wave tubes (TWTs) to feed and extract RF power into and from interaction structure/slow wave structure (SWS) respectively [1][2][3][4][5]. However, output coupler has to handle medium to high average power, hence, there must be minimum reflection of RF power so that heat load may also be minimized.…”

Section: Introductionmentioning

confidence: 99%

Transmission Line Theory and Thermal Analysis of Coaxial Coupler for TWTS

Roy¹,

Gahlaut²,

Jain³

et al. 2015

PIER Letters

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Abstract-This paper presents the transmission line analysis, thermal and structural analysis of a multi-section coaxial coupler (MSCC) used in traveling-wave tubes (TWTs) to handle high average power over a wide frequency range. Power transmission through coupler from the device demands very good matching between load and source impedances such that low voltage standing wave ratio (VSWR) is achieved. Modeling of the MSCC for wideband TWTs in commercially software packages takes very long iteration time even in high-end computers. An analytical approach has been developed to model MSCC which takes less iteration time even in ordinary computer. Analytical results have been compared to those obtained from CST microwave studio. Finally, thermal and structural analysis has been carried out to study the thermal aspects for handling high average RF power.

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“…This is called the slowwave phenomenon. The slow-wave theory in the microwave range has been investigated with most grounded slow-wave structures [22]- [31]. In this paper, a slow-wave CPW transmission line, combining the advantages of both CPW transmission lines and MS lines, is proposed to create high-performance passive components for MMIC chips.…”

Section: Introductionmentioning

confidence: 99%

High-Performance Slow-Wave Transmission Lines With Optimized Slot-Type Floating Shields

Cho

Yeh

Liu

et al. 2009

IEEE Trans. Electron Devices

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A novel slow-wave transmission line with optimized slot-type floating shields in advanced CMOS technology is presented. Periodical slot-type floating shields are inserted beneath the transmission line to provide substrate shielding and to shorten the electromagnetic (EM) propagation wavelength. This is the first study that demonstrates how the wavelength, attenuation loss, and characteristic impedance can be adjusted by changing the strip length (SL), strip spacing (SS), and metal layer position of the slottype floating shields. Wavelength shortening needs to be achieved with a tradeoff between slow-wave effect and attenuation loss. The slot-type floating shields with different SLs, SSs and metal layer positions are analyzed. It is concluded that minimum SL provides the most optimal result. A design guideline can be established to enable circuit designers to reach the most appropriate slot-type floating shields for optimal circuit performance. Transmission line test structures were fabricated by using 45-nm CMOS process technology. Both measurement and EM waves simulation were performed up to 50 GHz. Transmission lines are frequently used at a length of half-or quarter-wavelength. With a shortened wavelength, a saving in silicon area of more than 67% can be achieved by using optimized slot-type floating shields. Experimental results demonstrated a higher effective relative permittivity value, which is improved by a factor of more than 9, and a better quality factor, which is improved by a factor of more than 6, as compared to conventional transmission lines.

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Optimization of Coaxial Couplers

Cited by 21 publications

References 8 publications

Integrated Couplers of THz Radiation for Helical Slow-Wave Structures

Integrated Couplers of THz Radiation for Helical Slow-Wave Structures

Transmission Line Theory and Thermal Analysis of Coaxial Coupler for TWTS

High-Performance Slow-Wave Transmission Lines With Optimized Slot-Type Floating Shields

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