A THZ cross-guide waveguide directional coupler with high directivity

Wang, Xin; Zhao, Peng; Yang, Tingting

doi:10.1109/icept.2014.6922892

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…Until recently, the mainstream research into directional couplers applied for the power monitoring of VEDs has mainly been focused on traditional aperture-type directional couplers [12][13][14][15][16][17][18][19][20][21][22], which are conventionally composed of a high-order mode circular waveguide (main waveguide) and a standard or non-standard rectangular waveguide (secondary waveguide), connected in a parallel or orthogonal way through two or more coupling apertures with various shapes. For structures where the primary and secondary waveguides are connected in a parallel arrangement, it is necessary to adjust the size, spacing, and number of the coupling holes to obtain excellent performance.…”

Section: Introductionmentioning

confidence: 99%

“…For structures where the primary and secondary waveguides are connected in a parallel arrangement, it is necessary to adjust the size, spacing, and number of the coupling holes to obtain excellent performance. However, since these variables are designed in the axial direction (the direction in which the electromagnetic wave propagates) of the coupler, it inevitably leads to a doubling of the axial length, which is usually more than ten times the wavelength [12][13][14][15][16][17][18], which makes the experimental operation inconvenient and reduces the compactness of the overall system. Another traditional structure is to connect the main and secondary waveguides of the coupler in an orthogonal way, which has the advantage of greatly reducing the axial length of the device.…”

Section: Introductionmentioning

confidence: 99%

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A Compact Circular Waveguide Directional Coupler for High-Order Mode Vacuum Electronic Devices

Zhu,

Fu,

et al. 2024

Electronics

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In this paper, a compact circular waveguide directional coupler for high-order mode vacuum electronic devices is presented and investigated. To reduce the size, the primary and secondary waveguides of this coupler are connected in an orthogonal way by two coupling holes. Moreover, to improve the directivity and operating bandwidth, a method of loading adjustable metal stubs on the isolating port is proposed and introduced in design. A Ka-band TE01-mode circular waveguide directional coupler was designed, and the structure parameters were optimized by electromagnetic simulation. To verify the design, a prototype sample was fabricated, assembled, and tested. The experimental results show good agreement with the simulations, and the directivity are improved by adjusting the metal stubs on the isolating port. In the experiment, a 26.7 dB directivity at 35 GHz was obtained, and the bandwidth of directivity above 20 dB was higher than 7 GHz, corresponding to a relative bandwidth higher than 20%. Meanwhile, the TE01° mode maintained good transmission efficiency in this compact high-order mode directional coupler.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Compact Circular Waveguide Directional Coupler for High-Order Mode Vacuum Electronic Devices

Zhu,

Fu,

et al. 2024

Electronics

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Design of X‐band Moreno cross‐guide coupler based on superformula curves

Tayebi

Zarifi

Nasri

2019

Int J RF Microw Comput Aided Eng

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This article deals with the design of Moreno cross-guide couplers based on supershapes for X-band applications. Crossed-waveguide couplers are mainly used due to their compact structures. In these couplers, cross-aperture structures are usually employed to offer flat coupling and high isolation. In the present article, the possible shapes for apertures and metal inserts that can be derived by the superfomula curves are explored and the effects of variations of superformula parameters are investigated on the performance of Moreno coupler. Finally, the proposed Moreno coupler is validated through fabrication and measurement. The experimental validation shows an excellent agreement with the simulated results. In the frequency range from 8 to 12.5 GHz, the measured coupling value changes from 18.8 to 20.8 dB and the directivity is better than 38 dB and 29 dB from 8 to 11 GHz and 11 to 12.5 GHz, respectively. The results are valuable for the design and evaluation of broadband high directive waveguide couplers. K E Y W O R D Scross-guide, directional coupler, superformula

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