Design of wide-band mode discriminator based on mode-selective coupling

Wang, Wenxiang; Yue, Lingna; Jiang, Pingying; Gong, Yubin

doi:10.1080/00207210701814119

Cited by 6 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After comprehensive consideration, we choose 1 mm as the hole depth. To yield wider working bandwidth, the design method of the equal-interval and unequal-intensity hole distribution is adopted, and Chebyshev distribution is used as the intensity distribution function [19]. Considering the requirements above and the size of the directional coupler synthetically, repeating the calculations with the model, the final calculated diameters of the 23 holes range from 0.54 mm to 0.66 mm, the smallest are at the two ends and increase towards the center gradually.…”

Section: Parameter Design Of the Directional Couplermentioning

confidence: 99%

“…Some previous papers have presented different designed directional couplers for the over-moded corrugated waveguides [11][12][13], and the theories for coupling schemes have been previously developed [14][15][16][17][18][19]. One of the commonalities is that the over-moded corrugated waveguides are assumed to ideally operate only in the LP 01 mode [6].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

Weng¹,

Xia²,

Tian³

et al. 2022

Plasma Sci. Technol.

View full text Add to dashboard Cite

Power measurement is necessary for an electron cyclotron resonance heating (ECRH) system. The directional coupler method has been put forward to monitor high-power microwave from gyrotrons in real time. A multi-hole directional coupler has been designed and manufactured for the 105 GHz/500 kW ECRH system on J-TEXT tokamak. During the design process, we established the relationships between hole parameters and coupling characteristics based on the multi-hole coupling method and small-hole coupling theory. High-power tests have been carried out. The results indicated the reasonability of the theoretical design and practicality of the fabricated directional coupler. Sources of test errors have been discussed in detail, and the influences of spurious modes on the directional couplers have been emphatically analyzed.

show abstract

Section: Parameter Design Of the Directional Couplermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

Weng¹,

Xia²,

Tian³

et al. 2022

Plasma Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Equation (5) (2) P k (m − ) is Output from n − Port If power P k (m − ) of three modes (k = 1, 2, 3) excited in main waveguide is output from the n − port of coupling arm n of coupler II, the total output power will be P (m − , n − ) = k=1,2,3 10 −[(C n,k=n + +p n,k =n + +d n,k )/10] P k (m − ) = k=1,2,3 R n,k K m,k P in R n,k = 10 −[(C n,k=n +p n,k =n +d n,k )/10] (6) where m = 1, 2, 3; n = 1, 2, 3. Eq.…”

Section: Input Signal P In From M −mentioning

confidence: 99%

“…The traditional calibrating method is to fabricate a single mode exciter or mode generator for every mode transmitted in the system. In principle, a mode converter can convert T E 10 mode in rectangular waveguide or TEM mode in coaxial line into the expected mode [6][7][8]; however, for higher order modes, it will make the process of conversion very complex, the length of converters be extremely long, and the manufacture be profoundly difficult. We have presented the way to calibrate coupling coefficients of the mode-selective coupler in detail in [5], which obtains coupling coefficients of each mode directly without a single mode exciter or mode generator.…”

Section: Introductionmentioning

confidence: 99%

The Calibration of the Coupling Coefficients of the Mode-Selective Coupler Without the Single Mode Exciter

Yue¹,

Wang²,

Xu³

et al. 2019

PIER Letters

View full text Add to dashboard Cite

As one of the important means in discriminating every mode in a high power microwave (HPM) multimode system, utilizing a mode-selective directional coupler to quantitatively analyze multimodes and power measurement has been proposed. The first step of this method is to calibrate the coupling coefficients of each coupled mode in the HPM system. Moreover, the conventional calibrating method must make the corresponding single mode exciter or mode generator. In this manuscript, a different calibrating method is presented by measuring the output power from each output port of two back-to-back identical mode-selective couplers, including the backward wave power, then the coupling coefficients of each coupled mode can be calculated by combining and solving equations. In this way, it is not necessary to manufacture the single mode exciter or mode generator for each mode in the HPM system, and also to repeat iteration solution; therefore, this method is more precise, convenient, efficient, and has lower cost than the current other methods.

show abstract

Design and experiment of a directional coupler for X-band long pulse high power microwaves

Bai

Zhang

et al. 2013

Review of Scientific Instruments

View full text Add to dashboard Cite

Higher power and longer pulse are the trend of the development of high power microwave (HPM), and then some problems emerge in measuring the power of HPM because rf breakdown is easier to occur under the circumstance of high power (the level of gigawatt) and long pulse (about 100 ns). In order to measure the power of the dominant TM₀₁ mode of an X-band long pulse overmoded HPM source, a directional coupler with stable coupling coefficient, high directivity, and high power handling capacity in wide band is investigated numerically and experimentally. At the central frequency 9.4 GHz, the simulation results show that the coupling coefficient is -59.6 dB with the directivity of 35 dB and the power handling capacity of 2 GW. The coupling coefficient is calibrated to be accordant with the simulation results. The high power tests are performed on an X-band long pulse HPM source, whose output mode is mainly TM₀₁ mode, and the results show that the measured power and waveform of the directional coupler have a good consistency with the far-field measuring results.

show abstract

Design of wide-band mode discriminator based on mode-selective coupling

Cited by 6 publications

References 7 publications

Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

The Calibration of the Coupling Coefficients of the Mode-Selective Coupler Without the Single Mode Exciter

Design and experiment of a directional coupler for X-band long pulse high power microwaves

Contact Info

Product

Resources

About