2012
DOI: 10.1007/s10762-012-9883-0
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Numerical and experimental investigation of a 5-port mitre-bend directional coupler for mode analysis in corrugated waveguides

Abstract: A directional coupler array with 5 ports integrated into a mitre bend for corrugated waveguide transmission lines at 140 GHz has been manufactured. The design is reviewed, and calculations on the performance for in-situ power measurement and mode discrimination are shown. Emphasis is given on detection of errors in alignment of the transmission system. Experimental tests are performed to benchmark the calculations. The results confirm the predictions and show that such a coupler is a viable tool for power meas… Show more

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Cited by 17 publications
(10 citation statements)
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“…In order to achieve high coupling, the propagation of unwanted modes must also be considered. For the TE 11 mode coupler, the three subsequent higher order modes (TM 01 , TE 21 , and TE 01 ) are also evaluated. The only unwanted mode that will propagate is TM C 01 .…”
Section: Multiple-hole Input Couplermentioning
confidence: 99%
See 1 more Smart Citation
“…In order to achieve high coupling, the propagation of unwanted modes must also be considered. For the TE 11 mode coupler, the three subsequent higher order modes (TM 01 , TE 21 , and TE 01 ) are also evaluated. The only unwanted mode that will propagate is TM C 01 .…”
Section: Multiple-hole Input Couplermentioning
confidence: 99%
“…The W -band device uses a threefold helically corrugated interaction region (HCIR) [5] as opposed to a standard smooth bore cavity. The HCIR couples the TE 21 mode to the first spatial harmonics of the TE 11 mode to generate an operating eigenwave, improving the bandwidth range for the gyro-TWA operation [6]. Research on gyrodevices at the University of Strathclyde has demonstrated excellent results in achieving high-power and wide-frequency tunability.…”
Section: Introductionmentioning
confidence: 99%
“…Such measurement consequently had to be performed in the atmosphere at several positions in the transmission line using lower power and short pulse irradiation. As a real-time mode analyzer, a 5-port miterbend directional coupler for mode analysis was developed and tested in the corrugated waveguide [7,8]. However, mismatch between the mmw axis and the waveguide axis possibly occurs during high-power and CW operation.…”
Section: Introductionmentioning
confidence: 99%
“…Such measurement consequently had to be performed in the atmosphere at several positions in the transmission line using lower power and short pulse irradiation. As a realtime mode analyzer, a 5-port miterbend directional coupler for mode analysis was developed and tested in the corrugated waveguide [7,8]. However, mismatch between the mmw axis and the waveguide axis possibly occurs during high power and CW operation.…”
Section: Introductionmentioning
confidence: 99%