Wideband crossed-guide waveguide directional couplers

Meyer, P.; Kruger, J.C.

doi:10.1109/mwsym.1998.689368

Cited by 16 publications

(7 citation statements)

References 6 publications

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“…Simulation result shows that the response is narrowband, with coupling varying more than 15 dB across the full waveguide band. Wideband coupler can be designed using reduced-height waveguide [13]. This paper shows a coupling of 10 dB + 0.8 dB over a bandwidth of 10% can be achieved in crossed-guide coupler using reduced-height waveguide in W band.…”

Section: Introductionmentioning

confidence: 91%

“…In literature, design data of crossed-guide cross-slot directional coupler is reported upto microwave frequencies [9][10][11][12][13]. Broad-wall metal-insert slot couplers are reported in [14] for millimeter-wave applications, but no design data on waveguide crossed-guide crossed slot coupler at millimeterwave frequency range is reported in standard literature.…”

Section: Introductionmentioning

confidence: 99%

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Computer aided design of broad-band rectangular waveguide directional coupler at W band

Mukherjee

Sarkar

Bhanja

et al. 2013

2013 IEEE Applied Electromagnetics Conference (AEMC)

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Reduced-height rectangular crossed waveguide cross-slot directional coupler has been designed at W band (75 GHz-110GHz) with computer aided design approach and experimentally verified. The coupler has been simulated and optimized with 3D full wave electromagnetic field simulator HFSS. Coupling of 10.5 dB is achieved with good directivity within a bandwidth of more than 10%. The experimental result closely matches with the simulation.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Computer aided design of broad-band rectangular waveguide directional coupler at W band

Mukherjee

Sarkar

Bhanja

et al. 2013

2013 IEEE Applied Electromagnetics Conference (AEMC)

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“…no moving parts and the space constraints. To achieve this, a calibration system with a stable pilot signal injected through a directional coupler (Meyer and Kruger, 1998) The 557 GHz horn is an exact scaled version of the 183 GHz horn but no measurements were performed because of the absence of suitable equipment at this frequency. The 557 GHz horn was produced by Radiometric Physics GmbH (Radiometric Physics Gmbh) by electroforming and the horn performance is expected to be the same as for the 183 GHz horn relying on exact scaling effect.…”

Section: The 183 Ghz Rf Channel Calibration Systemmentioning

confidence: 99%

PHOCUS radiometer

2012

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Abstract. PHOCUS -Particles, Hydrogen and OxygenChemistry in the Upper Summer Mesosphere is a Swedish sounding rocket experiment, launched in July 2011, with the main goal of investigating the upper atmosphere in the altitude range 50-110 km. This paper describes the SondRad instrument in the PHOCUS payload, a radiometer comprising two frequency channels (183 GHz and 557 GHz) aimed at exploring the water vapour concentration distribution in connection with the appearance of noctilucent (night shining) clouds. The design of the radiometer system has been done in a collaboration between Omnisys Instruments AB and the Group for Advanced Receiver Development (GARD) at Chalmers University of Technology where Omnisys was responsible for the overall design, implementation, and verification of the radiometers and backend, whereas GARD was responsible for the radiometer optics and calibration systems.The SondRad instrument covers the water absorption lines at 183 GHz and 557 GHz. The 183 GHz channel is a sidelooking radiometer, while the 557 GHz radiometer is placed along the rocket axis looking in the forward direction. Both channels employ sub-harmonically pumped Schottky mixers and Fast Fourier Transform Spectrometers (FFTS) backends with 67 kHz resolution.The radiometers include novel calibration systems specifically adjusted for use with each frequency channel. The 183 GHz channel employs a continuous wave CW pilot signal calibrating the entire receiving chain, while the intermediate frequency chain (the IF-chain) of the 557 GHz channel is calibrated by injecting a signal from a reference noise source through a directional coupler.The instrument collected complete spectra for both the 183 GHz and the 557 GHz with 300 Hz data rate for the 183 GHz channel and 10 Hz data rate for the 557 GHz channel for about 60 s reaching the apogee of the flight trajectory and 100 s after that. With lossless data compression using variable resolution over the spectrum, the data set was reduced to 2 × 12 MByte.The first results indicate that the instrument successfully performed measurements of the mesospheric water profile as planned. However, the temperature environment for the instruments showed more extreme behaviour than expected and accounted for. Consequently, the results of the calibration and the final data reduction will need careful treatment. Further, simulations through finite element method (FEM), modelling and direct measurements of the simulated thermal environment and its impact on the instrument performance are described, as well as suggestions for improvements in the design for future flights.

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“…Crossed‐waveguide directional couplers are usually used due to their compact structures. Theory analysis of cross‐guide couplers was well studied in the literature . In these structures, the cross‐apertures are employed to offer flat coupling and high isolation.…”

Section: Introductionmentioning

confidence: 99%

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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Wideband crossed-guide waveguide directional couplers

Cited by 16 publications

References 6 publications

Computer aided design of broad-band rectangular waveguide directional coupler at W band

Computer aided design of broad-band rectangular waveguide directional coupler at W band

PHOCUS radiometer

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

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