Theoretical and Experimental Analysis of a Waveguide Mounting Structure

Eisenhart, R.L.; Khan, P.J.

doi:10.1109/tmtt.1971.1127612

Cited by 186 publications

(41 citation statements)

References 9 publications

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“…In comparison, the source impedances of the 0.65-and 0.88-THz half-height waveguide designs are much less frequency dependent (although they retain significant reactive components). These results are consistent with those obtained previously in [17] and [18], both in theoretical calculations and in experiment.…”

Section: Mixer and Sis Device Designsupporting

confidence: 94%

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Jackson

Lange

Zijlstra

et al. 2006

IEEE Trans. Microwave Theory Techn.

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Section: Mixer and Sis Device Designsupporting

confidence: 94%

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Jackson

Lange

Zijlstra

et al. 2006

IEEE Trans. Microwave Theory Techn.

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“…18,20 An important reason for the popularity of this kind of design is the convenience with which the active device can be biased and the IF signal extracted. Unfortunately, this kind of "double-sided" (balanced) probe exhibits a rather poor RF bandwidth (≤ 15%), when constructed in full-height waveguide.…”

Section: Tunerless Full-height Waveguide Mixers With Large Fractionalmentioning

confidence: 99%

Heterodyne instrumentation upgrade at the Caltech Submillimeter Observatory

Kooi

Kovács

Bumble

et al. 2004

Millimeter and Submillimeter Detectors for Astronomy II

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Balanced receivers are under development at the Caltech Submillimeter Observatory (CSO) for the 230/460 GHz and 345/660 GHz atmospheric windows. The mixers are tunerless, implemented in a balanced configuration, have a 4-8 GHz IF, and can be used in dual frequency observation mode. As shall be seen, the balanced arrangement provides a high level of amplitude noise immunity and allows all of the available LO power to be used. In turn, this permits complete automation of the receivers by means of synthesized LO source(s). A disadvantage of balanced mixers is, perhaps, that the sidebands at the IF remain convolved (DSB), unlike sideband separating (2SB) receivers. The latter, however are unbalanced and do not have the noise and LO injection advantages of balanced mixers. For the CSO, balanced mixers covering the range 180-720 GHz were judged most promising to facilitate many of the astrophysical science goals in the years to come.In parallel, a dual polarization 280-420 GHz continuous comparison (correlation) receiver is in an advanced state of development. The instrument has two beams on the sky; a reference and a signal beam. Using only cooled reflecting optics, two polarizing grids, and a quadrature hybrid coupler, the sky beams are coupled to four tunerless SIS mixers (both polarizations). The 4-12 GHz mixer IF outputs are, after amplification, correlated against each other. In principle, this technique results in flat baselines with very low RMS noise, and is especially well suited for high redshift Galaxy work.Not only do these changes greatly enhance the spectroscopic capabilities of the CSO, they will also enable the observatory to be integrated into the Harvard-Smithsonian Submillimeter Array (SMA), as an additional telescope.Keywords: Balanced mixer theory, continuous comparison receiver, radial probe, full-height waveguide to thinfilm microstrip transition, split-block, high current density superconducting-insulating-superconducting (SIS) tunnel junction, broad bandwidth quadrature waveguide hybrid, DC-break, IF match, Wilkinson in phase power combiner, Low noise amplfier (LNA), 4-8 GHz intermediate frequency (IF).

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“…The second development that had a tremendous effect on a generation of microwave engineers was 0018-9480/02$17.00 © 2002 IEEE Collin's Foundation of Microwave Engineering, which presented a formalism for treating distributed structures as circuit elements [25]. The third significant development was the work of Eisenhart and Khan [26] that presented an approach to modeling waveguide-based structures as circuit elements. In that paper, it was shown that quite sophisticated and accurate models could be developed for a three-dimensional waveguide system.…”

Section: Origins Of Rf and Microwave Circuit Modelingmentioning

confidence: 99%

Computer-aided design of RF and microwave circuits and systems

Steer

Bandler

Snowden

2002

IEEE Trans. Microwave Theory Techn.

125

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Abstract-The history of RF and microwave computer-aided engineering is documented in the annals of the IEEE Microwave Theory and Techniques Society. The era began with elaborate analytically based models of microwave components and simple computer-aided techniques to cascade, cascode, and otherwise connect linear component models to obtain the responses of linear microwave circuits. Development has become rapid with today's computer-oriented microwave practices addressing complex geometries and with the ability to globally model and optimize large circuits. The pursuit of accurate models of active devices and of passive components continues to be a key activity.

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Theoretical and Experimental Analysis of a Waveguide Mounting Structure

Cited by 186 publications

References 9 publications

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Low-noise 0.8-0.96- and 0.96-1.12-THz superconductor-insulator-superconductor mixers for the herschel space observatory

Heterodyne instrumentation upgrade at the Caltech Submillimeter Observatory

Computer-aided design of RF and microwave circuits and systems

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