We describe a waveguide to thin-film microstrip transition for highperformance submillimetre wave and teraherz applications. The proposed constant-radius probe couples thin-film microstrip line, to fullheight rectangular waveguide with better than 99% efficiency (VSWR ≤ 1.20) and 45% fractional bandwidth. Extensive HFSS simulations, backed by scale-model measurements, are presented in the paper...

The population of distant dusty submm-luminous galaxies was first detected last year [19]. Forms of evolution required to account for both this population and the intensity of background radiation have now been determined [6], and are used to investigate the most efficient observing strategies for future surveys. Submm-wave galaxy surveys detect the redshifted thermal far-infrared radiation emi...

Submillimetre maps of NGC 891 have been obtained with the PRONAOS balloonborne telescope and with the ISOPHOT instrument on board the ISO satellite. In this article, we also gather data from IRAS and SCUBA to present the complete submillimetre spectrum of this nearby edge-on spiral galaxy. We derive submillimetre emission profiles along the major axis. The modified blackbody fits, assuming a si...

We have obtained the first continuous disk averaged spectrum of Mars from 450 to 1550 Ghz using the Herschel-SPIRE Fourier-transform spectrometer. The spectrum was obtained at a constant resolution of 1.4 GHz across the whole band. The flux from the planet is such that the instrument was operated in “bright source” mode to prevent saturation of the detectors. This was the first successful use o...

Samples of high-redshift galaxies are easy to select in the millimetre/submillimetre (mm/submm) waveband using sensitive telescopes, because their flux density–redshift relations are expected to be flat, and so the selection function is almost redshift-independent at redshifts greater than 0.5. Source counts are expected to be very steep in the mm/submm waveband, and so the magnification bias d...

In this paper we consider the Gaussian beam mode analysis of imaging arrays on submillimetre-wave radio telescopes. We show how it is possible to describe any of the off-axis beams generated by the array in terms of the same on-axis beam mode set. The mapping process can be easily analysed using a modal approach.