For a hydrogen-line feed made from rectangular box section, the waveguide only needs to be long enough to establish the TE10 mode and accommodate the probe/backshort arrangement. A useful rule…
Dimensions of WR650 waveguide for hydrogen. For the neutral hydrogen line at 1420.4058 MHz, WR-650 is the standard rectangular waveguide size most commonly used. Its dimensions are: Dimension Inches Millimetres…
A Yagi works by a different mechanism from a dish or horn, but the same underlying principle still applies: For any antenna, gain and effective aperture are linked by: where:…
The commonly quoted lambda/4 criterion is not really a limit on the flare angle itself; it is a limit on the resulting path-length or surface-position error caused by a construction…
On Monday, May 25, 2026 at 1:09:30 AM UTC-7 Andrew Thornett wrote: Can a horn be made larger simply by adding an extension to end of same flare angle, or does…
Answer by Jason Burnfield: On Tue, May 26, 2026 at 1:33 AM Andrew Thornett wrote: Can I ask you for your back of envelope dB calculation on the trace from my…
For a WR-650 waveguide at the 1420 MHz hydrogen line, the internal dimensions need to be about 165 mm × 82.5 mm (6.5″ × 3.25″). That means you’re looking for…
Yes, a pyramidal horn antenna can generally be made larger by adding an additional flared section to the front, but there are some important caveats. A horn antenna works by…
https://www.ece.mcmaster.ca/faculty/nikolova/antenna_dload/current_lectures/L18_Horns.pdf
Engineering-style comparison of the two—useful if you’re deciding for SDR work like interferometry or radio astronomy. Compared devices Key specifications comparison Feature Frequency range 24–1700 MHz native 24–1800 MHz (similar…
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