Can grooved and ungrooved waveguides be safely be used together, e.g. in outside weather? Like PBR and UBR?
On Sun, Sep 21, 2014 at 12:10 PM, Chuck McCown via Af <af@afmug.com> wrote: > Waveguide is a broadband bandpass filter. You can couple one size to > another as long as there is overlap in the pass band. Go to low in > frequency and the waveguide just blocks the signal. The cut off frequency. > It is not a brick wall filter. Normally the cut off frequency is something > like the 1 dB mismatch loss frequency, go lower and the loss goes up > quickly. > > Different problem in going too high. > > To use my photon analogy: > > Photons simply will not fit down the tube if they are too large (low > frequency). Go too high in frequency and you get other than single file > photons trying to get town the tube. Like two abreast, two rows two > columns etc etc. > > Those are called higher order modes and you can use them if you take care > of launching and receiving the signal in a low loss high return loss manner. > > http://www.rfcafe.com/references/electrical/waveguide-chart.htm > > Then there are the non rectangular waveguides. Ridge waveguide is > physically smaller than rectangular waveguide. Circular is good for dual > pol and is exceedingly low loss but extra care has to be taken to prevent > polarization rotation. > > -----Original Message----- From: cstanners--- via Af > Sent: Saturday, September 20, 2014 6:41 PM > To: Jason McKemie via Af > Subject: [AFMUG] Waveguide compatibility info? > > Does anyone have resources/FAQs/etc to understand Waveguide compatibility? > > >
