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Waveguide Question - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


Mjwebster99
 Post subject: Waveguide Question
Posted: Fri Nov 18, 2005 8:43 am 
Ok I have another question. Im looking to build a waveguide for some car roof mounted antennas, though am unsure as to whether i require gain or not. The transmitter and receiver modules im using will give me a range of 100m, which i intend to maintain. I want to use a waveguide to increase the directionality of my antenna. If i had a simple aluminium box design surrounding my antenna that had dimensions above half the wavelength would that cause any loss in signal strength recieved or would it maintain the 100m range i require but over the specific direction dictated by the waveguide?
I need to keep the design as compact as possible, and given that im using 868Mhz UHF any specific flaring to increase gain, would make the guide far to big. Would a small amount of flaring increase the gain in any way?
Hope someone can halp.
Many thanks
Matthew Webster


 
  
 
kanling
 Post subject:
Posted: Fri Nov 18, 2005 12:37 pm 
 
Colonel
User avatar

Joined: Mon Jul 18, 2005 4:31 pm
Posts: 32
Location: Baltimore, MD
I can't imagine what you're trying to accomplish, but please post a picture when you are done.

With multiple horizontally polarized UHF antennas connected with waveguide, your car is going to look like a mobile air conditioning plenum. :-D


 
   
 
mjwebster99
 Post subject:
Posted: Fri Nov 18, 2005 2:19 pm 
It does sound a bit crazy, I know. Im hoping to keep any waveguides used to be as compact as possible. I just need to guage how big it would be to be applicable to 868Mhz UHF.
I really hope my car doesn't end up looking like a mobile air conditioning plenum. I really do! :shock:




Posted  11/12/2012

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