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Waveguide Question - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


 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


 
  
 
 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


 
   
 
 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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