Thank you for visiting RF Cafe! Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums RF Cafe Homepage Thank you for visiting RF Cafe!

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

 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 
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

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Kirt Blattenberger,

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !