Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!
Innovative Power Products Couplers

Waveguide Question - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

NOTICE: The original RF Cafe Forum is available again for reading, and the new RF Cafe Blog is an active board.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster

 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

KR Electronics (RF Filters) - RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
Axiom Test Equipment - RF Cafe
RIGOL Technologies (test equipment) - RF Cafe
RF Cascade Workbook 2018 by RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free


About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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: