Yagi Antenna Design

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Nason Participant Join Date: Apr 2008 Posts: 3	Yagi Antenna Design 04/04/2008 2:03 PM
	I'm looking for an html or down-loadable program which will assist me in designing a yagi antenna intended for: (1) either 915MHz or 2.4GHz, (2)printed-circuit fabrication. The metrics I need are all of the physical dimensions (element size and spacing, element width on circuit board), bandwidth, gain, front/back ratio, and driving impedance. I realize this is quite a laundry list of capabilities so I'm willing to settle for the next best thing and/or pay. The downloadable program must run on Windows XP. Anybody have or can recommend a resource for practical design techniques for designing a printed-circuit Yagi at these bands? Most are directed to the HAM bands. __________________ For what does it profit a man to gain the whole world, and forfeit his soul? Mark 8:36
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	Pathfinder Tags: Printed-circuit Yagi

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frankd20 Guru Join Date: Jan 2007 Posts: 787 Good Answers: 52	#1 Re: Yagi Antenna Design 04/04/2008 2:19 PM
	I just did a search, and here is what I came up with This is just a general yagi calculator that you have to download, http://vk5dj.mountgambier.org/Yagi/Yagi.html This is also a yagi calculator but is an html type, but is also not specific to pcb. http://www.csgnetwork.com/antennae3ycalc.html This one is a pdf link to someone else's pcb yagi at 2.4 ghz, you will have to get the measurements from the pictures, but should be easy enough. https://gullfoss2.fcc.gov/prod/oet/forms/blobs/retrieve.cgi?attachment_id=226894&native_or_pdf=pdf
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frankd20 Guru Join Date: Jan 2007 Posts: 787 Good Answers: 52	#2 In reply to #1 Re: Yagi Antenna Design 04/04/2008 6:04 PM
	For no reason at all, I decided to take some measurements from the 2.4ghz Yagi picture in the pdf. The elements are about 3 cm wide, the driven element is 4.75cm long with a 1cm space, the reflector is 5.6cm long and is 1.7cm on center behind the driven element. The directors are spaced 2cm, 2.55cm and 2.75cm on center, and are 4.7cm 4.8cm and 4.35cm in length respectively. I doubt these are exact measurements, and since this is someone else's design, I don't know if they have some sort of patent, although I am sure you could make some changes. At the very least you can compare the numbers to what the software gives you.
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Stirling Stan Guru Join Date: Nov 2006 Location: KnoxTN Posts: 1485 Good Answers: 6	#3 Re: Yagi Antenna Design 04/04/2008 11:42 PM
	The correct name is Yagi-Uda antenna and Google and Dogpile searches will turn up all kinds of applicable information. __________________ Do Nothing Simply When a Way Can be Found to Make it Complex and Wonderful
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