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Yagi Antenna

05/13/2016 10:30 PM

I've been searching the net for a proven Yagi antenna and yet to find one that's reliable. And was wondering if anyone has a build plan/ schematic for one that they've used or have. I'm hitting the road in about 2 weeks and be nice to stay in touch with CR4®

Dan

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Pathfinder Tags: yagi antenna
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#1

Re: Yagi antenna

05/13/2016 11:13 PM

ARRL Antenna Book is where I'd start.

I played around with antennas in the 70's.

Not sure what frequency, etc. you're wanting.

Much has happened since I was involved.

Cell phone may be the best bet these days.

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#6
In reply to #1

Re: Yagi antenna

05/15/2016 3:05 AM

I didn't mean ignore your link Lyn. In fact that's a great site. It was the early '70s when I was playing with radios and antennas too. Your right, a lot has changed since then. Those were the days, huh? Life was simple back then. Once when I get my girlfriend to quit nagging me about packing up I'm going to spend some time and check out that link in detail. Thanks Lyn

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#2

Re: Yagi antenna

05/14/2016 12:23 AM

What bandwidth, what range? You mean as a wifi booster?

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#3
In reply to #2

Re: Yagi antenna

05/14/2016 2:51 AM

Thanks SE, yeah, for wifi, don't know how I missed that one on eBay. But I was wanting to build my own, (duck away from the girlfriend) Hard to beat that tho!

If anyone has any plans for a WiFi Yagi I'd appreciate if you'd share it with me, (us)

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#4
In reply to #3

Re: Yagi antenna

05/15/2016 12:09 AM
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#5
In reply to #4

Re: Yagi antenna

05/15/2016 2:50 AM

Cool! Kinda like I've looking for and the time frame for the build. Thanks again SE

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#7
In reply to #4

Re: Yagi antenna

05/15/2016 5:18 AM

Thanks for that great link! Brings back many memories.

I studied antennas years ago for the FCC exam,but the tree of my memory has grown moss on the north side since then... been over 45 years..use it or lose it they say.

I flunked the first try,because the exam was very heavy on antennas.

I was determined not to make the same mistake again,so I made it a focus of my study time.

I was prepared for anything about antennas on the next exam.

Wouldn't you know it...there was hardly anything about antennas on the next exam..

This may inspire me to get back into refreshing my memory and building a few for self and friends.

The Fractal antennas seem to be the new wave for high gain and directional UHF

nowadays,and they scale very nicely.

I haven't built one yet,but there are plenty of DIY sites for doing so.

Thanks again!

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Guru

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#9
In reply to #3

Re: Yagi antenna

05/15/2016 8:29 AM

You can try a "cantenna" too...

http://www.turnpoint.net/wireless/cantennahowto.html

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Guru
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#10
In reply to #9

Re: Yagi antenna

05/15/2016 3:10 PM

Hi Qqberci, I've tried couple of can antennas and wasn't really satisfied with the results and why I'm looking for a Yagi design. Your link has the "can calculator" that I didn't have when I tried building the other can antennas, so I'm going try it and see if I can dial in the wavelength. Thanks, Dan

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#8

Re: Yagi Antenna

05/15/2016 6:43 AM

LTE transmits at a bandwidth 1~2 GHz, then probably best antenna would be close to λ=6~15 cm wavelenth

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#11

Re: Yagi Antenna bandwidth

05/24/2016 2:49 PM

Does the DIAMETER of the elements increase the bandwidth of an antennas elements by, I recall lowering their Q?

IE if I make all the elements one inch d Vs 1/8" will I have a wider curve of gain over frequency?

Thanks

Michael

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#12
In reply to #11

Re: Yagi Antenna bandwidth

05/26/2016 11:20 PM

Changing the diameter of the elements changes the characteristic impedance of the antenna. The length of the fed element (radiator) determines the center frequency, the length of the wider elements (reflectors) determines the lower frequency while the length of the shorter elements (directors) determines the higher frequency responses.

If you're looking for a uniform gain over a wide bandwith you might consider a log-periodic antenna; it looks like a yagi but each element is active and fed off of a common feedline.

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dj95401 (4); HiTekRedNek (1); lyn (1); Michael Rogers (1); Peterpipper (1); Qqberci (1); RAMConsult (1); SolarEagle (2)

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