feed methods?

[avoy]

In Kraus book on antenna
he mentioned two types of feeding

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1488549241/tips/feed_g1ujwf.psd[/url]

But what will be the difference for these two methods?

 

[VEBill]

Your .psd file is in a proprietary file format. Photoshop.

Not everybody would be able to open this.

It would be better to extract the same image and paste it in-line using the image paste buttons.

 

[MacGyverS2000]

I just used an online viewer...

Dan - Owner

http://www.Hi-TecDesigns.com

 

[VEBill]

Was it interesting?

 

[IRstuff]

As a GIF

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

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[VEBill]

 

[VEBill]

The first a) is just a loop fed with balanced transmission line. Nothing complicated.

The second b) seems to be just a (thicker) loop fed at the top with coax snuck through one arm.

The diagram for b) lacks detail. At first I thought it might be a shielded loop, but on closer inspection it's not. There's a good discussion of shielded loops here, for ref. But it's not that.

 

[khiggler]

Feed b) will radiate from the outer jacket of the cable. Hence it will affect your antenna pattern. Feed a) needs a balun to make it work normally.