How to design an Inset Feed for microstrip Antenna?

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si14

Joined: 27 Sep 2006
Posts: 1061
Helped: 664
Location: North America

13 Feb 2008 7:42 inset feed

Dear Friends,

Due to some difficulties, I changed my design procedure to Inset Feed. I am designing an Active Antenna working about 2.5 to 3.5 GHz.

For my frequency, I evaluate my patch dimensions, but when I put the feed line and connect it to the patch, fr changes!

I was wondering if it is possible for you to introduce a reference to me. Is there any reference in which I could get some information about designing this kind of antennas?

Thank you for your consideration.

atul_microwaves_antenna

Joined: 06 Jul 2007
Posts: 90
Helped: 8

14 Feb 2008 7:41 antenna inset feed method technique

coaxial feed are easy as compared to Inset feed.
You can check Bhatia book on Microstrip antenna published by Artech House.It is a good reference for microstrip feed design.

si14

Joined: 27 Sep 2006
Posts: 1061
Helped: 664
Location: North America

14 Feb 2008 11:30 inset fed microstrip

Dear atul,

Thank you very much for your reply.
But, due to fabrication problem, I should design Inset fees. Do you know any reference in this regard?

Many Thanks.

balaguru thavamani

Joined: 08 Nov 2006
Posts: 267
Helped: 30

14 Feb 2008 13:01 inset fed patch anteena

refer to the below doc ithink it will help u

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leaps

Joined: 10 Jul 2008
Posts: 47
Helped: 1

03 Feb 2009 22:38 microstrip insed-fed antenna

i am designing the patch to operate at 10GHz using inset feed method now the problem i am facing is when i change the width Wf of the insed feed the resonant frequancy chages can anyone pleasee tell what should be the value for Wf .the best value of s11 i have been able to achieve is -20db i need to improve that further

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mounika

Joined: 23 Jun 2009
Posts: 8
Location: hyderabad

25 Jun 2009 6:39 inset fed

how to i calculate value of Wf can anyone help me please

Added after 4 minutes:

how do i calculate the valued of L,W,Wf.can any help me please. do we have any formula

avinashnv

Joined: 12 Jun 2009
Posts: 5

25 Jun 2009 16:35 how to calculate inset gap

Hello

To calculate the value of wf i.e the width of microstrip line, we can refer Antenna theory-analysis and design by balanis, page num 734, This book is good for beginners. wf is related microstrip line feed's characteristic impedance (Zc).

Varying microstrip line width introduces junction capacitance which is the cause for variation of resonant frequency.

Regards
Avinash

mounika

Joined: 23 Jun 2009
Posts: 8
Location: hyderabad

26 Jun 2009 9:34 inset microstrip feed

thankyou avinash

Added after 2 hours 34 minutes:

hey i got balanis book from library.The book you are is wch edition

Added after 2 minutes:

the book wch you are talking is of wch edition(pg 734)

avinashnv

Joined: 12 Jun 2009
Posts: 5

26 Jun 2009 15:12 design of a patch with inset feed using ads

Hello mounika

I referred to second edition.

Regards
Avinash

cipankurus

Joined: 18 Jun 2009
Posts: 3
Location: malaysia

30 Jun 2009 8:07 balanis microstrip

dear friends,

can some1 help me how to design network models for inset fed microstrip antenna..I'm very confuse how to generate the model in terms of inductance and capacitance..

my design is at 2.4 GHz frequency band..

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30 Jun 2009 8:07 Ads

mounika

Joined: 23 Jun 2009
Posts: 8
Location: hyderabad

01 Jul 2009 8:02 design of microstrip antenna with inset fed

hi,

can anyone tell me how to design array using inset feed.

regards

cipankurus

Joined: 18 Jun 2009
Posts: 3
Location: malaysia

05 Jul 2009 17:13 inset feed microstrip

mounika wrote:

hi,

can anyone tell me how to design array using inset feed.

regards

dear mounika,

u can refer balanis book..antenna theory 3rd edition page 866..
this page describe clearly how to design array using either tapered line or quarter wavelength transfomer..

rshirodk

Joined: 28 May 2009
Posts: 4

13 Jul 2009 17:44 inset fed method

You can use a Half the wavelength as Length(L)
L=lambda/2=c/(2*Er*Fd)
where c=light velocity.
Er=dielectric constant of the substrate.
Fd= design frequency.

use the relation W*L=1.25 for the width of the Patch.

Now coming to the inset. You could have any value ranging from L/3 to L/2 for a good approximateed response.
So if are using any Optimization tool, use L/3 and L/2 as the limits.

This method has been tested for frequency frequencies around 2GHz.
Check for your frequencies and let me know if it works.

Thanks
Rakesh

simazafrani

Joined: 24 Feb 2009
Posts: 1

30 Jul 2009 9:16 design of inset feed line

Hi rshirodk...

hmm.. confused with the equation below to calculate size inset feed of patch?

Quote:

for equation above W*L =1.25, W will be >>L, am i right?

i also wanna know how calculate the gap (slot for inset feed) between feed and patch

TQVM Very Happy