appropiate blun design for yagi at 2.4 ghz
 

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?
As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

Regards,
Gaurav jain

On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

"Wes Stewart" wrote in message
...
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?



"Wes Stewart" wrote in message
.. .
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?
As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

You might also consider a loop Yagi.

http://cheatthezone.tripod.com/wireless/loopyagi.html

Google for others.

The loop has a "built-in" balun.

i would assume that since you are working with microwaves you have micro
tools appropriate for the job.

"Wes Stewart" wrote in message
...
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?



"Wes Stewart" wrote in message
. ..
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

Wes:

How about a "conductive pen", one whos ink contains micro-fine silver
particles, just draw the darn thing on an non-conductive surface and
hook up the feedline!!!

Warmest regards,
John

"Wes Stewart" wrote in message
...
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use
a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?



"Wes Stewart" wrote in message
. ..
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna
business
for just past 2 months.I am constantly looking for an appropiate
balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If
yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as
it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

"Wes Stewart" wrote in message
...
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?


Etch it on pc board. Come to think of it - at that wavelenth - simply etch
the entire antenna on a board.

73
Roger ZR3RC


"Wes Stewart" wrote in message
. ..
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

thats one way, or just etch it from circuit board.

"John Smith" wrote in message
...
Wes:

How about a "conductive pen", one whos ink contains micro-fine silver
particles, just draw the darn thing on an non-conductive surface and hook
up the feedline!!!

Warmest regards,
John

"Wes Stewart" wrote in message
...
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?



"Wes Stewart" wrote in message
...
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna business
for just past 2 months.I am constantly looking for an appropiate balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

.... copper foil tape and a small soldering iron?

John

"Roger Conroy" wrote in message
...

"Wes Stewart" wrote in message
...
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use
a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?


Etch it on pc board. Come to think of it - at that wavelenth - simply
etch the entire antenna on a board.

73
Roger ZR3RC


"Wes Stewart" wrote in message
...
On 18 Jun 2005 04:13:38 -0700, "khanna"
wrote:

hi,
I am designing a yagi antenna at 2.4 ghz .I am in this antenna
business
for just past 2 months.I am constantly looking for an appropiate
balun
design.
Could anybody help me in finding these question-

Which design will suit for my purpose ?(ferrite core/ferrite rod
or
any other thing?

At this frequency I would not consider ferrites.

As per my information 1:1 current balun may suit .Am I right ? If
yes
then any other specification about it ?
where can I find complete DESIGN DETAIL about this perticular balun
(this is a bigger problem for me).

I want to request all antenna studs ,please help me. I have just 10
days to finish this project.

The slotted coax balun would be an option. I don't have a ready
reference, but you might look for the NBS standard gain antenna, as
it
uses such a balun.

Also here is another possibility:

http://www.atnf.csiro.au/projects/sk...dCoaxBalun.pdf

On Sat, 18 Jun 2005 16:32:38 -0000, "Dave" wrote:

i would assume that since you are working with microwaves you have micro
tools appropriate for the job.


The slotted coax balun that I suggested is a viable possibility.

The half-wave balun that you proposed (I suspect before you actually
noted the frequency) is not. The application cries out for semi-rigid
coax and bending that half-wave balun without exceeding the bend
radius limitation is an issue. Similar problems lurk with a gamma
match which is lousy at vhf and would be a really bad idea at 2.4 GHz.



"Wes Stewart" wrote in message
.. .
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?

On Sat, 18 Jun 2005 20:20:55 +0200, "Roger Conroy"
wrote:


"Wes Stewart" wrote in message
.. .
On Sat, 18 Jun 2005 14:08:46 -0000, "Dave" wrote:

you could use a gamma match that requires no balun. or you could use a T
match with a 1/2 wave phasing line that acts as the balun.

Hmmm. Since the dipole is going to be about 1.4 inches long, how do
you propose to do this?


Etch it on pc board. Come to think of it - at that wavelenth - simply etch
the entire antenna on a board.


IMHO, designing and building a Yagi at 2.4 GHz is a bad idea from the
beginning but I assume the OP has an assigned project and he's stuck
with it. If not, he should be building a horn.

Designing one on microstrip is an even bigger can of worms. (An
American idiom similar to Pandora's Box)