Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Where can I find a low cost EMC antenna?

Status
Not open for further replies.

mImoto

Full Member level 4
Joined
Feb 21, 2002
Messages
211
Helped
4
Reputation
8
Reaction score
1
Trophy points
1,298
Activity points
1,746
Low cost EMC antenna?

Hello,

Does anyone how can I make or where to buy a low cost antenna (1MHz to 2GHz more or less).

Thansk in advance,

mimoto
 

Hishamsaleh

Full Member level 1
Joined
Jan 6, 2003
Messages
98
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
969
what a huge range you are talking about!!!

1 MHz.... this is like radio antenna...
2 GHz... like sat, mobile antenna...

also... where do you want to buy it from?? usa?

if you want! i think best think is to tell us what freq. do you want to wark on and we will tell you what is best.
 

flatulent

Advanced Member level 5
Joined
Jul 19, 2002
Messages
4,629
Helped
489
Reputation
980
Reaction score
150
Trophy points
1,343
Location
Middle Earth
Activity points
46,689
several antennas

You will need sevral antennas to cover this range.

For the HF range 1-30 MHz you can use a length of wire.

For the other ranges you can make several discone antennas out of stiff wire and a coaxial socket. These cover about a 4-1 frequency ratio range before they start having beam patterns away from the horizon.
 

bappa_banga

Junior Member level 1
Joined
Feb 19, 2003
Messages
15
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
india
Activity points
157
theoretically its not posible to have such a huge range in a single antenna, you have to have multiple antennas
 

mImoto

Full Member level 4
Joined
Feb 21, 2002
Messages
211
Helped
4
Reputation
8
Reaction score
1
Trophy points
1,298
Activity points
1,746
I would like to use for EMC. I asked for 2-Ghz bandwith becuase my spectrum analyzer has a range until 2Ghz.

Which are the common antennas for EMC measurements. I would like to use mainly for improving my cable assembling, etc not for passing EMC test etc. Which are more or less the price?

Thanks a lot,

mimoto
 

flatulent

Advanced Member level 5
Joined
Jul 19, 2002
Messages
4,629
Helped
489
Reputation
980
Reaction score
150
Trophy points
1,343
Location
Middle Earth
Activity points
46,689
common antennas

EMC test laboratories use a set of antennas for different frequency ranges.

For low they use a caged bow tie with calibration factors for each frequency.
For the mid they use a log periodic with calibration factors for each frequency. For high they use waveguide horns with calibration factors for each frequency. They take the output from the spectrum analyzer and put it into a computer which stores the calibration factors and draws a graph of true signal strength vs frequency.
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top