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

Does indoor need a bigger antenna?

Status
Not open for further replies.

bb

Newbie level 6
Joined
May 17, 2005
Messages
11
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,377
I am testing a Discone antenna indoor.. Is it necessary to make the size of antenna bigger by decresing the frequency?? I currently testing discone where frequency is 1GHz.. but cannot get the radiation pattern.. Thx for help..
 

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
You are going to always have problems with antenna measurements indoors. First there is the reflections from walls and then there is the far field distance. At leas the second of these can be overcome if the frequency is high enough.
 

vfone

Advanced Member level 5
Joined
Oct 10, 2001
Messages
5,141
Helped
1,526
Reputation
3,053
Reaction score
1,127
Trophy points
1,393
Activity points
32,532
To answer to your question, yes, is necessarily to make the antenna larger for lower frequencies (actually this is valid for all the antennas).
Here you can find the dimensions:
http://www.northcountryradio.com/Articles/Figures/dis1.gif

and this is the pattern that you have to get for Discone in open-space or using an anechoic chamber
 

teckyiau

Newbie level 4
Joined
Jan 8, 2005
Messages
6
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
48
just out of interest, can you let me know how are you testing your antenna?
 

designtech

Member level 1
Joined
Feb 9, 2006
Messages
38
Helped
2
Reputation
4
Reaction score
0
Trophy points
1,286
Activity points
1,569
hi i am also interested in antenna design..whats a good book to start with?
 

tomcat_x

Member level 1
Joined
Nov 26, 2004
Messages
41
Helped
6
Reputation
12
Reaction score
0
Trophy points
1,286
Activity points
356
the multipath fading , shadowing and interference

make the antennna measurement perform badly indoor .

Normally , the bigger antenna make the antenna specification better .

The best place for measuring antenna indoor is to measure it in chamber .
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top