Antenna - Theory .com: The Antenna Site

Antenna Basics Antenna Types Smith Charts Antenna Measurements

antenna-theory.com :: View topic - why we can only use limited bandwith?
antenna-theory.com Forum Index antenna-theory.com
Antenna Theory
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

why we can only use limited bandwith?

 
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory
View previous topic :: View next topic  
Author Message
sflee
Antenna-Theory.com Newbie


Joined: 10 Feb 2011
Posts: 1

PostPosted: Thu Feb 10, 2011 12:14 pm    Post subject: why we can only use limited bandwith? Reply with quote

hi everyone, i am a new comer of this forum and i am not so familiar with antenna.

i would like to ask a question and hope someone can answer me.

my question is why we can only use limited bandwith?

someone on the internet say that when the frequency become higher, then the length of the antenna has to become shorter which base on the wave-length is decreasing.

i would like to ask what is the relationship between the wave-length and the antenna and why they have such kind of relation.
Back to top
View user's profile Send private message
Schubert
Antenna Wizard


Joined: 08 Apr 2009
Posts: 161

PostPosted: Thu Feb 10, 2011 7:01 pm    Post subject: Reply with quote

The short answer is that the impedance of a very small antenna (less than half-wavelength) varies very quickly with frequency, so it will only radiate over a small bandwidth.

To understand at a deeper level, read the website.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group