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sflee
Antenna-Theory.com Newbie
Joined: 10 Feb 2011
Posts: 1
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 Posted: Thu Feb 10, 2011 12:14 pm Post subject: why we can only use limited bandwith? |
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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. |
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Schubert
Antenna Wizard
Joined: 08 Apr 2009
Posts: 161
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| Posted: Thu Feb 10, 2011 7:01 pm Post subject: |
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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. |
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