Ultrawide Band Antenna and Filter Design
Ultrawide Band Antenna and Filter Design
Ultrawide Band Antenna and Filter Design
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Variety <strong>and</strong> principle of basic antenna<br />
Distribution<br />
of voltage<br />
Distribution<br />
of electric<br />
current<br />
15<br />
r<br />
λ/4<br />
(97mm@3.1GHz)<br />
monopole antenna<br />
If it’s bigger than 1λ, it gets close to infinity characteristics.<br />
It is finite actually.<br />
Ground plane<br />
(infinite size)<br />
It becomes antenna when ground plane<br />
exists.<br />
Ground plane is also one of the important part of antenna.<br />
λ/4<br />
If it’s smaller than 1λ,<br />
especially less than λ/4,<br />
characteristics changes drastically.<br />
advantage→It has simple structure that just<br />
set up the λ/4 element on the<br />
ground.<br />
disadvantage→The efficiency depends on configuration<br />
of ground. It is not for low profile<br />
because it needs to set up element for<br />
defrag I/O impedance.<br />
2005/11/3
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