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 ultra wide b<strong>and</strong> antenna<br />
spiral antenna (circular polarization antenna)<br />
23<br />
Archimedean spiral antenna Conical spiral antenna Quad line conical spiral antenna<br />
Electric wave radiate vertical<br />
direction to spiral plane.<br />
Input impedance 150~170Ω<br />
Stable frequency<br />
Axial direction<br />
excitation<br />
Side<br />
directional<br />
excitation<br />
can change direction to axial or side<br />
by the way of excitation of 4 lines.<br />
advantage: stable characteristics for wide b<strong>and</strong>width as circular polarization antenna<br />
disadvantage: need feeder circuit (ultra wide b<strong>and</strong> balun) for antenna structure<br />
2005/11/3
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