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 />
log-periodic dipole array antenna<br />
21<br />
L1<br />
α<br />
Feed line<br />
(feed with phase inversion)<br />
L2<br />
Approximately L1 decide minimum limit<br />
of resonance frequency. And L2 decide<br />
Guided wave area<br />
maximum limit of resonance frequency.<br />
Radiation area Example of design:α=10°、L1=63.5mm<br />
element number=15、L2=31.8mm<br />
Reflection area<br />
Each working area moves over<br />
by changing of frequency.<br />
b<strong>and</strong>width→1.1GHz~1.9GHz(less than VSWR2)<br />
gain →+8~+11dBi(Peak)<br />
2005/11/3
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