Wide band antenna
View Patent ↗Disclosed is a wideband antenna with a lowered standing wave ratio. The wideband antenna interposes a substance whose conductivity is about 0.1 through 10.0 as an interposition between a reference conductor and a radiation conductor; and thereby, the antenna reduces reflections of signals, and achieves a wider bandwidth as well as a sufficient gain with a lowered standing wave ratio. Also, the invention realizes a thin-type wideband antenna with a wider bandwidth and a sufficient gain, by interposing a magnetic substance whose relative permeability is more than 1 through about 8 as the interposition between the reference conductor and the radiation conductor.
1. A wideband antenna, comprising:
a reference conductor;
a radiation conductor, at least parts of the reference conductor and the radiation conductor being disposed so as to face each other;
a substance whose conductivity is about 0.1 [/Ωm] through 10 [/Ωm] in the operational radio frequency being interposed between the reference conductor and the radiation conductor of the wideband antenna;
a feed connected to at least the radiation conductor to transmit power thereto;
a capacitor having a capacitance in the range of 0.5–1.5 pF that is electrically connected in series or parallel to the feed; and
a short-circuiting pin electrically connected to the center of the radiation conductor and the center of the reference conductor.
2. The antenna of claim 1 , wherein
the radiation conductor is in the form of a substantially flat plate, and is disposed in close proximity to and substantially in parallel to the reference conductor.
3. The antenna of claim 1 , wherein
the substance interposed between the reference conductor and the radiation conductor has a relative dielectric constant of ≦10.
4. The antenna of claim 1 , further comprising:
a ground feeding point in contact with the reference conductor.