A biconical antenna consists of an arrangement of two conicalconductors, which is driven by potential, charge, or a alternating magnetic field (and the associated alternating electric current) at the vertex. The conductors have a common axis and vertex. The two cones face in opposite directions. Biconical antennas are broadband dipole antennas transceiving signals from 30 MHz to 300 MHz.
If one of the cone's angle at the vertex is 180 degrees (or if one of the cones is reduced to a plane), it is called a discone.
A simple conical monopole antenna is a wire approximation of the solid biconical antenna and has increased bandwidth (over a simple monopole). A bowtie antenna is simple broadband wire approximation of a biconical antenna (commonly used for UHF transception).
However, to reduce test time, broadband antennas such as the biconicalantenna and log periodic antennas began to be accepted.
Broadband antennas, compared to half wave dipoles, reduce test time because the technician did not have to stop the test to adjust the dipole antenna for each frequency.
For rapid deployment along with the mobility of a small package, the folding Biconical elements can be closed similar to an umbrella allowing the antenna to be contained in an optional transit storage case.
The structure of such biconicalantennas is disclosed in JP 2001-185942A and JP H9-8550A, for example.
[0010] However, as far as the size of the biconicalantenna is concerned, the length of the frustum-shaped lead line in the biconicalantenna disclosed in JP H9-8550A is 25 cm, which is too large to attach it to a notebook computer.
The biconicalantenna can be made lighter by making the feeder portion and the ground portion by forming a conductive film provided on the inner surface of the frustum-shaped cavities.
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