Helical double-resonance antenna capable of suppressing fluctuation of electric characteristics and without limit of size of helical coil

A technology of helical coil and helical antenna, applied in resonant antennas, helical antennas, non-resonant long antennas, etc., can solve the problems of helical coil interference, limitation, and hindering the reduction of antennas.

Inactive Publication Date: 2004-01-21
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This hinders the reduction of the overall size of the antenna, because the size of the helical coil (especially the size of the inner helical coil) is limited by the above-mentioned structure
[0007] Third, since the double helical coils overlap each other, the electrical characteristics of the helical coils interfere with each other
Therefore, the size of the helical coil is limited, allowing only a small degree of freedom
In addition, the reduction of the overall size of the antenna is limited
Also, helical coils interfere with each other, so changing the shape of the coils can cause wide fluctuations in electrical characteristics
Therefore, the dual resonant helical antenna has many disadvantages in structure

Method used

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  • Helical double-resonance antenna capable of suppressing fluctuation of electric characteristics and without limit of size of helical coil
  • Helical double-resonance antenna capable of suppressing fluctuation of electric characteristics and without limit of size of helical coil
  • Helical double-resonance antenna capable of suppressing fluctuation of electric characteristics and without limit of size of helical coil

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Embodiment Construction

[0020] In order to facilitate the understanding of the present invention, the prior art dual-resonant helical antenna must first be explained.

[0021] 1A and 1B, the prior art dual-resonant helical antenna includes a conductive bracket 7 connected to a mobile terminal device (not shown) and having a threaded portion as a power feeding portion, which is made of conductive material and has different characteristics from each other. A pair of spiral coils 11 and 12 with inner diameters, and a pair of non-conductive guide rods 8 and 9 made of insulating material and having different inner diameters from each other. The spiral coils 11 and 12 have relatively small and relatively large inner diameters, respectively, and are also referred to as small spiral coils and large spiral coils. Similarly, the non-conductive guide rods 8 and 9 with smaller and larger inner diameters are referred to as the small guide rod 8 and the large guide rod 9, respectively. The spiral coils 11 and 12 are c...

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Abstract

In a two-resonance helical antenna, a single helical coil (3) is made of a conductive material and extends in one axis direction. An annular conductor portion (5) is arranged around the helical coil in a coaxial fashion to be spaced and insulated from the helical coil. The annular conductor portion is positioned in a middle portion of the helical coil in the one axis direction.

Description

Technical field [0001] The present invention generally relates to a helical antenna installed on a mobile terminal device of mobile communication, in particular to a dual-resonance helical antenna. Background technique [0002] This type of dual-resonant helical antenna includes a conductive bracket having a threaded portion serving as a feeding portion, a pair of spiral coils made of conductive material and having different aperture sizes or inner diameters from each other, and insulating materials A pair of non-conductive guide rods that are made and have different inner diameters from each other. The spiral coils have relatively small and relatively large inner diameters, and are also called small spiral coils and large spiral coils. Similarly, the non-conductive guide rods with smaller and larger inner diameters are called small guide rods and large guide rods, respectively. The spiral coils are respectively connected to the conductive support through non-conductive guide rod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q11/08H01Q1/24H01Q1/36H01Q5/10H01Q5/378H01Q9/27
CPCH01Q5/0062H01Q5/378H01Q1/36H01Q11/08H01Q1/242H01Q1/362H01Q9/27H01Q5/10
Inventor 浜荒津严
Owner TOKIN CORP
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