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Method of producing helical antenna and helical antenna apparatus

A helical and antenna technology, applied to helical antennas, devices that enable antennas to work in different bands at the same time, antennas, etc., can solve the problems of high price, complex structure, difficult arrangement, etc., and achieve the effect of easy production

Inactive Publication Date: 2003-12-03
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] Therefore, since this feeder circuit can only be mounted on a printed circuit board planarly, there are problems in the conventional helical antenna that the printed circuit board feeder circuit part is large in size, complicated in structure and expensive.
[0031] In addition, it is very difficult to arrange eight terminals for tightly connecting the conductive wires of the helical antenna and the separation / combination circuit respectively on the support of the helical antenna.

Method used

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  • Method of producing helical antenna and helical antenna apparatus
  • Method of producing helical antenna and helical antenna apparatus
  • Method of producing helical antenna and helical antenna apparatus

Examples

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Embodiment Construction

[0059] Refer below Figures 1 to 13 The helical antenna and its production method according to the present invention will be specifically described.

[0060] figure 1 is an exploded perspective view of a helical antenna according to one embodiment of the present invention, figure 2 It is a structural diagram of an antenna in a planar state and a feeder circuit connected to the antenna according to an embodiment of the present invention.

[0061] exist figure 1 and figure 2 The helical antenna 40 is provided with an antenna body 50 capable of covering the two frequency bands of the first frequency band F1 (1.985 to 2.015 GHz) and the second frequency band F2 (2.17 to 2.2 GHz), and the feeder shared by the antenna body 50 Circuit 60.

[0062] Such as figure 1 and figure 2 As shown, the antenna body 50 is provided with a cylinder 502 with a diameter of about 8% of the wavelength of the first frequency band F1 or the second frequency band F2 and a specific length, and...

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Abstract

The invention provides a helical antenna capable of covering a plurality of frequency bands and using commonly a feeder system for antenna elements adjusted to the respective frequency bands. First and second antenna elements adjusted in length to wavelengths of the frequency bands to be used are arranged helically at a specified pitch angle with a spacing between each other in the circumferential direction of a cylindrical body on the surface of a dielectric sheet wound around the outer circumferential surface of said cylindrical body. Coupling lines to be electromagnetically coupled to one-side ends of the antenna elements being adjacent to one another are formed on the surface of the dielectric sheet. Signal is fed from a common feeder circuit through the coupling lines to the respective antenna elements.

Description

technical field [0001] The present invention relates to a helical antenna for use as an antenna of a mobile terminal in a mobile radio communication system for a mobile satellite or the like, and a method for producing such a helical antenna. Background technique [0002] Generally, a mobile communication system using a mobile artificial satellite uses a frequency band of 1.985 to 2.015 GHz as a transmission frequency band, and uses a frequency band of 2.17 to 2.2 GHz as a reception frequency band. [0003] Therefore, in transmission and reception between a mobile artificial satellite and a mobile station, an antenna having frequency characteristics capable of efficiently performing transmission and reception and having low return loss in a frequency band of about 30 MHz is required. [0004] In addition, an antenna with a small size and a light weight is required as an antenna for a mobile terminal. [0005] Therefore, a helical antenna is used, but if the axial length and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/38H01Q5/00H01Q5/40H01Q11/08
CPCH01Q5/0072H01Q1/38H01Q11/08H01Q5/40
Inventor 田边浩介
Owner NEC CORP