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Multi-frequency sharing array antenna

A technology for sharing antennas and antennas. It is applied to antenna arrays, antennas, and antenna arrays that are energized separately. It can solve the problems of radiation directivity distortion and antenna gain reduction in the front direction, so as to reduce the deterioration of radiation directivity and suppress excitation current. The occurrence of , the effect of suppressing the excitation current

Inactive Publication Date: 2002-05-08
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Also, to reduce the interference caused by the above-mentioned re-radiation to the radiation directivity of the dipole antenna operating at frequency f2, it is possible to arrange the dipole antenna operating at frequency f2 above the dipole antenna operating at frequency f1 However, since the height from the ground conductor is longer than 1 / 4 of the radio wave wavelength of f2, the gain in the front direction of the antenna is reduced, and a zero point is formed in a large-angle direction due to the reflection of the ground conductor, resulting in relatively poor radiation directivity. large distortion

Method used

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Embodiment 1

[0059] Figure 4 It is a top view showing the structure of the dual-frequency sharing antenna array according to Embodiment 1 of the present invention. Also, Figure 5 shows along Figure 4 Antenna array diagram seen on the vertical plane of line A-A. In the figure: 1 is a plane or curved ground conductor; 2 is a dipole antenna (wire antenna) composed of a dipole antenna unit (antenna unit part) that works with a relative frequency f1; 3 is the feeder of the dipole antenna 2 ; 4 is located on both sides of the feeder line 3, formed near the midpoint of the left and right dipole antenna units of the dipole antenna 2, forming a curved bend; 5 is a dipole antenna working at a frequency f2 higher than the frequency f1; 6 is the feeding line of the dipole antenna 5 .

[0060] Its working process is described below.

[0061] In the case of a common dipole antenna with two frequency bands in the same aperture, the dipole antenna working at a relatively low frequency f1 blocks the ...

Embodiment 2

[0073] Figure 12 It is a schematic structural diagram of a dipole antenna working at a relatively low frequency according to Embodiment 2 of the present invention. The same symbols as those in No. 6 denote the same or corresponding parts, so explanations are omitted. 11 is the gap at the feeding point of the dipole antenna; 12 is the starting point of the bellows 4; 13 is the end point of the bellows 4; 14 is a linear conductor that regards the dipole antenna as divided on a specific frequency. Compared with Embodiment 1, Embodiment 2 differs in that: the length of the bell curve set near the center of each dipole unit of the relatively low working frequency f1 of the dipole antenna is limited in this embodiment. In other words, in the present embodiment, the length of the crank is set to 1 / 4 of the wavelength of the radio wave of relatively higher frequency f2.

[0074] The operation process will be described below.

[0075] The situation of making the multi-frequency sha...

Embodiment 3

[0078] Figure 13 It is a schematic structural diagram of a dipole antenna working at a relatively low frequency according to Embodiment 3 of the present invention. The same symbols as those in No. 6 denote the same or corresponding parts, so explanations are omitted. The difference between Embodiment 3 and Embodiment 1 and Embodiment 2 is that the cranks on the left and right dipole units constituting the dipole antenna are not near the center but at any position. Also, the bellcrank formation position on the dipole subunit is determined by the distance L1 from the feeder line 3 to the bellcrank 4 and the distance L2 from the center of the bellcrank 4 to the end of the dipole unit.

[0079] The operation process will be described below.

[0080] Regarding the case of making the multi-frequency shared antenna array work at the relatively low frequency f1, it is the same as that of Embodiment 1, and the description is omitted. On the other hand, when operating at a relativel...

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Abstract

An array antenna comprising a plurality of regularly-arranged linear antennas belonging to groups of linear antennas operating at respective operating frequencies so as to share at least two frequencies, groups of linear antennas operating at respective operating frequencies being appropriately combined with each other, wherein a crank (4) is formed on an antenna element constituting a linear antenna (2) operating at a comparatively low frequency.

Description

technical field [0001] The invention relates to a multi-frequency sharing antenna array which is isolated from each other and shared by multiple frequency bands and used as a base station antenna in a mobile communication system. Background technique [0002] For example, with regard to antenna devices such as base station antennas installed to implement mobile communication systems, it is common practice to design antennas that meet the specifications for each operating frequency and install antennas at each installation location. Base station antennas can be installed on building roofs, iron towers, etc. to communicate with mobile stations. Recently, a large number of base stations have been randomly installed and built, multiple communication systems are mixed and used, and the scale of base stations has expanded, making it difficult to secure the location of base stations. In addition, it is necessary to reduce the number of base stations from the viewpoint of cost redu...

Claims

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Application Information

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IPC IPC(8): H01Q21/30H01Q5/10H01Q5/15H01Q5/364H01Q9/16H01Q9/26H01Q9/36H01Q21/06H01Q21/28
CPCH01Q21/062H01Q9/16H01Q9/36H01Q21/28H01Q9/26H01Q5/00H01Q5/0075H01Q21/061H01Q5/42
Inventor 西泽一史大岭裕幸西村俊雄片木孝至
Owner MITSUBISHI ELECTRIC CORP
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