US 5,969,690 AGranted

Mobile radio antenna

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsMasaaki Yamabayashi, Koichi Ogawa, Naoki Yuda

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Abstract

Although conventional antennas have characteristics suitable for mobile radio base stations, their vertical dimension is large, and locations of their installation are limited. A radiator for an first upper antenna 32 is arranged in a hollow nonconductive radome 2, using an internal conductor 7a and a metal pipe 10. A radiator for a second lower antenna 34 is arranged in the radome 2, using metal pipes 14 and 15. Two parasitic elements 31 are installed substantially in parallel with the first antenna 32 below a feeding point 9. Two parasitic elements 33 are installed substantially in parallel with the second antenna 34 above a feeding point 13. These allow the tilt angle to be freely set between -10.degree. and +10.degree. by adjusting the parasitic element length and the antenna to be reduced in size.

Claims26

Dependent claims

A mobile radio antenna comprising:

a vertical dipole antenna having a feeding point;
a plurality of passive elements;
and
supporting means which is insulating and supports said dipole antenna and said plurality of passive elements so that each of said plurality of passive elements is virtually parallel to said vertical dipole antenna and the center of each of said plurality of passive elements differs in height from said feeding point by a predetermined distance,
each of said plurality of passive elements being a line or strip conductor with an electrical length within .+-.10% of a wavelength used, and
wherein a plurality of combinations of said vertical dipole antenna, said plurality of passive elements, and said supporting means are each disposed vertically, such that the center of each of said plurality of passive elements, which are included in the top of said plurality of combinations, is said predetermined distance below said feeding point included in said top combination, and the center of each of said plurality of passive elements, which are included in the bottom of said plurality of combinations, is said predetermined distance above said feeding point included in said bottom combination.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/896,976Filed 18 Jul 1997
Priority: JP 8-18959818 Jul 1996
Granted: 19 Oct 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01Q 21/10
The units being spaced along or adjacent to a rectilinear path: collinear arrangements of substantially straight elongated conductive units
H01Q 1/246
Used in mobile communications, e.g. GSM: specially adapted for base stations
H01Q 3/2641
The auxiliary unit being composed of a plurality of antennas: being secundary elements, e.g. reactively steered
H01Q 5/40
Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements: imbricated or…