JPH09107238A - Compound antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the communication sensitivity in satellite communication as well as ground communication by arranging a plane antenna for circularly polarized wave and a plane antenna for linearly polarized wave between which an earth conductor plate is interposed and providing an antenna storage means turned by a radio machine head part. SOLUTION: A composite antenna consists of a micro strip line plane antenna 6 in the back feed system, an inverted F type antenna 5, an earth conductor 14 sharing the earth part of the plane antenna 6 and the inverted F type antenna 5, a helical antenna 9, and a half-wave antenna 17. It is stored in a storage means 18, and the storage means 18 is arranged on the upper end part of a portable telephone, and a support body to move it is provided. In the case of satellite communication, the antenna is moved so that the plane antenna 6 is turned to the zenith; and in the case of ground communication, it is so moved that the inverted F type antenna 5 is placed at the rear of the portable telephone. Since the composite antenna is arranged in this manner, the communication sensitivity is secured in satellite communication as well as ground communication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION As shown in FIGS. 6 (a) and 6 (b),
The present invention relates to the arrangement of antennas effective for both mobile communication systems that perform satellite communication 34 with satellites 32 using a portable radio 20 and mobile communication systems that perform terrestrial communication 35 with a base station 33 on the ground. It is a thing.

[0002]

2. Description of the Related Art Currently, in mobile communications such as a portable radio (20) (hereinafter referred to as a mobile phone), 800 MHz
Linearly polarized waves in the band, the 1.5 GHz band and the 1.9 GHz band are used. In recent years, mobile phones using satellites (32) (2
0) concept is proposed by each company, and those frequency bands are 1.6 GHz band from the terrestrial mobile phone (20) to the satellite (32) and those from the satellite (32) to the terrestrial mobile phone (20). To which 2.4 GHz band is allocated,
The 1.6 GHz band is from the ground to satellite (32) and satellite (3
There is one assigned from 2) as a frequency band used for two-way communication on the ground. As an antenna configuration, for example, the one shown in FIG. 7 has a transmitting microstripline planar antenna 22 (hereinafter, transmitting planar antenna) and a receiving microstripline planar antenna 23 (hereinafter, receiving plane) for satellite communication (34). The antenna is used to switch to the linear antenna 21 for linearly polarized wave for the ground base station (33) (ITU research: Non-stationary satellite communication system in the world, No. 261/262, New Japan ITU Association). Published in August 1993 P.36) is proposed.

The prior art will be described below with reference to FIG. Here, for the sake of explanation, the description will be given along with the configuration of the linear antenna 21 and the planar antennas 22 and 23 proposed by the Odyssey System (TRW, USA) published in the above-mentioned ITU research. This antenna system includes a linear antenna 21.
With a folding antenna array 24 that integrally includes a transmitting plane antenna 22 and a receiving plane antenna 23, the folding antenna array 24 is rotated around the head of the mobile phone 20 toward the back side and fixed at an arbitrary angle that improves sensitivity. it can. The linear antenna is used for ground communication (35) at frequency f2. The transmitting plane antenna 22 and the receiving plane antenna 23 have frequencies f1 and f1, respectively.
Satellite communication (34) with the satellite (32) is performed using f3. In the case of a satellite communication system having the same frequency f1 in the transmission / reception band, one of the planar antennas may be used for both transmission and reception.

[0004]

However, the folding antenna array 24 does not take into consideration the communication sensitivity in the folded state or the ground communication, and the communication sensitivity in the folded state or the antenna operating during the ground communication. There is only one, which causes deterioration of communication sensitivity.

[0005]

In order to solve the above problems, the present invention provides a circularly polarized plane antenna, a linearly polarized plane antenna, and a ground conductor plate in which the two plane antennas share a ground portion. An antenna accommodating means for arranging both plane antennas with the ground conductor plate sandwiched therebetween and rotating by the head of the radio device is provided.

[0006]

1 to 6 show an embodiment of the present invention. In the drawings, the same parts are denoted by the same reference numerals. In FIG. 1, 5 is an inverted F-shaped antenna (planar antenna means for linearly polarized wave), 6 is a back feeding type microstrip line planar antenna (planar antenna means for circularly polarized wave), 9 is a helical antenna, and 17 is A half-wave antenna, 18 is a storage means for the composite antenna.

In the embodiment of the present invention, as shown in FIG. 1, a rear surface provided with a patch-shaped conductor 2 on one surface of a dielectric substrate 3, a ground conductor plate 4 on the other surface, and at least one power supply pin 1. The feeding microstrip line planar antenna 6 (hereinafter, planar antenna), the inverted F-shaped antenna 5, the ground conductor 14 that shares the ground portion of the planar antenna 6 and the inverted F-shaped antenna 5, and the dielectric cylinder 7. Wound spiral conductor wire 8
And an extendable half-wave antenna 17 adapted to be capacitively coupled to the helical antenna 9 when extracted and substantially decoupled therefrom when retracted. Configure a composite antenna. Further, as shown in FIG. 2, the housing means 1 for this composite antenna
The antenna device which is rotated by the head of the mobile phone 20 is configured by combining with the support 19 of the composite antenna that rotates 8.

[0008] Here, the operation of each element will be described, and further, their arrangement as a composite antenna and finally the operation as a composite antenna device will be described.

First, the planar antenna 6 is shown in FIG.
A case where the antenna operates as a circularly polarized wave antenna used in the satellite communication 34 shown in FIG. As shown in FIG. 4, the planar antenna 6 includes a dielectric substrate 3, a patch-shaped conductor 2, a ground conductor plate 4 on the other surface, and a through hole 15 for a feed pin. By appropriately designing the dielectric constant, the size of the patch-shaped conductor 2 to be attached to the substrate 3, the position of the through hole 15 for the feed pin, and the like, the antenna operates as a circularly polarized wave antenna. The ground conductor plate 4 provided on the other surface has a diameter larger than that of the through hole 15. When the feed pin 1 is provided in the through hole 15, the ground conductor plate 4 is connected to the patch-shaped conductor 2, and the ground conductor plate 4 is not connected to the ground conductor plate 4. It is contact. For example, when a square patch antenna is provided on the plane antenna 6 as shown in the figure, the plane antenna 6 is a one-point feeding type patch antenna according to the frequency band used, and the long side and the short side are A and B, respectively. Then 100
× A / B = 102 to 103%. The through holes 15 for the power feeding pins are arranged on the diagonal line of the rectangular patch-shaped conductor 2. At this time, the long side A resonates at a low frequency and exhibits a linear polarization characteristic, and the short side B resonates at a high frequency and exhibits a linear polarization characteristic crossing the elliptical polarization. Operates as a circularly polarized antenna at frequencies in between.

Further, as shown in FIG. 4 (b), the through holes 15 for the power supply pins are formed on the diagonal line of the quadrangle at 100 × (ab) /
It is known that if the arrangement is such that a = 30%, a 50Ω impedance matching can be achieved and a characteristic impedance 50Ω impedance matching can be achieved. Further, the bandwidth is set by the thickness of the dielectric substrate 3 or the like.

Next, one side of the ground conductor plate 4 of the planar antenna 6 and one side of the ground conductor 14 are electrically connected, and the other side of the ground conductor 14 is provided with the diversity of the ground communication 35 shown in FIG. 6 (a). The inverted F-shaped antenna 5 (see FIG. 5) to be used is electrically connected.

Next, the helical antenna 9 has a conductor wire wound around the dielectric cylinder 7, and operates at the frequency f2 in the terrestrial communication 35 to be used in a state in which the half-wave antenna 17 is housed and in an extended state. , The number of turns of the helical antenna and the diameter of the dielectric cylinder 7 are set appropriately.

Further, the half-wavelength antenna 17 which operates in the same frequency band as the helical antenna 9 can be stored and extended through the substantial center of the helical antenna 9 and is capacitively coupled to the helical antenna 9 when it is pulled out and decoupled when it is stored. As described above, the conductor wire has a diameter equal to or smaller than the diameter of the linear conductor wire or the helical antenna 9 or a helical antenna having a small diameter winding.

The above four antenna groups are accommodated in one accommodating means 18, the accommodating means 18 is arranged at the upper end of the portable telephone 20, and a support 19 for movably is provided. As described above, when performing satellite communication 34, the plane antenna 6 is directed toward the zenith, and when performing ground communication 35, the inverted F-shaped antenna 5 is moved so as to be on the back surface of the mobile phone 20. By arranging the composite antenna in this way, it is possible to secure communication sensitivity in both satellite communication 34 and ground communication 35.

In the embodiment of the present invention, four antenna groups are housed in one housing means 18. However, two housing means are provided, the flat antenna 6 and the inverted F-shaped antenna 5 are housed in one, and the helical antenna is housed in the other. There is no problem even if the antenna 9 and the half-wave antenna 17 are provided and both the storage means or only the storage means side of the planar antenna 6 are moved appropriately.

An operating condition in the embodiment of the present invention will be described with reference to FIG.

In FIG. 3, 27 is a first switching means used for terrestrial communication diversity, 28 is a second switching means used for switching between terrestrial communication and satellite communication, and D is a half-wavelength antenna 17 and a helical antenna 9. The two antennas are capacitively coupled at a distance D when the half-wave antenna 17 is extended, and decoupled when housed. Dotted lines are coaxial lines for connecting each antenna and the main body of the mobile phone 20. Further, as shown in FIGS. 6A and 6B, f1 is the frequency of satellite communication 34, and f2 is the frequency of ground communication. Planar antenna 6 and inverted F-shaped antenna 5
Are separated by a ground conductor 14.

[0018]

As described above, according to the present invention, transmission is performed using a small portable radio device such as the mobile phone 20,
It is possible to maintain the communication sensitivity of reception regardless of the satellite communication 34 or the ground communication 35.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention when (a) a half-wavelength antenna is extended and (b) when a half-wavelength antenna is housed.

2A and 2B are perspective views of a mobile phone equipped with a composite antenna device according to an embodiment of the present invention, in which FIG. 2A is a perspective view during ground communication and FIG. 2B is a perspective view during satellite communication.

3A and 3B are diagrams illustrating operation switching according to the embodiment of the present invention, in which FIG. 3A is a perspective view and FIG.

FIG. 4 is an explanatory diagram of a microstrip line planar antenna.

FIG. 5 is an explanatory diagram of an inverted F-shaped antenna.

FIG. 6 is an explanatory diagram of mobile communication.

FIG. 7 is a perspective view of a conventional mobile phone.

[Explanation of symbols]

1: Feeding pin 2: Patch-shaped conductor 3: Dielectric (dielectric substrate) 4: Ground conductor plate 5: Inverted F-shaped antenna (planar antenna means for linear polarization) 6: Microstrip line planar antenna (circle) Planar antenna means for polarization) 7: Dielectric cylinder 8: Spiral conductor wire 9: Helical antenna 10: Feed point of inverted F-shaped antenna 11: Feed point of helical antenna 12: Feed point of planar antenna 13: Half Wavelength antenna conductor wire 14: Ground conductor 15: Through hole for feed pin of planar antenna 16: Half-wave antenna protective dielectric 17: Half-wave antenna 18: Composite antenna storage means 19: Composite antenna support means 20: Portable radio device (cellular phone) 21: Linear antenna 22: Microstrip plane antenna for transmission (planar antenna for transmission) 23: Microstrip for reception Plane antenna (planar antenna for reception) 24: Folding antenna array 27: First switching means 28: Second switching means 32: Satellite 33: Ground base station 34: Satellite communication 35: Ground communication

Claims (2)

[Claims] 1. A radio antenna comprising a plane antenna for circular polarization, a plane antenna for linear polarization, a ground conductor plate in which the two plane antennas share a ground portion, and both plane antennas with the ground conductor plate sandwiched therebetween. A composite antenna device, comprising: an antenna housing means that rotates by a machine head. 2. The antenna accommodating means or a separate antenna from the antenna accommodating means, which is capacitively coupled to the helical antenna when pulled out, and is substantially coupled to the helical antenna when the antenna is pulled out. A linearly polarized telescopic antenna, which is composed of an expandable half-wave antenna adapted to be released, is arranged, and the circularly polarized planar antenna has an operating frequency of f1 and the linearly polarized planar antenna. The telescopic antenna has an operating frequency of f2, and has at least two switching means for switching to the plane antenna for circular polarization during satellite communication and for switching between the plane antenna for linear polarization and the telescopic antenna during ground communication. The composite antenna device according to claim 1, further comprising: