JPH0125241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a diversity type antenna device that is effective for use in portable small wireless transceivers and the like.

BACKGROUND TECHNOLOGY In general, when trying to improve the transmission and reception characteristics of a small portable wireless transceiver, etc., it is desirable to use a diversity type antenna device, but all conventionally known diversity type antenna devices include rod antennas etc. When installed in a wireless transmitter/receiver, etc., it would protrude considerably larger than its housing.

Problems to be Solved by the Invention Therefore, the conventional antenna devices of this type are extremely inconvenient, especially when carried, and have the problem that the entire device is quite bulky.

The present invention eliminates the above-mentioned conventional drawbacks, and provides an excellent diversity type antenna that has a simple structure and can be installed in the housing of a wireless transmitter/receiver etc. without protruding itself. The purpose is to provide a device.

Means for Solving the Problems In order to achieve the above object, the present invention arranges first and second conductor plates electrically connected to each other so as to face each other with a first dielectric interposed therebetween. , second
A loop-shaped cut groove is formed in the center of the conductor plate, and the center conductor plate and the first conductor plate are separated by the cut groove.
A flat slot antenna is formed by the dielectric and the first and second conductor plates, and a second dielectric separately provided on the outer surface of the second conductor plate constituting the slot antenna. A loop-shaped conductor layer is provided through the body, a loop antenna is formed by this conductor layer, and both antennas are configured to form a diversity type antenna device.

Therefore, according to the present invention, the diversity type antenna device can be formed into a flat plate shape as a whole, and even when attached to the housing of a wireless transmitter/receiver, etc., it can be easily attached without protruding much. If used as part of the casing, it can be easily installed without having to extend it at all, and without increasing the size of the casing itself.

Embodiment FIG. 1 is a partially cutaway perspective view of an embodiment of the antenna device of the present invention. In Figure 1, 2
is a first conductive plate, which is arranged so as to face the second conductive plate 4 with the first dielectric 3 interposed therebetween. Reference numeral 5 denotes a second dielectric placed on the top surface of the second conductive plate 4. A loop-shaped conductive layer 6 is provided on the top surface of the dielectric 5, and the loop antenna is formed by this conductive layer 6. It is formed. Reference numeral 7 denotes a loop-shaped cut groove formed in the center of the second conductor plate 4, and the center part is separated from the second conductor plate 4 by this cut groove 7. A flat slot antenna is formed between the central conductor plate and the first and second conductor plates 2 and 4. 8
are short-circuit wires provided at each of the four corners of the first dielectric 3, and are for electrically connecting the first and second conductor plates 2 and 4 to each other. Reference numeral 9 denotes a feed line that feeds power to the central conductor plate constituting the slot antenna, and 10 a feed line that feeds power to the conductor layer that constitutes the loop antenna.

FIG. 2 shows the electric fields created by both the loop antenna and the slot antenna shown in FIG. 1 when power is supplied to both antennas. Second
In the figure, reference numeral 11 indicates an electric field generated by the slot antenna, and reference numeral 12 indicates an electric field generated by the loop antenna. The electric field 11 created by the slot antenna and the electric field 12 created by the loop antenna 12 are orthogonal to each other, and therefore, they operate independently without interfering with each other. That is, Fig. 1,
In the state shown in FIG. 2, if a radio wave now arrives from the side, if the radio wave is horizontally polarized, it will be received by the loop antenna, and if it is vertically polarized, it will be received by the slot antenna. Therefore, if the antenna device and the direction in which radio waves arrive change, an input difference will inevitably occur due to a difference in polarization. Therefore, by using this input difference to switch between the two antennas, a polarization diversity type antenna device can be easily obtained.

In the above embodiment, the first and second conductor plates 2 and 4
They were configured to be electrically connected to each other by short-circuit wires 8 provided at the four corners of the first dielectric 3. 1. It goes without saying that the second conductor plates 2 and 4 may be electrically connected to constitute a cavity resonator.

As described above, according to the above embodiment, the first and second conductor plates 2 and 4 facing each other and the conductor plates 2,
A flat slot antenna is formed as a whole by the dielectric 3 interposed between the two conductor plates 4, the central conductor plate separated from the second conductor plate 4 by a loop-shaped cut groove, and the like. A loop-shaped conductor layer 6 is provided on the upper surface of the second conductor plate 4 constituting the antenna via a second dielectric 5, and a loop antenna is formed by this conductor layer 6. It can be easily made into a diversity type antenna device using an antenna, and it can be configured as a flat plate as a whole, so even when attached to a wireless transmitter/receiver etc., it can be easily attached without protruding beyond the housing. It has the advantage of being able to

3 and 4 are respectively perspective views of the antenna device of the present invention attached to the housing of a wireless transmitter/receiver, etc., and FIG. The figure shows the case where it is attached to the top and bottom surfaces of the housing, respectively. In either case, the first conductor plate 2 is attached so as to be in contact with the top or bottom surface of the housing 1, but the size of the entire antenna device is substantially the same as the top or bottom surface of the housing 1. Since the antenna device itself does not appear to extend substantially beyond the housing 1, there is no problem in handling it. In particular, in the example shown in FIG. 4, the antenna device of the present invention is attached to the upper and lower surfaces of the housing 1, and each antenna device is likely to be coupled to each other. However, according to the antenna device of the present invention, the first They can be separated from each other by the conductor plates 2, and mutual coupling can be significantly reduced. Therefore, each antenna device can be operated independently as a diversity type antenna device, and sensitivity characteristics can be further improved.

Effects of the Invention As is clear from the above embodiments, the present invention has the following advantages:
A slot antenna is constituted by a second conductor plate, a dielectric material interposed between the conductor plates, and a central conductor plate separated from the second conductor plate. A loop-shaped conductor layer is formed on a conductor plate through a second dielectric material and used as a loop antenna, and if the structure is configured to switch between both antennas, it can be easily diversified. It can be a city-type antenna device, and has a flat plate shape as a whole, so even when attached to the housing of a wireless transmitter/receiver, etc.
It has the advantage that it does not extend beyond the casing at all.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of one embodiment of the antenna device of the present invention, FIG. 2 is a diagram showing the electric field when power is supplied to each antenna constituting the same embodiment, and FIGS. 3 and 4 are FIG. 3 is a perspective view of the antenna device of the present invention attached to a housing of a wireless transmitter/receiver or the like. 1... Housing, 2, 4... First and second conductor plates,
3, 5... First and second dielectrics, 6... Loop-shaped conductor layer, 7... Cut groove, 8... Short circuit line, 9, 10...
...Power line.

Claims (1)

[Claims] 1. First and second conductor plates electrically connected to each other at the outer periphery are arranged to face each other via the first dielectric, and a loop-shaped conductor plate is installed in the center of the second conductor plate. By forming a cut and feeding power between the central conductor plate and the first conductor plate separated by the cut groove, the central conductor plate and the first and second conductor plates form a flat slot antenna. A loop is provided on the surface of the second conductive plate constituting the slot antenna, which is concentric with the groove and parallel to the central conductive plate, via a second dielectric. An antenna device comprising a conductor layer formed in the shape of a shape, and configured such that the conductor layer functions as a loop antenna by supplying power to the conductor layer.