JP3410358B2 - Antenna device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device that can be used in an indoor wireless communication system or the like, and more particularly to an antenna device that can switch directional characteristics.

[0002]

2. Description of the Related Art The technology of an antenna device used in a wireless LAN (Local Area Network) system is described in, for example, the document "Y.
J.Guo, A.Paez, RASadeghzadeh, and SKBarton, "A
PatchAntenna for HlPERLAN, "Wireless Personal Commu
nications 3: pp.389-396, 1996. ".

This antenna device is a microstrip antenna composed of a dielectric substrate, a circular patch formed on the front surface of the dielectric substrate, and a ground plate formed on the back surface. This antenna device is
Use TM02 mode. Further, this antenna device has the directional characteristics as shown in FIG. 7 with respect to the inclination with respect to the direction of the axis perpendicular to the plane of the antenna device, and the directional characteristic of the horizontal plane parallel to the plane of the antenna becomes omnidirectional. That is, an annular beam is formed in the direction perpendicular to the plane of the antenna device.

The contents of FIG. 7 are described in the document "YJ Guo, A. Pae.
z, RASadeghzadeh, and SKBarton, "A Curcular Pat
ch Antenna for Radio LAN's, "IEEE Trans.Antenna Pro
pagat., vol.45, pp.177-178, Jan., 1997. ".

[0005]

A relatively wide communicable range can be obtained by constructing a wireless communication system using the antenna device that forms the above annular beam. However, there is a problem in that it is difficult to adjust the main radiation direction of the circular beam on the vertical plane and the desired beam shape.

In actual communication, there is a problem that communication cannot be performed if the main radiation direction of the beam of the antenna device deviates from the direction of the communication partner. For example, when the base station is installed on the ceiling indoors and the terminal station is installed on the floor or on the desk, if an antenna device that forms an annular beam is used for either the base station or the terminal station, it is directly under the base station. At the terminal station located at, the beam direction does not match, so it cannot communicate with the base station.

That is, it is not possible to communicate with a radio station located in front of an extension of an axis perpendicular to the plane of the antenna, and the radio station of the communication partner is arranged in a direction slightly inclined with respect to the axis perpendicular to the plane of the antenna. If you don't, you can't communicate. The main object of the present invention is to widen the communicable range and to switch the beam direction in the antenna device to reduce the dead zone formed in the front direction of the antenna or the like.

[0008]

According to another aspect of the present invention, there is provided an antenna device, wherein a first element antenna, a second element antenna, a third element antenna and a fourth element antenna are arranged in a clockwise or counterclockwise direction on a predetermined circumference. The antenna array, the first 90-degree phase shifter, the second 90-degree phase shifter, the third 90-degree phase shifter, the first input terminal, and the first input terminal Two input terminals, a first output terminal and a second output terminal, the first output terminal is connected to the first element antenna, and the second output terminal is the first 90 degree phase shift. A first hybrid circuit connected to the third element antenna via a controller, a third input terminal, a fourth input terminal, and a third input terminal.
Output terminal and a fourth output terminal, the third output terminal is connected to the second element antenna, and the fourth output terminal is the fourth 90 degree phase shifter via the second 90 degree phase shifter. A second hybrid circuit connected to the element antenna, a power supply input terminal, a fifth output terminal and a sixth output terminal,
A first input terminal of the first hybrid circuit is connected to the fifth output terminal and the third 90
The third input terminal of the second hybrid circuit is connected through the phase shifter, and the sixth input terminal has the second input terminal of the first hybrid circuit and the fourth input terminal of the second hybrid circuit. And a switching means for selectively connecting the power feeding input terminal to the fifth output terminal and the sixth output terminal.

Description will be made assuming that this antenna device is used as a transmission antenna. When the switching means is in the first selection state, the power applied to the power supply input terminal is
It is applied to the first input terminal of the first hybrid circuit and the third input terminal of the second hybrid circuit via the fifth output terminal. The phase of the power applied to the third input terminal is changed by 90 degrees by the third 90 degree phase shifter.

The electric power appearing at the first output terminal of the first hybrid circuit is fed to the first element antenna, and the electric power appearing at the second output terminal of the first hybrid circuit passes through the first 90 degree phase shifter. Power is supplied to the third element antenna via the.
On the other hand, the power appearing at the third output terminal of the second hybrid circuit is fed to the second element antenna, and the power appearing at the fourth output terminal of the second hybrid circuit is passed through the second 90-degree phase shifter. Power is supplied to the fourth element antenna.

In this case, the phase of the electric power fed to the first element antenna is the same as the phase of the electric power of the feed input terminal. Further, the phase of the electric power fed to the second element antenna is shifted by 90 degrees from the phase of the electric power of the feeding input terminal due to the influence of the third 90-degree phase shifter. Furthermore, the phase of the electric power fed to the third element antenna is shifted by 180 degrees from the phase of the electric power of the feeding input terminal due to the phase change in the first hybrid circuit and the influence of the first 90-degree phase shifter. Also,
Due to the influence of the third 90-degree phase shifter, the phase change in the second hybrid circuit, and the influence of the second 90-degree phase shifter, the phase of the power fed to the fourth element antenna is the power of the feed input terminal. It is 270 degrees out of phase.

That is, when the switching means is in the first selected state, the first element antenna, the second element antenna, and the third element antenna
The element antenna and the fourth element antenna are fed with a phase shift difference of 90 degrees from each other. On the other hand, when the switching means is in the second selected state, the electric power applied to the power supply input terminal is supplied to the second input terminal and the second input terminal of the first hybrid circuit via the sixth output terminal. Fourth of the hybrid circuit
Applied to the input terminal of.

Then, the electric power 90 degrees out of phase in the first hybrid circuit is supplied to the first element antenna from the first output terminal. In addition, power in phase with the second input terminal is transferred to the third output from the second output terminal through the first 90-degree phase shifter.
Power is supplied to the element antenna. Furthermore, the electric power 90 degrees out of phase in the second hybrid circuit is fed from the third output terminal to the second element antenna. In addition, when the power having the same phase as the fourth input terminal is fed from the fourth output terminal to the fourth element antenna via the second 90-degree phase shifter, the switching means is in the second selected state. , The first element antenna, the second element antenna, the third element antenna, and the fourth element antenna are fed with in-phase power.

When the phase of the electric power supplied to the first element antenna, the second element antenna, the third element antenna and the fourth element antenna is switched by switching the selection state of the switching means,
The directional characteristics of this antenna device are switched. By this switching, it is possible to switch between the directional characteristic having the annular beam and the directional characteristic in which the main beam is arranged in the center.

When wireless communication is performed using this antenna device, the communicable range can be expanded by switching the beam of the directional characteristics of the antenna. Claim 2
The antenna device according to claim 1, wherein a fifth output terminal of the switching means is connected to a first input terminal of the first hybrid circuit and one end of the third 90-degree phase shifter. And a second distributor that connects the sixth output terminal of the switching means to the second input terminal of the first hybrid circuit and the fourth input terminal of the second hybrid circuit. It is characterized in that it is further provided.

When the switching means is in the first selected state, the power applied to the power supply input terminal appears at the fifth output terminal and is further distributed to the two systems by the first distributor. It is supplied to the first input terminal of the first hybrid circuit and one end of the third 90-degree phase shifter. When the switching means is in the second selection state, the power applied to the power supply input terminal appears at the sixth output terminal,
Further, it is divided into two systems by the second distributor and supplied to the second input terminal of the first hybrid circuit and the fourth input terminal of the second hybrid circuit.

According to a third aspect of the present invention, in the antenna device according to the first aspect, the switching means comprises a double pole double throw switch having a fifth input terminal, and a terminating device is connected to the fifth input terminal. Characterize. Double pole double throw (DPDT: Do
When the uble Pole Double throw) switch is in the first selected state, the power applied to the feed input terminal appears at the fifth output terminal and the sixth output terminal appears at the fifth input terminal. It is terminated by the connected termination device.

When the double-pole double-throw switch is in the second selected state, the electric power applied to the power supply input terminal appears at the fifth output terminal and the fifth output terminal becomes the fifth output terminal.
Is terminated by a termination device connected to the input terminal of the.
A fourth aspect is the antenna device according to the first aspect, wherein the antenna array, the first 90-degree phase shifter, the second 90-degree phase shifter, the third 90-degree phase shifter, and the first hybrid circuit. , The second hybrid circuit and the switching means are configured as a planar circuit using a dielectric substrate and a conductive metal material adhered on the dielectric substrate.

The antenna array, the first 90-degree phase shifter, the second 90-degree phase shifter, the third 90-degree phase shifter, the first hybrid circuit, the second hybrid circuit and the switching means,
By forming all the circuits in a plane, the thickness of the antenna device is significantly reduced. According to a fifth aspect of the present invention, in the antenna device according to the fourth aspect, the first hybrid circuit and the second hybrid circuit are configured by a branch line type hybrid circuit or a rat race circuit.

When the branch line type hybrid circuit or the rat race circuit is adopted, the first hybrid circuit and the second hybrid circuit can be composed of a planar circuit.

[0021]

1 to 6 show the configuration and operation of an antenna device of this embodiment. This form corresponds to all the claims.

FIG. 1 is a perspective view showing the external appearance of the antenna device. FIG. 2 is a vertical cross-sectional view showing one element antenna included in the antenna device of FIG. FIG. 3 is a perspective view showing an actual arrangement example of the antenna device. 4 is shown in FIG.
3 is a block diagram showing a configuration of a power feeding circuit of the antenna device of FIG. FIG. 5 is a graph showing directional characteristics of the antenna device of FIG. FIG. 6 is a block diagram showing an arrangement example of each component of the antenna device of FIG.

According to this aspect, the antenna array according to claim 1, the first 90-degree phase shifter, the second 90-degree phase shifter, the third 90-degree phase shifter, the first hybrid circuit, and the second hybrid circuit are provided. The hybrid circuit and the switching means are respectively the antenna array 1
It corresponds to the 0,90 degree phase shifter 33, the 90 degree phase shifter 34, the 90 degree phase shifter 35, the 90 degree hybrid circuit 31, the 90 degree hybrid circuit 32 and the double pole double throw switch 38.

Further, the first element antenna and the second element antenna of claim 1
The element antenna, the third element antenna, and the fourth element antenna correspond to the element antennas 51, 52, 53, and 54, respectively. Further, the first input terminal, the second input terminal, the third input terminal and the fourth input terminal of claim 1 correspond to the input terminals 11, 12, 13 and 14, respectively, and the first input terminal of claim 1 The first output terminal, the second output terminal, the third output terminal, the fourth output terminal, the fifth output terminal, and the sixth output terminal are output terminals 21, 22, 23, 24, and 25, respectively.
And 26.

The first distributor and the second distributor of claim 2 correspond to the distributors 36 and 37, respectively. The terminator of claim 3 corresponds to the terminator 39. The antenna device of this aspect is designed assuming that it is used as an antenna of a terminal station of a system that performs wireless communication indoors. The antenna device is installed horizontally near the floor of the room as shown in FIG. 3, for example, and is a terminal station that performs wireless communication with a base station located near the ceiling at the center of the side wall of the room. It can be used as an antenna device.

This antenna device is required to have a sufficient antenna gain in the upward direction inclined with respect to the direction parallel to the plane (horizontal plane in the example of FIG. 3). As shown in FIG. 1, this antenna device is a planar antenna, and four element antennas 51 to 5 formed on a dielectric substrate 44.
It is equipped with 4. The four element antennas 51 to 54 are all microstrip antennas having the same structure.

The element antenna 51, as shown in FIG.
Circular patches 4 arranged on the front surface of the dielectric substrate 44
1, the main plate 42 and the coaxial cable 4 arranged on the back surface
It is composed of three. The circular patch 41 and the base plate 42 are
It is formed of a conductive metal foil attached to the surface of the dielectric substrate 44. The circular patch 41 is formed in a circular shape as shown in FIG. The feeding point of the antenna is set at a position slightly deviated from the center of the circular patch 41. The other element antennas 52 to 54 and 61 to 64 have the same configuration as that of FIG. Further, the electromagnetic waves emitted from the element antennas 51 to 54 are circularly polarized waves.

As shown in FIG. 1, four element antennas 5
1 to 54 are arranged at equal intervals in a counterclockwise order on the circumference of a diameter of 0.4λo (λo is a free space wavelength of the frequency used by the antenna). The four element antennas 51 to 54 may be arranged in a clockwise order. As shown in FIG. 4, the electric circuit of this antenna device is composed of an antenna array 10 including element antennas 51 to 54 and a feeding circuit 100. The feeding circuit 100 includes two 90-degree hybrid circuits 31 and 32, three 90-degree phase shifters 33, 34 and 35, and two dividers 3.
6, 37, a double-pole double-throw switch 38, and a terminating device 39 are provided.

Here, for the sake of convenience, assuming that this antenna device is used as a transmitting antenna, the feeding circuit 10 will be described.
Description will be given by assigning input and output names to the terminals of each device inside the 0. The double-pole double-throw switch 38 can select two kinds of states by external control. In the first selected state, the input terminal 38a and the output terminal 25 are connected, and the input terminal 15 and the output terminal 26 are connected. In the second selection state, the input terminal 38a and the output terminal 26 are connected, and the input terminal 15 and the output terminal 25 are connected.

The power feed input terminal 30 is a double pole double throw switch 3
8 input terminals 38a. The input terminal 15 of the double-pole double-throw switch 38 is terminated by the terminating device 39. Two output terminals 25 and 2 of the double pole double throw switch 38
6 is connected to distributors 36 and 37, respectively.
The distributor 36 distributes the electric power from the output terminal 25 of the double-pole double-throw switch 38 into two systems and outputs it. The distributor 37 is
Electric power from the output terminal 26 of the double-pole double-throw switch 38 is distributed to two systems and output.

One of the electric power distributed by the distributor 36 into two systems is the input terminal 1 of the 90-degree hybrid circuit 31.
The other one is applied to the input terminal 13 of the 90-degree hybrid circuit 32 through the 90-degree phase shifter 35. 9
The 0 degree phase shifter 35 generates a 90 degree phase difference between its input and output. Further, one of the electric power distributed by the distributor 37 into two systems is applied to the input terminal 12 of the 90-degree hybrid circuit 31, and the other is applied to the input terminal 14 of the 90-degree hybrid circuit 32.

In the 90-degree hybrid circuit 31,
The signal at the input terminal 11 and the signal at the output terminal 21 are in phase with each other. Further, the signal at the input terminal 12 and the signal at the output terminal 22 are in phase with each other. 90 degree hybrid circuit 3
2, the signal at the input terminal 13 and the signal at the output terminal 23 are in phase with each other, and the signal at the input terminal 14 and the signal at the output terminal 24 are in phase with each other.

Output terminal 2 of 90-degree hybrid circuit 31
An element antenna 51 is connected to 1. Also, 9
The output terminal 22 of the 0-degree hybrid circuit 31 is connected to the element antenna 53 via the 90-degree phase shifter 33.
The 90-degree phase shifter 33 generates a 90-degree phase difference between its input and output. The element antenna 52 is connected to the output terminal 23 of the 90-degree hybrid circuit 32. In addition, the output terminal 24 of the 90-degree hybrid circuit 32,
The element antenna 54 is connected via the 90-degree phase shifter 34. The 90 degree phase shifter 34 generates a 90 degree phase difference between its input and output.

Next, the operation of the power supply circuit 100 shown in FIG. 4 will be described. First, assume that the double-pole double-throw switch 38 is set to the first selection state. In this case, the electric power input from the power supply input terminal 30 passes from the output terminal 25 through the distributor 36 to the input terminal 11 of the 90-degree hybrid circuit 31 and the input terminal 13 of the 90-degree hybrid circuit 32.
Applied to.

In this case, the input terminal 12 of the 90-degree hybrid circuit 31 and the input terminal 14 of the 90-degree hybrid circuit 32 are terminated by the terminating device 39 via the distributor 37 and the double-pole double-throw switch 38. The electric power applied to the input terminal 11 of the 90-degree hybrid circuit 31 is branched into two systems inside the 90-degree hybrid circuit 31, and appears at the output terminal 21 and the output terminal 22.

Output terminal 2 of 90-degree hybrid circuit 31
The power in phase with the input terminal 11 appears at 1. This electric power is supplied to the element antenna 51. Further, at the output terminal 22 of the 90-degree hybrid circuit 31, electric power having a phase shift difference of 90 degrees with respect to the input terminal 11 appears, and this electric power is further fed to the element antenna 53 via the 90-degree phase shifter 33. It

On the other hand, at the output terminal 23 of the 90-degree hybrid circuit 32, power in phase with the power at the input terminal 13 appears, and this power is supplied to the element antenna 52. Also,
At the output terminal 24 of the 90-degree hybrid circuit 32, electric power having a phase shift difference of 90 degrees with respect to the input terminal 13 appears,
This electric power is further supplied to the element antenna 54 via the 90-degree phase shifter 34.

The phase of the electric power applied to the element antenna 51 is the same as that of the power feeding input terminal 30. Further, the electric power applied to the element antenna 52 is 90 degrees with respect to the power feeding input terminal 30 due to the influence of the phase change by the 90-degree phase shifter 35.
Phase difference occurs. Further, the electric power applied to the element antenna 53 has a phase shift difference of 180 degrees with respect to the power feeding input terminal 30 due to the phase change inside the 90 degree hybrid circuit 31 and the influence of the 90 degree phase shifter 33. Further, the power applied to the element antenna 54 is affected by the 90-degree phase shifter 35, the phase change in the 90-degree hybrid circuit 32, and the influence of the 90-degree phase shifter 34.
A phase shift difference of 270 degrees occurs.

Therefore, when the double-pole double-throw switch 38 is set to the first selected state, the four element antennas 51, 52, 53 and 54 arranged counterclockwise are respectively 0 °, 90 °, It is sequentially excited with electric power having a phase difference of 180 degrees and 270 degrees. Next, assume that the double-pole double-throw switch 38 is set to the second selected state. In this case, the electric power input from the power supply input terminal 30 is supplied from the output terminal 26 via the distributor 35 to the 90-degree hybrid circuit 3
1 is applied to the input terminal 12 and the input terminal 14 of the 90-degree hybrid circuit 32.

In this case, the input terminal 11 of the 90-degree hybrid circuit 31 is terminated by the terminating device 39 via the distributor 36 and the double-pole double-throw switch 38. Further, the input terminal 13 of the 90-degree hybrid circuit 32 has a 90-degree phase shifter 35,
Termination device 39 terminates through distributor 36 and double pole double throw switch 38. The electric power applied to the input terminal 12 of the 90-degree hybrid circuit 31 is branched into two systems inside the 90-degree hybrid circuit 31, and appears at the output terminal 21 and the output terminal 22.

Output terminal 2 of 90-degree hybrid circuit 31
At 1, the electric power having a phase difference of 90 degrees with respect to the input terminal 12 appears. This electric power is supplied to the element antenna 51. In addition, the output terminal 22 of the 90-degree hybrid circuit 31
, The power of the same phase as the input terminal 12 appears, and this power is 9
Electric power is supplied to the element antenna 53 via the 0-degree phase shifter 33.

The electric power applied to the input terminal 14 of the 90-degree hybrid circuit 32 is branched into two systems inside the 90-degree hybrid circuit 32 and appears at the output terminal 23 and the output terminal 24. Electric power having a phase difference of 90 degrees with respect to the input terminal 14 appears at the output terminal 23 of the 90-degree hybrid circuit 32, and this electric power is supplied to the element antenna 52. Further, electric power in phase with the input terminal 14 appears at the output terminal 24 of the 90-degree hybrid circuit 32, and this electric power is supplied to the element antenna 54.

The power applied to the element antenna 51 is 9
Since the phase changes by 90 degrees inside the 0-degree hybrid circuit 31, it has a phase difference of 90 degrees with respect to the power supply input terminal 30. The power applied to the element antenna 52 is 9
Since the phase changes by 90 degrees inside the 0-degree hybrid circuit 32, it has a phase difference of 90 degrees with respect to the power supply input terminal 30.

The power applied to the element antenna 53 is 9
Since the phase is changed by 90 degrees by the 0-degree phase shifter 33, the phase difference is 90 degrees with respect to the power supply input terminal 30. Further, the phase of the electric power applied to the element antenna 54 is changed by 90 degrees by the 90-degree phase shifter 34, and thus has a phase difference of 90 degrees with respect to the power supply input terminal 30. That is, when the double-pole double-throw switch 38 is set to the second selected state, the element antennas 51 to 54 are excited by electric powers having the same phase (90 ° phase difference with respect to the power feeding input terminal 30). . Therefore, by switching the selection state of the double-pole double-throw switch 38, it is possible to select the combination of the phases of the electric power supplied to the antenna array 10.

The directional characteristics of the antenna device shown in FIG. 1 are shown in FIG.
Shown in. FIG. 5 shows two types of directional characteristics that can be selected by switching the selection state of the double-pole double-throw switch 38. In FIG. 5, Z perpendicular to the substrate surface of the antenna device is shown.
Relative output in each direction inclined with respect to the Z axis with the axial direction at 0 degree is shown as the directional characteristic. In FIG. 5, the directional characteristic when the double-pole double-throw switch 38 is set to the first selected state is shown by a dotted line, and the double-pole double-throw switch 38 is set to the second position.
The directional characteristic when set to the selected state is indicated by a solid line.

The beam shape of the directional characteristic shown by the dotted line in FIG. 5 is V on the plane perpendicular to the plane of the antenna device.
It is in the shape of a letter and has an annular shape in a plane parallel to the plane of the antenna device. Referring to FIG. 5, it can be seen that the directional characteristics of this antenna device change significantly depending on the selection of the combination of the phases of the powers applied to the four element antennas 51 to 54. In other words, this antenna device is a double pole double throw switch 3
By switching the selection state of 8, the antenna can be used as an antenna similar to the 2-sector antenna.

In this example, the antenna array 1 shown in FIG.
0 and each component of the feeding circuit 100 are configured as a planar circuit using a microstrip line. Moreover, in order to realize a planar circuit, the 90-degree hybrid circuits 31 and 32 are configured as branch line hybrid circuits. A rat race circuit may be used instead of the branch line hybrid circuit.

The respective constituent elements of this antenna device are actually arranged as shown in FIG. The configuration of FIG. 6 is the same as that of FIG. 4, only the arrangement is changed. As shown in FIG. 6, in this example, the lines connecting all the components are connected without crossing each other. Since all lines do not intersect, the antenna array 10 and the feeding circuit 10
All 0 components can be configured as a microstrip line planar circuit on a single substrate.

As a result, the entire antenna device can be made thin. Further, since it can be manufactured only by the printing technique, it is suitable for mass production, and at the same time, there is an advantage that it is easy to realize cost reduction.

[0050]

As described above, the antenna device according to the present invention has four types of element antennas arranged on a predetermined circumference, and two kinds of in-phase excitation and sequential excitation are selected by switching the switching means. The excitation mode can be selected.

Thus, the antenna device capable of selecting two types of beams, that is, the beam formed in the front direction of the antenna substrate and the annular beam is realized with a simple structure. When this antenna device is used as an antenna of a terminal station placed on the floor or the like, it is possible to respond to changes in the arrival angle of electromagnetic waves from a base station installed on the ceiling by selecting the type of beam. It is possible. That is, stable communication quality can be ensured by selecting the beam in the front direction when it is directly below the base station and selecting the annular beam at the position away from the front.

Further, a planar antenna made of a conductive metal material on a dielectric substrate and a foil is used as the element antenna, and the feeding circuit can be constructed by a planar structure such as a branch line hybrid circuit or rat race circuit. By using the constituent elements, the entire antenna device can be configured in a plane. As a result, the antenna device can be manufactured only by the printing technique. Therefore, since it is suitable for mass production, there is an advantage that the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of an antenna device.

FIG. 2 is a vertical cross-sectional view showing one element antenna included in the antenna device of FIG.

FIG. 3 is a perspective view showing an actual arrangement example of an antenna device.

FIG. 4 is a block diagram showing a configuration of a power supply circuit of the antenna device of FIG.

5 is a graph showing directional characteristics of the antenna device of FIG.

FIG. 6 is a block diagram showing an arrangement example of each component of the antenna device of FIG.

FIG. 7 is a graph showing directional characteristics of a conventional antenna device.

[Explanation of symbols]

10 antenna array 11,12,13,14,15,38a Input terminal 21,22,23,24,25,26 Output terminals 30 Power input terminal 31,32 90 degree hybrid circuit 33,34,35 90 degree phase shifter 36,37 distributor 38 double pole double throw switch 39 Terminator 41 circular patch 42 Main plate 43 coaxial cable 44 Dielectric substrate 51, 52, 53, 54 element antenna 100 power supply circuit

Continuation of front page (56) Reference JP-A-7-142926 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01Q 21/22 H01Q 13/08 H01Q 3/24 H01Q 3 / 30

Claims (5)

(57) [Claims] 1. A first element antenna, a second element antenna,
An antenna array in which a third element antenna and a fourth element antenna are arranged on a predetermined circumference in a clockwise or counterclockwise order at substantially equal intervals, a first 90-degree phase shifter, and a second 90-degree phase shifter. Degree phase shifter, a third 90 degree phase shifter, a first input terminal, a second input terminal, a first output terminal and a second output terminal, and the first output terminal is the First
A first hybrid circuit connected to the element antenna and having the second output terminal connected to the third element antenna via the first 90-degree phase shifter; a third input terminal; An input terminal, a third output terminal, and a fourth output terminal, wherein the third output terminal is the second terminal
A second hybrid circuit connected to an element antenna and having the fourth output terminal connected to the fourth element antenna via the second 90-degree phase shifter; a power supply input terminal; a fifth output terminal And a sixth output terminal, wherein the fifth output terminal is connected to the first input terminal of the first hybrid circuit and is connected to the second output terminal via the third 90-degree phase shifter. The third input terminal of the hybrid circuit is connected, the second input terminal of the first hybrid circuit and the fourth input terminal of the second hybrid circuit are connected to the sixth output terminal, and the power feeding input An antenna device, comprising: switching means for selectively connecting a terminal to the fifth output terminal and the sixth output terminal. 2. The antenna device according to claim 1,
A first distributor for connecting a fifth output terminal of the switching means to a first input terminal of the first hybrid circuit and one end of the third 90-degree phase shifter; and a sixth distributor of the switching means. An antenna device, further comprising: a second distributor that connects the output terminal of the second input terminal to the second input terminal of the first hybrid circuit and the fourth input terminal of the second hybrid circuit. 3. The antenna device according to claim 1,
An antenna device characterized in that the switching means comprises a double-pole double-throw switch having a fifth input terminal, and a terminating device is connected to the fifth input terminal. 4. The antenna device according to claim 1,
The antenna array, first 90-degree phase shifter, second 90-degree phase shifter
Degree phase shifter, third 90 degree phase shifter, first hybrid circuit, second hybrid circuit and switching means using a dielectric substrate and a conductive metal material adhered onto the dielectric substrate. An antenna device characterized by being configured as a planar circuit. 5. The antenna device according to claim 4,
An antenna device characterized in that the first hybrid circuit and the second hybrid circuit are constituted by a branch line type hybrid circuit or a rat race circuit.