JPH0993015A - Antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna system with which an occupied area can be reduced inside mobile object communication equipment. SOLUTION: An antenna device 10 has structure integrating an antenna part 11 and a switching part 12. The antenna part 11 is provided with a parallelopiped substrate 13 composed of dielectric materials having barium oxide, aluminium oxide and silica as main components and a conductor 14 composed of copper or copper alloy and helically wound inside the substrate 13. One end of conductor 14 forms a power feeding part 15 for impressing a voltage to the conductor 14 and the other end forms a free end 16 inside the substrate 11. Besides, the switching part 12 is formed by arranging a switch 17, which has a switching function, inside the substrate 13 shared with the antenna part 11. On both the side faces of substrate 13 on the longer side, terminal Tx for transmission, terminal Rx for reception and terminals Vcc1 and Vcc2 for control input of the switching part 12 and terminals 18a and 18b for fixture are formed and on one side face on the shorter side, a terminal 19 for ground is formed. Thus, the antenna part and the switching part can be integrated into the same substrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for mobile communication and a local area network (LAN).

[0002]

2. Description of the Related Art FIG. 10 shows a side view of a conventional chip antenna 60. 61 is an insulator, 62 is a coil-shaped conductor provided inside the insulator 61, 63 is a magnetic body, 64a,
64b is an external connection terminal.

Next, a method of manufacturing the conventional chip antenna 60 will be described with reference to FIGS. 11 (a) to 11 (f). First, as shown in FIG. 11A, a substantially L-shape is formed in which an insulating layer 65 whose one main surface is the mounting surface of the insulator 61 is formed, and which has a lead-out end S on the other main surface of the insulating layer 65. The mold conductive pattern 66 is printed, and the high-permeability magnetic material pattern 67 is printed on the central portion of the insulating layer 65. Then, FIG.
As shown in FIG. 1B, a substantially U-shaped nonmagnetic insulating layer 68 is printed to cover the right half of the conductive pattern 66 and the right half of the insulating layer 65 (excluding the magnetic pattern 67 portion). . Next, as shown in FIG. 11C, a substantially L-shaped conductive pattern 69 is printed with one end thereof overlapping the end of the conductive pattern 66, and the magnetic pattern 70 is also formed on the magnetic pattern 67. Print.

Next, as shown in FIG. 11D, a substantially U-shaped non-magnetic insulating layer 71 is formed on the left half of the conductive pattern 69 and the left half of the insulating layer 65 except for the magnetic pattern 70. To print. Then, FIG. 11B to FIG.
The step (d) (however, the leading end is not formed) is repeated until a predetermined number of times is reached, and when a predetermined number of windings is obtained, as shown in FIG. 11E, the substantially U-shaped conductive pattern 72 is formed. Is printed with one end thereof overlapping the end of the conductive pattern 69, and the other end is exposed to the end of the non-magnetic insulator layer 71 to form the lead-out end F. In this way,
The coiled conductor 62 having the lead-out ends S and F is formed by the conductive patterns 66, 69 and 72.

Finally, as shown in FIG. 11 (f), an insulating layer 73 is printed on the entire surface, and the stacking is completed. In this way, the insulator 61 becomes the insulator layers 65, 68, 71 and 73.
The magnetic body 63 is formed by the magnetic patterns 67 and 70. This laminated body is fired at a predetermined temperature and time to form an integrated sintered body, and thereafter, the external connection terminals 64a and 6 are attached to the lead-out ends S and F.
4b is applied and baked to obtain the chip antenna 60.

[0006]

However, in the conventional antenna device, when a switching unit is required to switch a plurality of conventional chip antennas having different resonance frequencies, the conventional chip antenna and the switch are used. Since the switching unit composed of a duplexer or the like cannot be integrated, there is a problem that the antenna device itself becomes large.

There is also a problem that this antenna device occupies a large portion of the mobile communication device, and it is difficult to miniaturize the mobile communication device.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide an antenna device capable of reducing its occupied area in a mobile communication device.

[0009]

In order to solve the above problems, the present invention provides a base made of at least one of a dielectric material and a magnetic material, and a conductor formed on at least one of the surface and the inside of the base. An antenna unit having at least one feeding unit formed inside the base body for applying a voltage to the conductor; and a switching unit for switching at least one transmission signal and at least one reception signal, The switching unit is disposed on at least one of the surface and the inside of the base of the antenna unit.

Further, the switching unit is a switch.

Further, the switching unit is a duplexer.

Further, the switching unit comprises a band elimination filter and a band pass filter.

According to the antenna device of the present invention, the antenna section and the switching section can be integrated on the same base.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In each of the embodiments, the same or equivalent parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

1 and 2 are a perspective view and a block diagram of a first embodiment of an antenna device according to the present invention. The antenna device 10 has a structure in which the antenna unit 11 and the switching unit 12 are integrated.

The antenna portion 11 is composed of a rectangular parallelepiped base 13 made of a dielectric material containing barium oxide, aluminum oxide and silica as a main component, and copper or a copper alloy, and is spirally wound inside the base 13. A conductor 14 is provided. Then, one end of the conductor 14 forms a power feeding portion 15 for applying a voltage to the conductor 14, and the other end forms a free end 16 inside the base 11.

Further, the switching unit 12 includes the antenna unit 11
And the base 13 are shared, and a switch 17 having a switching function is arranged inside the base 13. This switch 1
As shown in the manufacturing method of FIG. 3, 7 is composed of a shield electrode, a capacitor electrode, and a distributed constant line.

Furthermore, one of the opposite side surfaces of the base body 13,
That is, the transmission terminal Tx, the reception terminal Rx and the control input terminals Vcc1 and V of the switching unit 12 are provided on both side surfaces on the long side.
cc2 and the fixing terminals 18a and 18b are formed, and the grounding terminal 19 is formed on the other opposing side surface, that is, the one side surface on the short side.

At this time, the power feeding portion 15 of the antenna portion 11 is
Inside the base body 13, it is connected to the first port 20 of the switch 17 of the switching unit 12, and the transmission terminal Tx and the reception terminal Rx of the switching unit 12 are respectively inside the base body 13 and the second port of the switch 17. Are connected to the port 21 and the third port 22.

Then, the transmitting circuit 23 connected to the transmitting terminal Tx and the receiving circuit 24 connected to the receiving terminal Rx.
When the resonance frequencies are different between and, the transmission circuit 23 side is turned on during transmission, that is, the first port 20 and the second
, And the transmission signal is sent from the transmission circuit 23 to the conductor 14 via the power feeding unit 15 of the antenna unit 11.
On the other hand, at the time of reception, the receiving circuit 24 side is turned on, that is, the first port 20 and the third port 22 are connected, and the received signal is sent from the conductor 14 of the antenna unit 11 to the receiving circuit 24 via the power feeding unit 15.

Next, referring to FIG. 3, the antenna device 10
Will be described. The base 13 shared by the antenna unit 11 and the switching unit 12 is formed by laminating rectangular sheet layers 13a to 13i made of a dielectric material containing barium oxide, aluminum oxide, and silica as a main component. this house,
On the surfaces of the sheet layers 13b and 13h, shield electrodes 25a and 25b forming the switch 17 are printed, vapor-deposited,
It is provided by laminating or plating. Further, on the surfaces of the sheet layers 13c and 13g, the linear conductive patterns 14a to 14h forming the conductor 14 and the capacitor electrodes 26a and 26b forming the switch 17 are provided.
The sheet layer 13g is provided with via holes 27 formed in the thickness direction while being provided by printing, vapor deposition, laminating, or plating.

Further, on the surface of the sheet layer 13e, the distributed constant line 28 constituting the switch 17 is printed, vapor-deposited,
It is provided by laminating or plating. Further, the sheet layers 13d and 13f are provided with via holes 27 formed in the thickness direction. And the sheet layer 1
By laminating 3a to 13i and connecting the conductive patterns 14a to 14h with the via holes 27, the conductor 14 which is wound spirally and has a rectangular cross section is formed, and the shield electrodes 25a and 25b and the capacitors are formed. Electrodes 26a, 2
The switch 17 is formed by 6b and the distributed constant line 28.

4 and 5 are a perspective view and a block diagram of a second embodiment of the antenna device according to the present invention. The antenna device 30 has a structure in which the antenna unit 11 and the switching unit 31 are integrated by the base body 13, and is manufactured by the same method as the antenna device 10 of the first embodiment.

The antenna section 11 has the same structure as the antenna device 10. Further, the switching unit 31 shares the antenna unit 11 and the base body 13, and the duplexer 32 having a switching function is arranged inside the base body 13. The duplexer 32 is composed of a shield electrode, a capacitor electrode, and a distributed constant line (not shown).

Furthermore, one of the opposite side surfaces of the base body 13,
That is, the transmission terminal Tx, the reception terminal Rx, and the ground terminals 33a and 33b of the switching unit 31 are provided on both side surfaces on the long side.
And fixing terminals 15a and 15b are formed,
The grounding terminal 33c is formed on the other opposing side surface, that is, the one side surface on the short side.

At this time, the power feeding section 15 of the antenna section 11 is
Inside the base 13, connected to the first port 34 of the duplexer 32 having the switching function of the switching unit 31,
The transmission terminal Tx and the reception terminal Rx of the switching unit 31
Are respectively connected to the second port 35 and the third port 36 of the duplexer 32 inside the base 13.

Then, the antenna device 10 of the first embodiment.
Similarly to the transmission circuit 23 connected to the transmission terminal Tx
And the receiving circuit 24 connected to the receiving terminal Rx have different resonance frequencies, the first port 34 and the second port 35 are connected at the time of transmission and the first port 34 at the time of reception.
The port 34 and the third port 36 are connected.

As described above, in the antenna device according to the first and second embodiments described above, the antenna part and the switching part can be integrated with the base body made of a dielectric material, so that the antenna device and the switching part have a switching function. A small and inexpensive antenna device can be obtained.

Further, since the area occupied by the antenna device can be reduced inside the mobile communication device, the mobile communication device can be downsized.

6 and 7 are a perspective view and a block diagram of a third embodiment of the antenna device according to the present invention. The antenna device 40 has a structure in which the antenna part 41 and the switching part 42 are integrated by the base body 13, and is manufactured by the same method as the antenna device 10 of the first embodiment.

The antenna section 41 differs from the antenna apparatus 10 of the first embodiment in that the conductor 14 has a first feeding section 43 and a second feeding section 44. In this case, the first power feeding portion 43 and the second
Since the power feeding unit 44 is provided, the antenna unit 41 can handle two resonance frequencies. This is similar to the case where two conductors having different conductor lengths are provided. Further, since one power feeding unit is provided for one resonance frequency, the bandwidth for each resonance frequency can be narrowed and mutual interference can be prevented.

Further, the switching unit 42 is the antenna unit 41.
And the base 13 are shared, and a switch 45 having a switching function is arranged inside the base 13. The switch 45 includes a shield electrode, a capacitor electrode, and a distributed constant line (not shown).

Furthermore, one of the opposite side surfaces of the base body 13,
That is, the transmission terminal Tx, the reception terminal Rx and the control input terminals Vcc1 and V of the switching unit 12 are provided on both side surfaces on the long side.
cc2 and the fixing terminals 18a and 18b are formed, and the grounding terminal 19 is formed on the other opposing side surface, that is, the one side surface on the short side.

At this time, the first feeding section 4 of the antenna section 41
The switch 3 having the switching function of the switching unit 42 is provided inside the base body 13 and the second power feeding unit 44, respectively.
5 is connected to the first port 46 and the second port 47, and the transmission terminal Tx and the reception terminal R of the switching unit 42.
x is connected to the third port 48 and the fourth port 49 of the switch 45 inside the base body 13, respectively.

Then, the transmitting circuit 23 connected to the transmitting terminal Tx and the receiving circuit 24 connected to the receiving terminal Rx.
When the resonance frequencies are different from each other, the transmission circuit 23 side is turned on during transmission, that is, the first port 46 and the third port
, And the transmission signal is sent from the transmission circuit 23 to the conductor 14 via the first feeding part 43 of the antenna part 41. On the other hand, at the time of reception, the receiving circuit 24 side is turned on, that is, the second port 47 and the fourth port 49 are connected, and the received signal is transmitted from the conductor 14 of the antenna unit 41 to the second power feeding unit 4.
It is sent to the receiving circuit 24 via 4.

As described above, in the antenna device according to the third embodiment, the antenna unit having two resonance frequencies and a narrow bandwidth and the switching unit including the switch having four ports are integrated. It is possible to prevent mutual interference between the transmission signal and the reception signal.

8 and 9 are a perspective view and a block diagram of a fourth embodiment of the antenna device according to the present invention. The antenna device 50 has a structure in which the antenna unit 41 and the switching unit 51 are integrated by the base 13, and is manufactured by the same method as the antenna device 10 of the first embodiment.

The antenna section 41 has the same structure as the antenna device 40 of the third embodiment. The switching unit 51 shares the antenna unit 41 and the base 13, and the band elimination filter 52 and the band pass filter 53 are arranged inside the base 13. The band elimination filter 52 and the band pass filter 53 are composed of a shield layer, a capacitor layer and a coil layer (not shown).

Furthermore, one of the opposite side surfaces of the base body 13,
That is, the transmission terminal Tx, the reception terminal Rx, and the grounding terminals 54a and 54b of the switching unit 51 are provided on both side surfaces on the long side.
The fixing terminals 18a and 18b are formed, and the grounding terminal 54c is formed on the other opposing side surface, that is, the one side surface on the short side.

At this time, the first feeding section 4 of the antenna section 41
The third and second power feeding units 44 are inside the base 13, respectively, and one port 56 of the band elimination filter 52 and one port 57 of the band pass filter 53 of the switching unit 51.
The transmission terminal Tx and the reception terminal Rx of the switching unit 51 are connected to the other port 58 of the band elimination filter 52 and the other port 59 of the band pass filter 53 inside the base body 13, respectively. There is.

Then, the transmitting circuit 23 connected to the transmitting terminal Tx and the receiving circuit 24 connected to the receiving terminal Rx.
When the resonance frequencies are different from each other, the transmission signal is transmitted from the transmission circuit 23 to the conductor 14 via the band elimination filter 52 of the switching unit 51 and the first feeding unit 43 of the antenna unit 41 at the time of transmission.

On the other hand, at the time of reception, the received signal is transmitted from the conductor 14 of the antenna section 41 to the second feeding section 44 and the switching section 51.
The signal is sent to the receiving circuit 24 via the band pass filter 53.

As described above, since the band elimination filter and the band pass filter are independent in the antenna device according to the fourth embodiment, the antenna device is designed without considering the impedance matching of the band elimination filter and the band pass filter. it can. Therefore, the design is simplified and the degree of freedom in design is widened.

In the first to fourth embodiments, the case where the base body of the antenna section and the switching section is made of a dielectric material containing barium oxide, aluminum oxide or silica as the main component has been described. The dielectric material is not limited to this dielectric material, but may be a dielectric material containing titanium oxide or neodymium oxide as a main component, a magnetic material containing nickel, cobalt, or iron as a main component, or a combination of a dielectric material and a magnetic material.

Furthermore, in the first to fourth embodiments,
The case where the switch, the duplexer, the band elimination filter and the band pass filter of the switching unit are arranged inside the substrate has been described, but they may be arranged on the surface of the substrate.

In the first to fourth embodiments, the case where the antenna section and the switching section are connected inside the base body has been described, but wiring may be provided on the surface of the base body for connection.

Furthermore, in the first to fourth embodiments,
Although the case where the spiral conductor is formed inside the base has been described, the spiral conductor may be formed on at least one of the surface and the inside of the base. Further, a meandering conductor may be formed on at least one of the surface and the inside of the base. Among these, the spiral or meandering conductor formed on the surface of the substrate is formed on the surface of the substrate after the switching portion is arranged inside the substrate or before the switching portion is arranged on the surface of the substrate.

Further, in the first to fourth embodiments, the case where the switch, the duplexer, the band elimination filter and the band pass filter are composed of the shield electrode, the capacitor electrode and the distributed constant line provided inside the substrate has been described. However, it may be a switch composed of an IC alone, an electronic component such as a diode or a resistor, or a duplexer composed of an LC filter, a band elimination filter or a band pass filter. When these switches, duplexers, band elimination filters and band pass filters are enclosed inside the substrate, the substrate functions as a package for these switches, duplexers, band elimination filters and band pass filters. There is no need to provide a package separately.
Therefore, it is possible to obtain an inexpensive antenna device which has a shortened manufacturing process and whose characteristics are not deteriorated.

Furthermore, in the third and fourth embodiments,
Although the case where one conductor has a plurality of power feeding portions has been described, it is possible to cope with a plurality of resonance frequencies even when having a plurality of conductors.

The positions of the power supply terminal, the transmission terminal, the reception terminal, the ground terminal and the fixing terminal are not essential conditions for carrying out the present invention.

[0051]

According to the antenna device of the first to third aspects, since the antenna part and the switching part can be integrated on the same substrate, the antenna and the switching function are smaller and more inexpensive. It is possible to obtain an excellent antenna device.

Further, in the mobile communication device using the antenna device, the area occupied by the antenna device can be reduced, so that the mobile communication device can be downsized.

According to the antenna device of the fourth aspect,
Since the switching unit is composed of independent band elimination filters and band pass filters, it is possible to design without considering impedance matching of the band elimination filters and band pass filters. Therefore, the design is simplified and the degree of freedom in design is widened.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of an antenna device according to the present invention.

FIG. 2 is a circuit block diagram of the antenna device of FIG.

FIG. 3 is an exploded perspective view illustrating a method of manufacturing the antenna device of FIG.

FIG. 4 is a perspective view of a second embodiment of the antenna device according to the present invention.

5 is a circuit block diagram of the antenna device of FIG.

FIG. 6 is a perspective view of a third embodiment of the antenna device according to the present invention.

FIG. 7 is a circuit block diagram of the antenna device of FIG.

FIG. 8 is a perspective view of a fourth embodiment of the antenna device according to the present invention.

9 is a circuit block diagram of the antenna device of FIG.

FIG. 10 is a sectional view of a conventional chip antenna.

FIG. 11 is a schematic plan view illustrating the method of manufacturing the chip antenna of FIG.

[Explanation of symbols]

 10, 30, 40, 50 Antenna device 11, 41 Antenna part 12, 31, 44, 51 Switching part 13 Base 14 Conductor 15, 42, 43 Feed part 17, 45 Switch 32 Duplexer 52 Band elimination filter 53 Band pass filter

Front page continuation (72) Kenji Asakura Inventor Kenji Asakura 2-10-10 Tenjin, Nagaokakyo-shi Kyoto Prefecture Murata Manufacturing Co., Ltd.

Claims (4)

[Claims] 1. A base made of at least one of a dielectric material and a magnetic material, a conductor formed on at least one of the surface and the inside of the base, and formed inside the base for applying a voltage to the conductor. An antenna unit having at least one power feeding unit, and a switching unit for switching at least one transmission signal and at least one reception signal, the switching unit being at least one of the surface and the inside of the base of the antenna unit. An antenna device characterized in that the antenna device is arranged in. 2. The antenna device according to claim 1, wherein the switching unit includes a switch. 3. The antenna device according to claim 1, wherein the switching unit includes a duplexer. 4. The switching unit comprises a band elimination filter and a band pass filter.
An antenna device according to item 1.