JP2011233952A - Housing integrated antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a housing integrated antenna having installation flexibility.SOLUTION: A housing integrated antenna 1 having installation flexibility comprises at least two antenna parts 2 constituting two sides of a receiver apparatus housing 6 which contains a circuit board. Each of the antenna part 2 includes a first dielectric 5, a feeding line formed on the reverse surface to the circuit board of the first dielectric, a connecting member electrically connecting the feeding line and the circuit board, and a conductor having an arbitral length of notch part and formed on the surface of the dielectric 1.

Description

  The present invention relates to a housing-integrated antenna in which an antenna is provided on a housing surface of a receiving device.

  In the case of a conventional antenna built-in receiver, for example, in the case of a slot antenna built-in type, a circuit board on which a high-frequency circuit including a conductor member made of a metal foil or a metal plate having a slot of a predetermined size, and an amplifier and an oscillator is formed. And a power supply member that electrically connects the circuit board and the conductor member. Reception is performed by transmitting a voltage induced in the conductor member by the high-frequency signal to the circuit board through the power supply member. In the antenna built-in receiving apparatus having such a configuration, since the apparatus housing and the antenna conductor member are separate, it is difficult to reduce the size and cost of the entire apparatus.

  Therefore, for example, in the slot antenna device according to Patent Document 1, one surface of a shield case (metal case) that accommodates the circuit board is used as a conductor member, and the slot and the power feeding member are provided on this surface. For this reason, a conductor member dedicated to the antenna is not required, and the entire device can be reduced in size and cost.

Japanese Patent No. 3902587

  Since the slot antenna device according to Patent Document 1 is configured as described above, it must be installed so that the shield case surface that also serves as a conductor member becomes the top surface in order to suppress deterioration of radio wave reception performance. Therefore, there was a problem that there was no installation freedom. In addition, the installation environment is limited because dust, dust, and foreign matter may enter from the slot hole provided on the top surface, leading to damage, destruction, ignition, and the like of the device.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a housing-integrated antenna having a high degree of freedom in installation.

  In the housing-integrated antenna according to the present invention, at least two different surfaces of a housing that accommodates a circuit board are respectively configured by an antenna portion, and the antenna portion includes a first dielectric and a first dielectric, respectively. A feed line formed on the back surface of the body facing the circuit board side, a connection member for electrically connecting the feed line and the circuit board, and a first dielectric body having a notch of an arbitrary length. And a conductor.

  According to the present invention, each of at least two different surfaces of the housing that accommodates the circuit board therein is configured by the antenna portion including the dielectric and the conductor having the cut portion. A high housing-integrated antenna can be provided.

It is an external appearance perspective view which shows the structure of the housing integrated antenna which concerns on Embodiment 1 of this invention. FIG. 2 is a cross-sectional view of the housing-integrated antenna according to Embodiment 1 cut along the line AA in FIG. 1. 3 is an external perspective view showing a configuration of an antenna unit of the housing-integrated antenna according to Embodiment 1. FIG. FIG. 3 is a plan view illustrating a configuration of a conductor of the housing-integrated antenna according to the first embodiment. 4 is a plan view showing a configuration of a dielectric back surface of the housing-integrated antenna according to Embodiment 1. FIG. 2 is an external perspective view showing a configuration of a dielectric of the housing-integrated antenna according to Embodiment 1. FIG. 6 is an external perspective view showing a modification of the housing-integrated antenna according to Embodiment 1. FIG. It is an external appearance perspective view which shows the structure of the antenna part of the housing integrated antenna which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
As shown in FIG. 1, the housing-integrated antenna 1 includes a receiving device and an antenna unit 2. FIG. 2 is a cross-sectional view of the housing integrated antenna 1 cut along the line AA. As shown in FIG. 2, the receiving apparatus is mainly composed of a receiving apparatus casing 6 made of a highly conductive metal member, and a circuit board 9 on which a high-frequency circuit including an amplifier and an oscillator is formed. . The receiving device housing 6 is a shield case having five surfaces other than the top surface, and a top plate that closes the opened top surface is used as the antenna unit 2.

  As shown in FIG. 3, the antenna unit 2 is configured in a state where the conductor 3 and the dielectric 5 are overlapped, and also serves as a top plate of the receiving device housing 6.

  As shown in FIG. 4, the conductor 3 is a plate-like conductor member. In the conductor 3, four cut portions 4 having a physical length that resonates at a desired reception frequency are formed by cutting out from the center of each of the four sides toward the center of the conductor 3 to operate as an antenna. By making the conductor 3 into this shape, the antenna unit 2 realizes omni directivity in the horizontal plane (xy plane shown in FIG. 1).

  In the illustrated example, a plurality of cut portions 4 are formed in the conductor 3 to form a notch antenna. However, the present invention is not limited to this, and a slot may be formed into a slot antenna, or a patch antenna or a loop antenna. Alternatively, a plate-like inverted F antenna may be used.

  Assuming that the surface of the dielectric 5 facing the circuit board 9 accommodated inside the receiver housing 6 is a back surface, the back surface of the dielectric 5 has a microstrip line 7 having the shape shown in FIGS. A power supply terminal 8 is provided. The four microstrip lines 7 have the same length and are formed so as to gather at the center position of the dielectric 5 across the four cut portions 4 of the conductor 3, and supply power to the gathering point. Terminal 8 is provided.

  As shown in FIGS. 2 and 6, a connection member 11 that protrudes toward the circuit board 9 is formed on the power supply terminal 8 of the microstrip line 7 with a conductive member, and the connection member 11 is fitted into the other circuit board 9. 10 or a connector portion is provided to electrically connect the microstrip line 7 and the circuit board 9. The connection method between the microstrip line 7 and the circuit board 9 may be other methods. For example, a connector part that protrudes toward the circuit board 9 is provided on the power supply terminal 8, and the connector part is also provided on the other circuit board 9. May be connected. As a result, the antenna unit 2 can be connected to the circuit board 9 and power can be supplied without using a coaxial cable, so that the housing-integrated antenna 1 can be made inexpensive and small.

  The microstrip line 7 and the power supply terminal 8 may be formed by etching, or a linear conductor may be formed and bonded to the dielectric 5. Further, when the linear conductor is formed, a part of the linear conductor may be formed into the connection member 11.

  If the antenna unit 2 having the above configuration is used as the top plate of the receiving device housing 6, the opening of the notch 4 is closed by the dielectric 5, so there is a risk of dust, dust and foreign matter entering the receiving device. In addition, it is possible to prevent malfunction, destruction, ignition, and the like of the housing-integrated antenna 1. Thus, there are no restrictions on the installation environment.

  There is a one-to-one relationship between the physical length of the cut section 4 and the receivable frequency, and the physical length of the cut section 4 is determined when the frequency that the housing-integrated antenna 1 should receive is set to a certain value. However, since the wavelength shortening effect by the dielectric 5 is obtained by superimposing the conductor 3 on the dielectric 5, the physical length of the cut portion 4 can be equivalently shortened. Therefore, the size of the receiving device housing 6 is not restricted by the physical length of the cut portion 4, and the size can be reduced.

  Next, the structure which provides the antenna part 2 shown in FIG. 3 also in surfaces other than the top | upper surface of the receiving device housing | casing 6 is demonstrated. FIG. 7 is an external perspective view showing the housing-integrated antenna 1 in which the top plate and the bottom plate of the receiving device housing 6 are respectively configured by the antenna unit 2. The antenna portion 2 also serving as the top plate has the same shape as the antenna portion 2 in FIG. 3, and the antenna portion 2 also serving as the bottom plate has a shape in which the antenna portion 2 in FIG. Although not shown in FIG. 7, each of the two antenna units 2 is connected to a circuit board 9 inside the receiving device housing 6.

As shown in FIG. 1, when the top plate of the receiving device housing 6 is configured as the antenna unit 2, the housing-integrated antenna 1 is oriented so that the antenna unit 2 faces the top surface in order to suppress deterioration in reception performance. It is desirable to install. Therefore, the installation direction is restricted.
On the other hand, as shown in FIG. 7, when each of the top plate and the bottom plate of the receiving device housing 6 is configured as the antenna unit 2, either antenna unit 2 may be a top surface. There are no restrictions on the top and bottom.

  As described above, by providing the antenna units 2 on the two opposing surfaces of the receiving device housing 6, there is no restriction on the installation environment, and the degree of freedom in installation is improved. Moreover, the effect of space diversity can be expected by providing a plurality of antenna units 2. In FIG. 7, the top surface and the bottom surface are illustrated as the two opposing surfaces. However, the present invention is not limited to this, and the antenna unit 2 may be provided on the front surface and the rear surface of the four side surfaces of the receiving device housing 6. The antenna unit 2 may be provided on each of the left surface and the right surface.

  Further, the resonance frequency may be changed by making the physical length of the cut portion 4 of the antenna section 2 also serving as the top plate different from the physical length of the cut portion 4 of the antenna section 2 also serving as the bottom plate. In this configuration, the housing-integrated antenna 1 can receive two different frequencies, so that the receivable bandwidth is widened, or signals with completely different frequencies (for example, UHF band and GPS of a digital television) L-Band band) can be received.

  Furthermore, the antenna unit 2 may be provided on each of two orthogonal surfaces of the receiving device housing 6. For example, when the top plate of the receiving device casing 6 and the one side plate in the direction orthogonal to the top plate are each configured by the antenna unit 2, it becomes possible to receive horizontal polarization and vertical polarization. As a result, the housing-integrated antenna 1 becomes an antenna having a different polarization plane, and an effect of polarization diversity can be expected, so that reception performance is improved.

  Note that the connection member 11 of the antenna unit 2 provided on the side surface of the receiving device housing 6 protrudes in a direction parallel to the circuit board 9, so that the connection member 11 is bent to the circuit board 9 side, for example. What is necessary is just to connect or provide the circuit board 9 by providing the projection part for receiving the connection member 11, and to connect.

  Further, the antenna unit 2 may be provided on two or more surfaces of the receiving device housing 6. For example, if the antenna unit 2 is provided on the top surface, bottom surface, and one side surface of the receiving device housing 6 or the antenna unit 2 is provided on each of the top surface and two side surfaces, antennas having different directivities and polarization directions are provided. The housing-integrated antenna 1 can be formed, and the degree of freedom of installation can be further improved, and the effects of space diversity and polarization diversity can be expected.

  As described above, according to the first embodiment, each of at least two different surfaces of the receiving device housing 6 in which the circuit board 9 is accommodated is configured by the antenna unit 2, and each of the antenna units 2 includes the dielectric 5 and the dielectric Formed on the surface of the dielectric 5, the microstrip line 7 and the power supply terminal 8 formed on the back surface of the body 5 facing the circuit board 9, the connection member 11 that electrically connects the power supply terminal 8 and the circuit board 9. And a conductor 3 having a cut portion 4 having an arbitrary length. Accordingly, any one of the plurality of antenna units 2 may be installed so as to face the top surface, and the opening of the notch 4 is closed by the dielectric 5 so that the inside of the receiver housing 6 Since dust, dust, and foreign matter are prevented from being mixed in, the degree of freedom in installation can be improved.

In particular, when at least two opposing surfaces of the receiving device housing 6 are configured by the antenna unit 2, an effect of space diversity can be expected in addition to the above effect.
In addition, when each of at least two orthogonal surfaces of the receiving device housing 6 is configured by the antenna unit 2, in addition to the above effects, an effect of polarization diversity can be expected.

Embodiment 2. FIG.
FIG. 8 is an external perspective view showing the configuration of the antenna unit 2 according to the second embodiment. In the first embodiment, the dielectric 5 is provided on one side of the conductor 3 to form the antenna unit 2. However, in the second embodiment, the dielectrics 5, 12 are provided on both sides of the conductor 3 as shown in FIG. Is provided to constitute the antenna unit 2. 8 that are the same as or equivalent to those in FIG. 1 to FIG. Although not shown, a microstrip line 7, a power supply terminal 8, and a connection member 11 are provided on the back surface of the dielectric 5.

  The antenna unit 2 shown in FIG. 8 has a configuration in which a conductor 3 in which four cut portions 4 are formed is sandwiched between a dielectric 5 and a dielectric 12. Since at least two different surfaces of the receiver housing 6 are configured by the antenna unit 2 shown in FIG. 8, the conductor 3 is covered with the dielectric 12 and is not exposed to the outside air. Performance degradation due to can be suppressed. Thus, there are no restrictions on the installation environment. Further, since the cut portion 4 of the conductor 3 is not visible from the outside, the design and aesthetics of the receiving device housing 6 are not impaired. In addition, since the conductor 3 is sandwiched between the dielectric 5 and the dielectric 12, a further wavelength shortening effect can be obtained, and the physical length of the cut portion 4 can be shortened equivalently. Therefore, the size of the receiving device housing 6 is not restricted by the physical length of the cut portion 4, and further miniaturization is possible.

  As described above, according to the second embodiment, the antenna unit 2 is configured to include the dielectric 12 that covers the surface of the conductor 3 opposite to the surface covered with the dielectric 5. For this reason, the conductor 3 can be sandwiched between the dielectrics 5 and 12 to suppress deterioration over time such as oxidation, and the installation environment is not restricted.

  In the illustrated examples of the first and second embodiments, the cut length of the cut portion 4 is fixed, but a structure that can be physically and electrically varied may be used. In the case of this configuration, the resonance frequency of the antenna unit 2 can be changed, the selectivity of the reception frequency is increased, and the reception band can be widened.

  DESCRIPTION OF SYMBOLS 1 Housing-integrated antenna, 2 Antenna part, 3 Conductor, 4 Cut | notch part, 5 Dielectric material (1st dielectric material), 6 Receiver apparatus housing, 7 Microstrip line (feeding line), 8 Feeding terminal (feeding line) ), 9 circuit board, 10 holes, 11 connecting member, 12 dielectric (second dielectric).

Claims (4)

A housing-integrated antenna in which at least two different surfaces of a housing that accommodates a circuit board are configured with antenna portions,
The antenna portions are respectively
A first dielectric;
A feed line formed on the back surface of the first dielectric facing the circuit board;
A connection member for electrically connecting the power supply line and the circuit board;
A housing-integrated antenna, comprising: a conductor formed on a surface of the first dielectric and having a cut portion having an arbitrary length.   The case-integrated antenna according to claim 1, wherein the antenna portion forms at least two opposing surfaces of the case.   The case-integrated antenna according to claim 1, wherein the antenna portion forms at least two orthogonal surfaces of the case.   4. The antenna unit according to claim 1, wherein the antenna unit includes a second dielectric that covers a surface of the conductor opposite to the surface covered with the first dielectric. 5. The housing-integrated antenna as described.

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