JP2009135679A - Dipole antenna device and wireless intercom system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve miniaturization while performing a stable and certain wireless communications by a low cost structure without receiving effect of surrounding environment, or components, a substrate, etc. inside of the device which performs wireless communications using a dipole antenna. <P>SOLUTION: In the dipole antenna device, pairs of conductor elements 210, 210, 310, 310 are symmetrically arranged in right and left on surfaces 200a, 300a of dipole antennas 200, 300 which are formed on substrates 2c, 3c. Stub patterns 211, 211, 311, 311 are arranged on corresponding positions of the pairs of the elements on the surface. Moreover, rand patterns 212, 312 which connect with the pairs of conductor elements and have capacitive or inductive loads, are arranged in positions corresponding to either one or both of the pair of the conductor elements on rear faces 200b, 300b of the dipole antennas, and magnetic sheets 213, 313 are stuck on the rear faces. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a dipole antenna device used for a device that performs wireless calling, telephone conversation, and the like in a portable mobile communication terminal or a dwelling unit, and a wireless intercom system using the dipole antenna device.

  As small antennas used in portable mobile communication terminals, antennas of various structures have been conventionally proposed. As an example, one conductor element constituting a radio wave radiating portion is ¼. There is a chip antenna of wavelength. The characteristics of this chip antenna vary depending on the position of the chip antenna and the size of the substrate, which makes it difficult to lay out the substrate. On the other hand, a dipole antenna has been proposed in which quarter-wave conductor elements are arranged symmetrically and the layout of the substrate is easy.

  As the dipole antenna, the dipole antenna having a structure in which a balun (balanced / unbalanced converter) is disposed is disclosed. According to this dipole antenna, a balun made of a coaxial conductor is disposed. However, the balun can be printed (see, for example, Patent Document 1).

JP-A-6-188610

  However, since a dipole antenna is generally larger in size than a chip antenna, it is impossible to secure a sufficient space for installing the antenna when preparing for a device that calls wirelessly or makes a call in a dwelling unit or the like. If a dipole antenna is installed in the device, the dipole antenna does not operate in a balanced manner due to the influence of the board (electronic board) on which the circuit for intercom functions such as the surrounding environment, calling, and telephone calls is mounted. Radio waves may be radiated by only one of the radiating portions provided. In solving this difficulty, although the balun described in Patent Document 1 is required, there is a problem that the cost increases.

  The present invention has been made to solve these problems, and is stable and inexpensive in structure without being affected by the surrounding environment and components / boards inside the device that performs wireless communication using a dipole antenna. An object of the present invention is to provide a dipole antenna device that enables reliable wireless communication and can be miniaturized, and a wireless intercom system using the dipole antenna device.

  In order to achieve the above-described object, a dipole antenna device according to a first aspect of the present invention includes a dipole antenna formed on a substrate, and a pair of conductor elements are disposed symmetrically on the surface of the dipole antenna. A land pattern coupled with a pair of conductor elements and having a capacitive or inductive load is disposed on the back surface of the dipole antenna at a position corresponding to one or both of the pair of conductor elements. It is.

  This dipole antenna device eliminates the need for a balun that balances the unbalanced power supply from the coaxial cable required to supply power to the substrate on which the dipole antenna is formed, and uses the surrounding environment and dipole antenna. Thus, stable and reliable balanced excitation can be performed without being affected by components, boards, and the like inside the device that performs wireless communication.

  Moreover, the dipole antenna apparatus which is the 2nd aspect of this invention is a 1st aspect of this invention. WHEREIN: A magnetic material sheet is affixed on the back surface of a dipole antenna.

  According to this dipole antenna device, it is possible to avoid radio wave interference from other substrates in the vicinity of the periphery different from the substrate on which the dipole antenna is formed, and the intensity of the radio waves (electromagnetic waves) in the vicinity of the periphery becomes uniform.

  The dipole antenna device according to the third aspect of the present invention is the dipole antenna device according to the first aspect of the present invention, wherein a stub pattern is disposed on the surface of the dipole antenna at a position corresponding to a pair of conductor elements. is there.

  According to this dipole antenna device, by using a single substrate on which a dipole antenna is formed, a radio signal transmitted and received by the dipole antenna can correspond to a plurality of frequency bands.

  The wireless intercom system using the dipole antenna device according to the fourth aspect of the present invention includes a slave unit, a master unit for establishing a call in response to a call from the slave unit, a master unit, And at least one secondary master unit for establishing a call in response to a call from the slave unit via the main master unit. Each of the main master unit and the sub master unit has a dipole antenna formed on the substrate for performing wireless communication. A pair of conductor elements are disposed symmetrically on the front surface of the dipole antenna, and a land pattern coupled with the pair of conductor elements and having a capacitive or inductive load is disposed on the back surface of the dipole antenna. It is arranged at a position corresponding to one or both of the elements.

  According to this wireless intercom system, a telephone call is made in response to a call from a slave unit, and power is supplied to a substrate on which a dipole antenna is formed in a main master unit and a sub master unit that can be called between the own devices and can make a call. This eliminates the need for a balun that balances the unbalanced power supply from the coaxial cable that is required to achieve this, and is not affected by the surrounding environment or the components / boards inside the device that performs wireless communication using a dipole antenna. Therefore, stable and reliable balanced excitation can be performed.

  In the wireless intercom system using the dipole antenna device according to the fifth aspect of the present invention, in the fourth aspect of the present invention, a magnetic sheet is attached to the back surface of the dipole antenna.

  According to this wireless intercom system, a telephone call is made in response to a call from a slave unit, and the main master unit and the sub master unit that can make a call and make a call are different from the substrate on which the dipole antenna is formed. Interference of radio waves from other substrates in the vicinity can be avoided, and the intensity of radio waves (electromagnetic waves) in the vicinity is uniform.

  Moreover, the wireless intercom system using the dipole antenna device according to the sixth aspect of the present invention, in the fourth aspect of the present invention, has a stub pattern on the surface of the dipole antenna at a position corresponding to the pair of conductor elements. It is arranged.

  According to this wireless intercom system, a single board on which a dipole antenna is formed in a main master unit and a sub master unit that perform a call in response to a call from a slave unit, call between the own devices, and can make a call. The wireless signal transmitted and received by the antenna can correspond to a plurality of frequency bands.

  According to a fourth aspect of the present invention, the wireless intercom system using the dipole antenna device according to the seventh aspect of the present invention is attached to a mounting surface such as a wall surface by a mounting bracket. In addition, radio waves radiated from the pair of conductor elements of the dipole antenna are reflected by the mounting bracket.

  According to this wireless intercom system, a call is made in response to a call from a slave unit, and the main master unit and the sub master unit that are capable of calling and calling between the own devices, While reducing the amount of radio waves radiated to the back side, the amount of radiation to the front (front) side of the main master unit and sub-master unit can be increased, enabling stable and reliable wireless communication Become.

  According to the dipole antenna device of the present invention and the wireless intercom system using the dipole antenna device, it is stable with an inexpensive structure without being affected by the surrounding environment and components / boards inside the device that performs radio communication using the dipole antenna. In addition to reliable wireless communication, a balun is unnecessary and the dipole antenna can be miniaturized.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments to which a dipole antenna device and a wireless intercom system using the dipole antenna device of the invention are applied will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a specific configuration of a wireless intercom system using a dipole antenna device according to an embodiment of the present invention. The wireless intercom system shown in the figure includes, for example, a slave unit 1 installed outside the dwelling unit, for example, at the entrance of the dwelling unit, and a slave unit 1 installed inside the dwelling unit and connected (wired) via the transmission line L. The main master unit 2 for establishing a call (hereinafter referred to as inter-slave unit call) in response to the call (hereinafter referred to as the master unit call), and installed in the dwelling unit in the same manner as the main master unit 2, A wireless communication is performed with the main master unit 2 to establish a call (hereinafter referred to as extension call) and a call (hereinafter referred to as extension call), and from the slave unit 1 via the transmission line L and the main master unit 2 Are provided in order to establish a call between the slave units in response to the call to the master unit.

  The slave unit 1 includes a slave unit operation unit 10, a video imaging unit 11, a slave unit call unit 12, a slave unit power supply unit 13, and a slave unit (for wired) interface (hereinafter referred to as a slave unit I / F) 14. It has been. Here, the subunit | mobile_unit operation part 10 is for the visitor who exists in a dwelling unit entrance to perform predetermined calling operation, for example, is comprised by the calling button.

  The image capturing unit 11 captures images (including surveillance images) in the vicinity of a visitor or the entrance to the dwelling unit. The image capturing unit 11 includes various image capturing media such as a CCD and a CMOS. Yes.

  The handset call unit 12 inputs and outputs voices (transmitted voice and received voice) for establishing a call with a resident who is in the room in the dwelling unit where the visitor calls the base unit. For example, it is composed of a microphone and a speaker.

  Further, the slave unit power supply unit 13 receives a slave unit power source (DC power source) supplied from a main master unit power source unit 23 (described later) of the main master unit 2, and the standby power source or operation of each component unit of the slave unit It is for supplying as a power source.

  Further, the slave unit I / F 14 includes a signal transmission line (by wire) from the slave unit operation unit 10 to the transmission line L, a signal transmission line from the video imaging unit 11 to the transmission line L (by wire), a slave unit call unit 12 and a transmission line (wired) between the transmission line L and a power supply line from the transmission line L to the handset power supply unit 13.

  The master unit 2 includes a master unit display unit 20, a master unit call unit 21, a main unit operation unit 22, a main unit power unit 23, a main unit control unit 24, a main unit wired interface (hereinafter referred to as a main unit). , Main master unit wired I / F) 25, main master unit radio interface (hereinafter referred to as main master unit radio I / F) 26, and main master unit antenna unit 27. As shown in the schematic external view of FIG. 2, the main unit 2 is attached to a mounting surface W such as a wall surface in a dwelling unit by a mounting bracket A as an example of the installation. Here, the main base unit display unit 20, the main base unit call unit 21, the main base unit operation unit 22, the main base unit power supply unit 23, the main base unit control unit 24, and the main base unit wired I / F 25 are the same. 1a (hereinafter referred to as a main function mounting board) 2a. The main base unit radio I / F 26 is disposed on a separate board (hereinafter referred to as a radio function mounting board) 2b different from the main function mounting board 2a. The main base antenna unit 27 is disposed on a board (hereinafter referred to as an antenna mounting board) 2c connected (wired) to the wireless function mounting board 2b via the coaxial cable 2d. Further, the main function mounting board 2a and the wireless function mounting board 2b are usually electrically wired. The main master wired I / F 25 can also be arranged on a separate base different from the main function mounting board 2a.

  In the main master unit 2, the main master unit display unit 20 has a master unit call from a visitor and an extension call from a separate resident who uses the sub master units 3, 3,. For displaying the operation information of the main master unit operation unit 22 and the like. , PDP, organic EL display, and other various display media.

  Further, the main master phone call unit 21 issues a call notification that there is a master phone call from a visitor and that there is an extension call from a separate resident who uses the secondary master phone 3, 3,. At the same time, the resident who uses the main master unit establishes a call between the slave units with the visitor, or uses the sub master unit 3, 3,... That is the extension call source or extension call destination. For example, a voice (transmitted voice, received voice) for establishing an extension call with a separate resident is input / output, and is constituted by, for example, a microphone, a speaker, and a handset.

  In addition, the main master operating unit 22 is used for a resident using the main master to call a master from a visitor or an extension call from a separate resident using the sub-master 3, 3,. Predetermined response operation for responding, Predetermined call operation for a resident using the main master unit to call another resident who uses the sub-main unit 3, 3,. For example, a call termination button or a call (extension call) button is used to terminate a call between slave units or an extension call that has been established by a resident who uses the machine. These buttons can also be provided as a touch panel on the front surface of the main master display unit 20.

  The main master power source 23 generates a DC power source by rectifying and smoothing a commercial power source, for example, AC 100V, and supplies it as a standby power source or an operating power source to each component of the main master unit. The main master control unit 24 is for controlling each part of the main master unit.

  The main base unit wired I / F 25 includes a signal transmission line (call line) between the main base unit call unit 21 and the transmission line L (wired), and a power source from the main unit power unit 23 to the transmission line L. This is for forming a signal transmission line (by wire) between the supply line, main master controller 24 and transmission line L, respectively.

  The main base unit radio I / F 26 is connected to the main base unit antenna unit 27 via the main base unit control unit 24 and the coaxial cable 2c via the signal transmission line between the main base unit antenna unit 27. This is for performing signal processing of various signals to be transmitted and received, for example, conversion from an electric signal to a radio signal, conversion from a radio signal to an electric signal, and the like.

  Further, as shown in the external views of FIGS. 3A and 3B, the main master antenna unit 27 has a length of about ½ wavelength formed on the antenna mounting substrate 2c as an example of the configuration. The dipole antenna 200 is provided. Here, on the surface 200a of the dipole antenna 200 divided at the electrical center point, a pair of quarter-wave conductor elements 210, 210 are disposed symmetrically, and the surface 200a has a pair of conductor elements 210, 210. Stub patterns 211 and 211 for impedance matching can be disposed at positions corresponding to the conductor elements 210 and 210. On the other hand, on the back surface 200b of the dipole antenna 200, for example, a copper foil land pattern 212 having a capacitive or inductive load coupled to the pair of conductor elements 210, 210 is either one of the pair of conductor elements or The magnetic material sheet 213 mainly composed of a ferromagnetic material such as iron, nickel, cobalt, etc., for example, is attached to the back surface 200b. be able to.

  The secondary master units 3, 3,... Have the same configuration, the secondary master unit display unit 30, the secondary master unit call unit 31, the secondary master unit operation unit 32, the secondary master unit power supply unit 33, and the secondary master unit control unit. 34, a secondary master unit (for wireless) interface (hereinafter referred to as secondary master unit I / F) 35 and a secondary master unit antenna unit 36 are provided. As shown in the schematic external view of FIG. 2, as an example of the installation, the back side of the secondary master unit is attached to a mounting surface W such as a wall surface in a dwelling unit by a mounting bracket B. Here, the secondary master unit display unit 30, the secondary master unit call unit 31, the secondary master unit operation unit 32, the secondary master unit power supply unit 33, and the secondary master unit control unit 34 are arranged on the same main function mounting board 3a. It is installed. The sub master unit I / F 35 is disposed on a separate wireless function mounting board 3b different from the main function mounting board 3a. The sub-master antenna unit 36 is disposed on the antenna mounting board 3c that is connected (wired) to the wireless function mounting board 3b via the coaxial cable 3d. Further, the main function mounting board 3a and the wireless function mounting board 3b are usually electrically wired.

  In the secondary master units 3, 3,..., The secondary master unit display unit 30 has a master unit call from a visitor and an extension call from a separate resident who uses the main master unit 2. For displaying the operation information and the like of the sub master unit operation unit 32, for example, by displaying the video captured by the video image capturing unit 11 of the slave unit 1, , PDP, organic EL display, and other various display media.

  Further, the sub master phone call unit 31 issues a call notification that there is a master phone call from a visitor and that there is an extension call from a separate resident using the main master phone 2, and The resident who uses the machine establishes a call between the slaves with the visitor, or makes an extension call with another resident who uses the main parent machine 2 that is the extension call source or extension call destination. Voices to be established (transmitted voice, received voice) are input / output, and are composed of, for example, a microphone, a speaker, and a handset.

  Further, the secondary master unit operation unit 32 is a predetermined unit for a resident using the secondary master unit to respond to a master unit call from a visitor or an extension call from a separate resident using the main master unit 2. Response operation, predetermined call operation for a resident who uses the secondary master unit to call another resident who uses the primary master unit 2 as an extension, and a slave unit in which a resident who uses the secondary master unit has been established For example, a call termination or call (extension call) button is configured, and these buttons are displayed on the sub-master unit display unit 30. It can also be provided as a touch panel on the front of the screen.

  The secondary master unit power supply unit 33 is for generating a DC power source by rectifying and smoothing a commercial power source, for example, AC 100V, and supplying it as a standby power source or an operating power source to each component of the secondary master unit. The secondary master control unit 34 is for controlling each component of the secondary master unit. In addition, as the sub-master power supply unit 33, various storage batteries such as a secondary battery can be applied.

  Further, the secondary master unit I / F 35 is transmitted / received by the secondary master unit antenna unit 36 via the secondary master unit control unit 34 and the coaxial cable 3 c via the signal transmission line between the secondary master unit antenna unit 36. For example, signal processing of various signals, for example, conversion from an electric signal to a radio signal, conversion from a radio signal to an electric signal, and the like.

  Furthermore, as shown in the external views of FIGS. 3A and 3B as an example of the structure of the sub-master antenna unit 37, the length of about ½ wavelength formed on the antenna mounting substrate 3c is used. The dipole antenna 300 is provided. Here, a pair of conductor elements 310, 310 are arranged symmetrically on the surface 300 a of the dipole antenna 300 divided at the electrical center point, and the pair of conductor elements 310, 310 are arranged on the surface 300 a. Stub patterns 311 and 311 for impedance matching can be disposed at positions corresponding to 310. On the other hand, on the back surface 300b of the dipole antenna 300, for example, a copper foil land pattern 312 having a capacitive or inductive load coupled to the pair of conductor elements 310, 310 is either one of the pair of conductor elements or For example, a magnetic sheet 313 mainly composed of a ferromagnetic material such as iron, nickel, cobalt, etc. is attached to the back surface 300b. be able to.

  In the wireless intercom system (using the dipole antenna device) according to the embodiment of the present invention configured as described above, a specific operation will be described below.

  When a visitor at the entrance of the dwelling unit calls a resident in the room in the dwelling unit to establish a call between the slave units, a predetermined call operation is performed by the slave unit operation unit 10 of the slave unit 1 shown in FIG. Then, a slave unit call signal is transmitted from the slave unit operation unit 10 to the master unit control unit 24 via the slave unit I / F 14, the transmission line L, and the master unit wired I / F 25 of the master unit 2. Is done.

  When receiving the slave unit call signal from the slave unit 1, the master unit control unit 24 of the master unit 2 detects that there is a master unit call by a visitor, and controls the master unit power source unit 23 to The power supply to each component of the main master unit is switched from the standby power source to the operation power source, and the slave unit power source as the operation power source switched from the standby power source is generated as the power supply to the slave unit 1. This slave unit power supply is configured from the master unit power source unit 23 via the master unit wired I / F 25, the transmission line L, the slave unit I / F 14 of the slave unit 1, and the slave unit power unit 13. Supplied to each part. In addition, the video imaging unit 11 that is activated by the supply of operation power from the slave unit power supply unit 13 starts imaging video of a visitor or the entrance to the dwelling unit. The video signal picked up by the video imaging unit 11 and processed into an electrical signal is sent to the main parent via the slave I / F 14, the transmission line L, and the main master unit wired I / F 25 of the main master unit 2. Is transmitted to the machine control unit 24.

  Further, when receiving the slave unit call signal from the slave unit 1, the master unit control unit 24 of the master unit 2 displays a call message or picture data indicating that there is a master unit call by a visitor. 20, a ringing tone or a voice message to the same effect is output from the main base unit call unit 21 to make a call notification, and similarly, video imaging of the slave unit 1 is performed based on the received video signal. The image captured by the unit 11 can be displayed on the main master display unit 20.

  Further, the main master control unit 24 of the main master unit 2 performs signal processing of the slave unit call signal and the video signal received from the slave unit 1 into radio signals via the main master unit radio I / F 26. The pair of conductor elements 210 are sent to the main master antenna unit 27 via the coaxial cable 2d and symmetrically disposed on the surface 200a of the dipole antenna 200 shown in FIG. 3A on the antenna mounting board 2c. , 210. Here, the radio signal radio waves radiated from the pair of conductor elements 210 and 210 are reflected by the mounting bracket A shown in FIG. 2, so that the main base unit is in the direction of the mounting surface W such as the wall surface in the dwelling unit. While the amount of radiation to the back side decreases, the amount of radiation to the front (front) side of the main master unit can be increased, and this radio wave is the sub master unit of the sub master units 3, 3,. The signal is stably and reliably received by the pair of conductor elements 310 and 310 disposed symmetrically on the surface 300a of the dipole antenna 300 on the antenna mounting substrate 3c constituting the antenna unit 36.

  Here, the main master antenna unit 27 of the main master unit 2 and the sub master unit antenna units 36 of the sub master units 3, 3,... Have the structure shown in FIGS. On the back surfaces 200b and 300b of the dipole antennas 200 and 300 formed on the antenna mounting substrates 2c and 3c, any one of a pair of conductor elements 210, 210, 310, and 310 disposed symmetrically with respect to the front surfaces 200a and 300a Since the land patterns 212 and 312 are arranged at positions corresponding to one or both, here, positions corresponding to either one, the unbalanced power supply from the coaxial cables 2c and 3c is balanced. Balancing is not required, and balanced excitation can be performed stably and reliably without being affected by the surrounding environment and other electronic components. Moreover, since the stub patterns 211, 211, 311 and 311 are disposed on the surfaces 200a and 300a of the dipole antennas 200 and 300 at positions corresponding to the pair of conductor elements 210, 210, 310 and 310, a single By using the antenna mounting boards 2c and 3c, it is possible to deal with a plurality of frequency bands for radio signals transmitted and received by the antenna. Further, since the magnetic sheets 213 and 313 are attached to the back surfaces 200b and 300b of the dipole antennas 200 and 300, for example, the main function mounting boards 2a and 3a and the wireless function, which are other boards in the own device. Interference of radio waves from various circuits and electronic elements mounted on the mounting boards 2b and 3b can be avoided, and the intensity of radio waves (electromagnetic waves) in the vicinity of the surroundings becomes uniform.

  In the sub-master units 3, 3,..., A pair of conductor elements 310, 310 arranged symmetrically on the surface 300a of the dipole antenna 300 on the antenna mounting substrate 3c constituting the sub-master antenna unit 36. The received radio signal is transmitted to the secondary master unit I / F 35 via the coaxial cable 3d, and is processed into the slave unit call signal and the video signal, which are electrical signals, and then sent to the secondary master unit control unit 34. Is done.

  When the sub master unit control unit 34 of the sub master unit 3, 3,... Receives the slave unit call signal transmitted from the slave unit 1 via the master unit 2, there is a master unit call by a visitor. And the secondary master unit power supply unit 33 is controlled to switch the power supply to each component of the secondary master unit from the standby power source to the operating power source. The picture data and the like are displayed on the secondary master unit display unit 30 and a ringing tone or voice message or the like indicating the same is output from the secondary master unit call unit 31 to perform the call notification. Further, the received video signal is also displayed. At the same time, the video image picked up by the video image pickup unit 11 of the slave unit 1 can be displayed on the sub-master unit display unit 30.

  Next, the call notification in the main master unit 2 and the sub master unit 3, 3,... Is responded first by any one of the resident who has confirmed the video output. The resident who performs the operation can establish a call while confirming the video of the visitor. Specifically, when a resident who uses the main master unit 2 performs a predetermined response operation at the main base unit operation unit 20, the resident uses the control unit according to the control of the main base unit control unit 24 that detects this operation. Signal transmission between the main base unit communication unit 21 and the main unit main unit wired I / F 25, the transmission line L, and the sub unit I / F 14 of the sub unit 1 used by the visitor. A line, that is, a call line is formed, and a voice call is transmitted / received via the formed call line, thereby establishing a call between slave units.

  On the other hand, as a resident who performs the response operation first, a resident using the sub-master unit 3, 3, ... performs a predetermined response operation at the sub-master unit operation unit 30 of the particular sub-master unit. Then, the sub master unit call unit 21 and the sub master unit I used by the resident are controlled by the control of the sub master unit control unit 34 that has detected this operation (and the control of the main master unit control unit 24 of the main master unit 2). / F35, secondary master antenna 36, primary master antenna 27 of primary master 2, primary master radio I / F 26, primary master controller 24, primary master wired I / F 25, transmission line L A signal transmission line between the slave unit communication unit 12 used by a visitor via the slave unit I / F 14 of the slave unit 1, that is, a call line is formed, and voice is transmitted via the formed call line. The communication between the slave units is established by transmitting and receiving signals. When this call line is formed, the radio wave of the radio signal (which is an audio signal) transmitted from the sub-master antenna unit 36 of the particular sub-master device that has made a call response is transmitted from the mounting bracket B shown in FIG. Since it is reflected, the amount of radiation to the back side of the secondary master unit that is in the mounting surface W direction such as the wall surface in the dwelling unit decreases, while the amount of radiation to the front (front) side of the secondary master unit is increased. Therefore, stable and reliable wireless communication is possible.

  In addition, according to the above description, in order to establish a call and call operation in the wireless intercom system (using the dipole antenna device) according to the embodiment of the present invention, a visitor at the entrance of the dwelling unit is present in the dwelling unit. Although the operation at the time of calling the handset that calls the resident in the base phone and establishes the communication between the handset is described, it is not limited to this operation. For example, even in the case of an extension call in which a specific resident in a room in the room calls another resident to establish an extension call, the extension of the main caller 2 that is the extension call source or extension call destination A call signal or a call signal between the main base unit antenna unit 27 and the sub base unit antenna unit 36 of a specific sub base unit that is the extension call source or the extension call destination among the sub base units 3, 3,. When transmitting and receiving wireless signals such as, the amount of radio waves radiated to the back side of the main master unit and the sub master unit can be reduced, while the front (front) of the main master unit and the sub master unit can be reduced. The amount of radio waves radiated to the) side can be increased, and stable and reliable wireless communication is possible.

  Moreover, in the wireless intercom system (using the dipole antenna device) according to the embodiment of the present invention, the slave unit 1 having the image capturing unit 11 for capturing images (including monitoring images) of visitors and dwelling entrances. However, the present invention is not limited to this mode. For example, it is possible to apply the slave unit that is provided with only the slave unit call function and the slave unit call function by a visitor whose video imaging unit 11 is incomplete.

  As is clear from the above description, according to the wireless interphone system (using the dipole antenna device) of the embodiment of the present invention, the main master unit 2 and the sub-unit that perform radio communication using the surrounding environment and the dipole antenna. Without being affected by the components and boards (2a, 2b, 3a, 3b) etc. inside each device of the master unit 3, 3,..., Stable and reliable wireless communication is possible with an inexpensive structure. Thus, no balun is required, and the dipole antennas 200 and 300 can be reduced in size.

  Finally, the dipole antenna device of the present invention and the wireless intercom system using the dipole antenna device have been described with a specific embodiment. However, the dipole antenna device is not limited to this embodiment. It goes without saying that the system of any configuration to which the antenna device can be applied, such as a portable mobile communication terminal, can be adopted.

FIG. 1 is a block diagram showing a specific configuration of a wireless intercom system using a dipole antenna device according to an embodiment of the present invention. FIG. 2 is a schematic external view showing an example of installation of a wireless intercom system using a dipole antenna device according to an embodiment of the present invention. 3A and 3B are external views showing a specific structure of the dipole antenna device according to the embodiment of the present invention.

Explanation of symbols

1 …… Slave unit 2 …… Main base unit 2c …… Antenna mounting board (board)
200 …… Dipole antenna 200a …… Dipole antenna surface 200b …… Dipole antenna back surface 210, 210 …… A pair of conductor elements 211, 211 …… Stub pattern 212 …… Land pattern 213 …… Magnetic sheet 3, 3, ... At least one secondary master unit 3c ... Antenna mounting board (board)
300 …… Dipole antenna 300a …… Dipole antenna surface 300b …… Dipole antenna back surface 310, 310 …… Pair conductor elements 311, 311 …… Stub pattern 312 …… Land pattern 313 …… Magnetic sheet A, B… … Mounting bracket W …… Mounting surface

Claims (7)

A dipole antenna (200, 300) formed on a substrate (2c, 3c) is provided, and a pair of conductor elements (210, 210, 310, 310) are symmetrical on the surface (200a, 300a) of the dipole antenna. Arranged in
On the back surface (200b, 300b) of the dipole antenna, a land pattern (212, 312) coupled with the pair of conductor elements and having a capacitive or inductive load is either or both of the pair of conductor elements. The dipole antenna device is arranged at a position corresponding to   The dipole antenna device according to claim 1, wherein a magnetic sheet (213, 313) is attached to the back surface of the dipole antenna.   2. The dipole antenna device according to claim 1, wherein stub patterns (211, 211, 311, 311) are disposed on the surface of the dipole antenna at positions corresponding to the pair of conductor elements. A wireless communication is performed between the slave unit (1), the main master unit (2) for establishing a call in response to a call from the slave unit, and the master unit, and the call is established. , Providing at least one secondary master unit (3a, 3b,...) For establishing the call in response to the call from the slave unit via the primary master unit,
The main master unit and the sub master unit each have a dipole antenna (200, 300) formed on a substrate (2c, 3c) for performing the wireless communication,
On the surface (200a, 300a) of the dipole antenna, a pair of conductor elements (210, 210, 310, 310) are disposed symmetrically,
On the back surface (200b, 300b) of the dipole antenna, a land pattern (212, 312) coupled with the pair of conductor elements and having a capacitive or inductive load is either or both of the pair of conductor elements. A wireless intercom system, which is arranged at a position corresponding to   The wireless intercom system according to claim 4, wherein a magnetic sheet (213, 313) is attached to the back surface of the dipole antenna.   5. The wireless intercom system according to claim 4, wherein stub patterns (211, 211, 311, 311) are disposed on the surface of the dipole antenna at positions corresponding to the pair of conductor elements. The wireless intercom system is attached to a mounting surface such as a wall surface by mounting brackets (A, B),
5. The wireless intercom system according to claim 4, wherein radio waves radiated from the pair of conductor elements of the dipole antenna are reflected by the mounting bracket.

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