JP4141418B2 - ANTENNA DEVICE AND RECEPTION DEVICE HAVING THE SAME - Google Patents

Description

  The present invention relates to an antenna device and a receiving device (including a transmitting / receiving device) including the antenna device.

  Usually, a portable receiving device is provided with a small rod-shaped antenna or a telescopic rod antenna that does not interfere with carrying (for example, see Patent Document 1). These antennas are omnidirectional. As an example of a conventional portable receiver, here, a conventional portable receiver provided with a small rod-shaped antenna will be described.

FIG. 4 shows a configuration of a main part of a conventional portable receiving device provided with a small rod antenna. In addition, in FIG. 4, the rod-shaped antenna 11 and the antenna holder 12 have shown the longitudinal cross section. The lower end 11 </ b> A of the rod-shaped antenna 11 can slide along the inner wall of the antenna holder 12. The rod-shaped antenna 11, the antenna holder 12, and the antenna terminal 13 are made of a conductive member and are electrically connected. The antenna terminal 13 is electrically connected to the receiving circuit 14. The antenna holder 12 is fixed to the inner wall of a housing (not shown) made of an insulating member by a fixing screw 15.
Japanese Patent Laid-Open No. 6-21710

  As described above, the antenna that is usually attached to the conventional portable receiving device is a small rod-shaped antenna or a rod antenna that can be expanded and contracted. Since a small rod-shaped antenna or a telescopic rod antenna is an antenna having a low gain, there is a problem that reception by a conventional portable receiving device becomes difficult in a place where radio waves are difficult to reach.

  In view of the above problems, an object of the present invention is to provide an antenna device capable of easily switching gains and a receiving device including the antenna device.

  In order to achieve the above object, an antenna device according to the present invention is an antenna device comprising a plurality of conductive members, wherein the antenna shape is variable by moving a part or all of the plurality of conductive members. The antenna shape state and the second antenna shape state in which the gain is higher and the outer size is larger than those in the first antenna shape state.

  According to the antenna device of the present invention, the gain can be easily switched by moving some or all of the plurality of conductive members. In the antenna device according to the present invention, the gain of the second antenna shape and the outer size are larger in the state of the second antenna shape than in the state of the first antenna shape. It is better to keep the device in the first antenna shape so that the antenna device does not get in the way. If the radio wave condition is bad, the antenna device according to the present invention should be in the second antenna shape to increase the gain. Good.

Also, becomes unbalanced antenna when the state of the first antenna shape, Ri Do the the unbalanced impedance than the high antenna balanced antenna when a state of the second antenna configuration, first Output terminal, second output terminal, and third output terminal, and when in the first antenna shape, all of the plurality of conductive members are located on substantially the same straight line, and the plurality of conductive members When all the members are electrically connected to the first output terminal and are in the second antenna shape, each of the plurality of conductive members has a substantially “<” shape and faces each other symmetrically. Forming a first antenna portion and a second antenna portion to be positioned, the first antenna portion being electrically connected to the second output terminal, and the second antenna portion being a third output terminal; Be electrically connected .

  A receiving device (including a transmitting / receiving device) according to the present invention is configured to include the antenna device according to the present invention described above.

Further, the antenna device according to the present invention becomes an unbalanced antenna when in the first antenna shape state, and has a balanced impedance higher than that of the unbalanced antenna when in the second antenna shape state. since the mold antenna to be provided to the receiving apparatus according to a matching circuit for performing matching of impedance matching and balanced-unbalanced between the antenna device and the wireless circuit of the present invention to the present invention. Thus, by providing the matching circuit in the receiving apparatus according to the present invention, even if the antenna apparatus according to the present invention is in the first antenna shape functioning as an unbalanced low impedance antenna, the balanced high impedance antenna is obtained. Even in the state of the functioning second antenna shape, impedance matching and balance / unbalance matching are performed between the antenna device according to the present invention and the radio circuit.

  In the receiving device according to the present invention, the antenna device and a receiving device main body to which the antenna device is connected may be connected by a plug-in jack method. As a result, the antenna device according to the present invention can be rotated 360 ° around the plug with respect to the receiver main body. Normally, the antenna device according to the present invention has directivity when it is in the state of the second antenna shape with high gain. For this reason, when the antenna device according to the present invention is in the state of the second antenna shape, the user holds the antenna device according to the present invention with a finger and holds the antenna device according to the present invention with respect to the receiver main body portion. The antenna device according to the present invention may be directed to a position where the reception state is the best by rotating the plug as an axis.

  According to the present invention, it is possible to realize an antenna device capable of easily switching gains and a receiving device including the antenna device.

  An embodiment of the present invention will be described below with reference to the drawings. The antenna device according to the present invention is an antenna device capable of taking a first antenna shape state and a second antenna shape state having a higher gain and a larger outer size than the first antenna shape state.

  An external perspective view of the antenna device according to the present invention in the state of the second antenna shape is shown in FIG. 1A, and the main part of the receiving device according to the present invention in the state of the second antenna shape The configuration is shown in FIG. In addition, in FIG.1 (b), illustration of the base material 6 is abbreviate | omitted in order to clarify electrical connection relationship.

  The antenna device of the present invention includes plate-shaped conductive members 1 to 4, conductive stoppers 5a to 5d, insulating stoppers 5e to 5h, an insulating base material 6, a three-pole plug 7, and conductive Sex pins S1 and S2. The stopper 5a is electrically connected to the plug terminal 7A, the stopper 5b is electrically connected to the plug terminal 7B, and the stoppers 5c and 5d are electrically connected to the plug terminal 7C (see FIG. 1B).

  The conductive members 1 and 2 are arranged in the order of the conductive member 2 and the conductive member 1 from the base 6 side, and are pinned to the base 6 by the pin S1. Conductive members 1 and 2 are electrically connected via pin S1.

  The conductive members 3 and 4 are arranged in the order of the conductive member 4 and the conductive member 3 from the base 6 side, and are pinned to the base 6 by the pin S2. Conductive members 3 and 4 are electrically connected via pin S2.

  Here, the positional relationship between the conductive members 1 to 4 and the stoppers 5a to 5h will be described with reference to FIG. FIG. 3 is a partial schematic view of the antenna device of the present invention viewed from a direction perpendicular to the axes of the pins S1 and S2. In FIG. 3, the same parts as those in FIG.

  The stoppers 5 a to 5 d have a sandwiching portion for sandwiching the conductive member 1 or 3. The height h1 of the sandwiched portions of the stoppers 5a to 5d is higher than the height h2 of the stoppers 5e to 5h.

  Since the lower surface height h3 of the conductive members 1 and 3 is higher than the height h2 of the stoppers 5e to 5h, the conductive member 1 does not contact the stoppers 5e and 5g by the rotation of the conductive member 1, The conductive member 3 does not contact the stoppers 5f and 5h by the rotation. On the other hand, the lower surface height h4 of the conductive members 2 and 4 is lower than the height h2 of the stoppers 5e to 5h. The conductive member 4 comes into contact with the stoppers 5f and 5h by the movement.

  In addition, the conductive member 1 is sandwiched between the sandwiching portions of the stoppers 5 a and 5 c by the rotation of the conductive member 1, and the stoppers 5 a to 5 are sandwiched between the sandwiching portions of the stoppers 5 b and 5 d by the pivoting of the conductive member 3. A height h1 of the sandwiching portion of 5d is set. Since the conductive member 1 is sandwiched between the stoppers 5a and 5c, the electrical connection between the conductive member 1 and the stoppers 5a and 5c is strong. Further, since the conductive member 3 is sandwiched between the stoppers 5b and 5d, the electrical connection between the conductive member 3 and the stoppers 5b and 5d is strong.

  Returning to FIG. 1A again, the description will be continued. From the positional relationship between the conductive members 1 to 4 and the stoppers 5a to 5h described above, the movable range of the conductive members 1 to 4 is as follows.

  The conductive member 1 is rotatable between the stopper 5a and the stopper 5c with the pin S1 as a support shaft. The conductive member 2 is rotatable between the stopper 5e and the stopper 5g with the pin S1 as a support shaft. The conductive member 3 is rotatable between the stopper 5b and the stopper 5d with the pin S2 as a support shaft. The conductive member 4 is rotatable between the stopper 5f and the stopper 5h with the pin S2 as a support shaft.

  In FIG. 1A, the conductive member 1 is held at a position sandwiched between the stoppers 5a, the conductive member 2 is held at a position contacting the stoppers 5e, and the conductive member 3 is held at a position sandwiched between the stoppers 5b. The conductive member 4 is held at a position in contact with the stopper 5f. Thereby, the conductive members 1 and 2 are electrically connected to the plug terminal 7A via the stopper 5a, and the conductive members 3 and 4 are electrically connected to the plug terminal 7B via the stopper 5b. In addition, the two conductive members 1 and 2 and the two conductive members 3 and 4 have a substantially “<” shape, and are positioned symmetrically facing each other.

  Therefore, the antenna device according to the present invention functions as an AWX (All Wave X-type) antenna when in the second antenna shape state. Since the AWX antenna has a substantially “X” shape, the outer size is large, but it is a high gain and wideband antenna. In addition, the AWX antenna has directivity in two directions, ie, the front direction of the substantially “X” shape and the opposite direction, and is balanced and has a high impedance (several hundreds Ω).

  The band characteristics of the antenna device according to the present invention in the second antenna shape will be described. When the length of each of the four conductors 1 to 4 is L and the wavelength of the received radio wave is λ, the radio frequency satisfying L = 0.25 × λ is the lower limit frequency at which a high gain can be obtained. The radio frequency satisfying L = 0.63 × λ is the upper limit frequency at which a high gain can be obtained. Since the ratio between the upper limit frequency and the lower limit frequency is a ratio of 0.63 and 0.25, it is about 2.5. That is, the antenna device according to the present invention is an antenna that can obtain a high gain (3 to 6 dB) in a wide band (upper / lower limit ratio of about 2.5) in the second antenna shape state. .

  For example, if 470 MHz of the UHF television broadcast band 470 to 770 MHz is set as the band lower limit frequency, the band upper limit frequency that is 2.5 times that is 1175 MHz. Since the frequency band of the mobile phone device is 800 to 900 MHz and lower than 1175 MHz, the antenna device according to the present invention is in the second antenna shape to receive both antennas for TV broadcasting and mobile phone calls. Performance can be improved or maintained.

  Subsequently, a receiving apparatus according to the present invention will be described with reference to FIG. The receiving apparatus according to the present invention includes the above-described antenna apparatus according to the present invention, a jack 8, a balun 9, and a receiving circuit 10.

  When the jack 8 and the plug 7 of the antenna device according to the present invention are connected, the plug terminals 7A to 7C are electrically connected to the jack terminals 8A to 8C, respectively. The balun 9 has balun terminals 9a to 9f. The balun terminal 9a is electrically connected to the jack terminal 8B, the balun terminal 9b is electrically connected to the jack terminal 8C, and the balun terminal 9d is electrically connected to the jack terminal 8A. The balun terminal 9c, which is an intermediate tap between the balun terminals 9a-9d, is grounded. The balun terminal 9e is electrically connected to the receiving circuit 10, and the balun terminal 9f is electrically connected to the receiving circuit 10 and grounded.

  When the antenna device according to the present invention is in the state of the second antenna shape, as is apparent from FIG. 1B, the conductive members 1 and 2 are electrically connected to the balun terminal 9d, and the conductive members 3, 4 Are electrically connected to the balun terminal 9a. When the antenna device according to the present invention is in the state of the second antenna shape, the antenna device is balanced and has high impedance, but is electrically connected between the balun terminals 9a-9d (between balanced and high impedance terminals). Therefore, impedance matching and balance / unbalance matching between the antenna apparatus according to the present invention and the receiving circuit 10 are performed by the balun 9.

  Next, an external perspective view of the antenna device according to the present invention in a state of the first antenna shape is shown in FIG. 2 (a), and the receiving device according to the present invention in the state of the first antenna shape is shown. The principal part structure is shown in FIG. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. In FIG. 2B, the base material 6 is not shown in order to clarify the electrical connection relationship.

  In FIG. 2A, the conductive member 1 is held at a position sandwiched between the stoppers 5c, the conductive member 2 is held at a position contacting the stoppers 5g, and the conductive member 3 is held at a position sandwiched between the stoppers 5d. The conductive member 4 is held at a position in contact with the stopper 5h. Thereby, the conductive members 1 and 2 are electrically connected to the plug terminal 7C via the stopper 5c, and the conductive members 3 and 4 are electrically connected to the plug terminal 7C via the stopper 5d. Further, the four conductive members 1 to 4 are located on substantially the same straight line.

  Therefore, the antenna device according to the present invention functions as a rod-shaped antenna when in the state of the first antenna shape. A rod-shaped antenna is a low-gain and narrow-band antenna, but its outer size is small. Further, the rod-shaped antenna is omnidirectional, unbalanced, and low impedance (several tens of ohms).

  Next, the receiving apparatus according to the present invention will be described with reference to FIG. When the antenna device according to the present invention is in the first antenna shape, the conductive members 1 to 4 are electrically connected to the balun terminal 9b, as is apparent from FIG. When the antenna device according to the present invention is in the first antenna shape, the antenna device is unbalanced and has low impedance, but is electrically connected between the balun terminals 9b-9c (between the terminals for unbalanced and low impedance). Therefore, the balun 9 performs impedance matching and balanced / unbalanced matching between the antenna device according to the present invention and the receiving circuit 10.

  As described above, in the antenna device according to the present invention, the state of the second antenna shape has a higher gain and a larger outer size than the state of the first antenna shape. Therefore, when the radio wave condition is good, the antenna apparatus according to the present invention should be in the first antenna shape so that the antenna apparatus does not get in the way, and when the radio wave condition is bad, the antenna according to the present invention. The gain may be increased by placing the device in the second antenna shape.

  The switching procedure from the first antenna shape state to the second antenna shape state in the antenna device according to the present invention is as follows. First, the conductive member 1 is rotated clockwise around the pin S1 until the conductive member 1 is sandwiched between the stoppers 5a. Next, the conductive member 2 is rotated clockwise about the pin S1 until the conductive member 2 comes into contact with the stopper 5e. Subsequently, the conductive member 3 is rotated counterclockwise about the pin S2 as a support shaft until the conductive member 3 is sandwiched between the sandwiching portions of the stopper 5b. Finally, the conductive member 4 is rotated counterclockwise about the pin S2 until the conductive member 4 contacts the stopper 5f.

  Further, in the receiving device according to the present invention, the antenna device according to the present invention and the receiving device main body portion are connected by a plug-in jack type, so that the antenna device according to the present invention plugs the receiving device main body portion. The shaft can be rotated 360 °. The antenna device according to the present invention has directivity in two specific directions perpendicular to the axis of the plug when in the state of the second antenna shape. For this reason, when the antenna device according to the present invention is in the state of the second antenna shape, the user holds the substrate 6 of the antenna device according to the present invention with his / her finger and holds the antenna device according to the present invention in the receiver main body. The antenna device according to the present invention may be directed to a position where the receiving state is the best by rotating the plug around the part.

  The present invention can also be applied to a transmission / reception device (for example, a mobile phone device) which is a kind of reception device. In this case, the receiving circuit 10 in FIGS. 1 and 2 may be replaced with a transmitting / receiving circuit.

These are figures which show the example of schematic structure of the antenna device and receiver which concern on this invention in the case of a 2nd antenna shape state. These are figures which show the example of schematic structure of the antenna device and receiver which concern on this invention in the case of a 1st antenna shape state. These are the partial schematic diagrams of the antenna apparatus of this invention. These are figures which show the example of a principal part structure of the conventional portable receiver.

Explanation of symbols

1-4 Conductive member 5a-5h Stopper 6 Substrate 7 Three-pole plug 7A-7C Plug terminal 8 Jack 8A-8C Jack terminal 9 Balun 9a-9f Balun terminal 10 Receiving circuit S1, S2 pin

Claims (3)

An antenna device comprising a plurality of conductive members, wherein the antenna shape is variable by moving all of the plurality of conductive members,
A state of the first antenna shape and a state of the second antenna shape having a higher gain and a larger outer size than the state of the first antenna shape can be taken ,
When it is in the state of the first antenna, it becomes an unbalanced antenna, and when it is in the state of the second antenna, it becomes a balanced antenna having a higher impedance than the unbalanced antenna,
A first output terminal, a second output terminal, and a third output terminal;
When in the state of the first antenna shape, all of the plurality of conductive members are located on substantially the same straight line, and all of the plurality of conductive members are electrically connected to the first output terminal,
When in the state of the second antenna, the plurality of conductive members each have a substantially “<” shape and are positioned opposite to each other symmetrically. The antenna device is characterized in that the first antenna unit is electrically connected to the second output terminal, and the second antenna unit is electrically connected to the third output terminal . A receiving device comprising: the antenna device according to claim 1; a radio circuit; and a matching circuit that performs impedance matching and balance / unbalance matching between the antenna device and the radio circuit. The receiving device according to claim 2, wherein the antenna device and a receiving device main body to which the antenna device is connected are connected by a plug-in jack method.

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