JP5653384B2 - Retransmission device - Google Patents

Description

  The present invention relates to a retransmission apparatus for retransmitting terrestrial digital broadcasts and multimedia broadcasts.

If the receiver terminal capable of receiving digital terrestrial broadcasting or multimedia broadcasting can be charged, if the sensitivity deteriorates due to noise generated during charging, there is a possibility that the broadcasting cannot be normally viewed during charging. In order to allow normal viewing of the broadcast even during charging, it is necessary to ensure a C / N (Carrier to Noise ratio) in a state where noise is generated.
In addition, since the re-transmission device transmits radio waves, it is necessary to satisfy the provisions of weak radio stations stipulated by the Radio Law (that is, satisfy a transmission output that does not require a radio station license).
Note that the VHF band is used for multimedia broadcasting.

As a charging stand having a retransmission function for retransmitting broadcasts, for example, a cradle described in Patent Document 1 is known. This cradle corresponds to a receiving terminal that receives a 2.6 GHz band satellite digital broadcast, and has a retransmission antenna for retransmitting the broadcast, and has a predetermined distance from the receiving antenna of the receiving terminal. They are arranged opposite to each other.
Also, as a retransmission apparatus that retransmits multimedia broadcasts, a multimedia broadcast re-radiation apparatus described in Patent Document 2 is known. This multimedia broadcast re-radiating apparatus has a re-transmission antenna for re-transmitting the multimedia broadcast, although there is no description of the specific configuration of the charging means, and this re-transmission antenna includes a variable attenuator, a bandpass It is formed as a pattern on a printed circuit board (circuit board) on which an amplifying part with a filter, an AGC (Automatic Gain Control) circuit and an attenuator are mounted.

JP 2005-109676 A JP 2011-239101 A

However, the cradle described in Patent Document 1 corresponds to a receiving terminal that receives a 2.6 GHz band satellite digital broadcast, and when this is applied to retransmission of VHF band multimedia broadcast, the antenna becomes large. End up. Even if it is applied to retransmission of multimedia broadcasts, if the receiving terminal antenna is a whip antenna, the whip antenna is extended or stored, so that the positional relationship facing the retransmission antenna is always maintained. Can not. For this reason, approximately the same reception sensitivity performance cannot be ensured when the antenna is extended and when the antenna is housed.
In addition, whip antennas generally do not have antenna expansion regardless of whether the receiving terminal is in a retransmission state where it receives a radio wave retransmitted by a retransmission device, or whether the receiving terminal is in a self-reception state where it directly receives a broadcast wave. Since the antenna length and matching circuit are designed so that the antenna resonance frequency coincides with the desired frequency band, the antenna resonance frequency moves to the high frequency side when the antenna is housed, and reception sensitivity performance is improved in the desired frequency band. It cannot be secured. For example, the radiation efficiency −13 dB is deteriorated to −38 dB.

  In the multimedia broadcast re-radiating device described in Patent Document 2, a re-transmission antenna is formed as a pattern on a printed circuit board (circuit board). Since the printed circuit board is placed inside the housing of the re-radiating device, the re-transmission antenna and the antenna of the receiving terminal are separated from each other by at least the thickness of the housing. The degree will be weak.

  The present invention has been made in view of such circumstances, and can satisfy the provisions of weak radio stations stipulated by the Radio Law, and even when a whip antenna is used for a receiving terminal, the antenna is substantially not expanded and retracted. It is an object of the present invention to provide a retransmission apparatus that can ensure equivalent reception sensitivity performance.

The retransmission apparatus according to the present invention includes a housing, a circuit board provided in the housing, a variable gain amplifier provided on the circuit board for amplifying an external input, and the power supplied via a power feeding unit. A retransmission antenna that transmits an output from the variable gain amplifier, and the power feeding unit is disposed at an end of the terminal mounting area on the casing on which the receiving terminal is mounted, and the retransmission antenna is In addition, the re-transmission antenna of the terminal and the antenna of the receiving terminal placed above are strongly coupled with each other by being arranged parallel to the ground pattern of the circuit board and facing the case with the housing therebetween. The gain of the retransmission antenna is reduced .

  According to the above configuration, since the power feeding unit is arranged at the end of the terminal mounting area on the casing on which the receiving terminal is mounted, the retransmission antenna of the retransmission apparatus and the antenna of the receiving terminal can be strongly coupled, and reception High reception sensitivity performance can be obtained at the terminal. That is, since there are many cases where power is supplied to the antenna of the receiving terminal from the end of the receiving terminal, by arranging the power feeding unit at the end of the terminal placement area on the housing, The antenna of the receiving terminal can be strongly coupled, and high receiving sensitivity performance can be obtained at the receiving terminal.

  When the receiving terminal has a whip antenna, the power feeding unit is arranged along the whip antenna at the time of storage. When the whip antenna is extended, the ground of the receiving terminal and the retransmission antenna are strongly coupled, and the whip antenna is When the antenna is stored, the whip antenna in the stored state overlaps the retransmission antenna in plan view, and the retransmission antenna and the receiving terminal antenna are strongly coupled. As a result, substantially the same reception sensitivity performance can be obtained when the whip antenna is extended and when the whip antenna is stored.

  In addition, according to the above configuration, the retransmission antenna is arranged in parallel with the ground pattern of the circuit board and facing the case with the housing therebetween, so that the gain of the retransmission antenna can be reduced, and the weak radio station defined by the Radio Law The retransmission antenna and the receiving terminal antenna can be arranged close to each other, and the retransmission antenna and the receiving terminal antenna can be strongly coupled. Note that the gain reduction of the retransmission antenna can also be realized by omitting the matching circuit of the retransmission antenna. Since the mismatch loss increases by omitting the matching circuit, the gain is reduced.

  In the above configuration, a plurality of retransmission antennas are provided, and the plurality of retransmission antennas selectively transmit the output from the variable gain amplifier.

  According to the above configuration, for example, by arranging the retransmission antennas at the right end and the left end of the casing of the retransmission apparatus, the reception terminal can be retransmitted regardless of whether it is located at the left end or the right end of the reception terminal. It can be strongly coupled with the transmitting antenna.

  In the above configuration, a plurality of retransmission antennas are provided, and the plurality of retransmission antennas simultaneously transmit outputs from the variable gain amplifier.

  According to the above configuration, for example, by arranging the retransmission antennas at the right end and the left end of the casing of the retransmission apparatus, the reception terminal can be retransmitted regardless of whether it is located at the left end or the right end of the reception terminal. It can be strongly coupled with the transmitting antenna. In this case, since the output from the variable gain amplifier is selectively transmitted by transmitting simultaneously from each of the plurality of retransmission antennas, the switching means such as a switch and the position of the antenna of the receiving terminal Therefore, the position detecting means for detecting the switching means and the control means for controlling the switching means based on the detection result of the position detecting means become unnecessary, and the cost can be reduced. In order to transmit simultaneously from each of a plurality of retransmission antennas, for example, a distributor may be used.

  In the above configuration, the retransmission antenna is an L-shaped monopole antenna.

  In the above configuration, the retransmission antenna is a U-shaped monopole antenna.

  According to the present invention, the weak radio station stipulated by the Radio Law can be satisfied, and even when a whip antenna is used as a receiving terminal, substantially the same reception sensitivity performance is ensured when the antenna is extended and when the antenna is stored. Can do.

It is a figure which shows schematic structure of the re-transmission apparatus which concerns on Embodiment 1 of this invention, (a) is a front view, (b) is the sectional view on the AA line of (a). 1 is a block diagram showing a schematic configuration of the retransmission apparatus in FIG. 1 and a schematic configuration of a receiving terminal that receives a broadcast wave transmitted from the retransmission apparatus. FIG. 1A shows a state where a receiving terminal having a whip antenna is placed on the re-transmission apparatus of FIG. 1, FIG. 1A shows a placement state when the whip antenna is extended, and FIG. Of the placement state in the state The figure for demonstrating the relationship between the coupling degree (S21) and radiation efficiency in the re-transmission apparatus of FIG. The front view which shows schematic structure of the retransmission apparatus which concerns on Embodiment 2 of this invention. FIG. 5 is a block diagram showing a schematic configuration of the retransmission apparatus in FIG. 5 and a schematic configuration of a receiving terminal that receives a broadcast wave transmitted from the retransmission apparatus. FIG. 5A is a diagram showing a placement state of a receiving terminal in which a receiving terminal antenna is disposed at the left end portion, and FIG. 5B is a receiving state at the right end portion with the receiving terminal placed on the retransmission apparatus of FIG. The figure which shows the mounting state of the receiving terminal with which the terminal antenna is arrange | positioned FIG. 3 is a block diagram showing a schematic configuration of a retransmission apparatus according to Embodiment 3 of the present invention and a schematic configuration of a receiving terminal that receives a broadcast wave transmitted from the retransmission apparatus. The front view which shows schematic structure of the retransmission apparatus which concerns on Embodiment 4 of this invention. FIG. 9A is a diagram showing a placement state of a receiving terminal in which a receiving terminal antenna is arranged at the right end portion, and FIG. 9B is a receiving state at the left end portion with the receiving terminal placed on the retransmission apparatus of FIG. The figure which shows the mounting state of the receiving terminal with which the terminal antenna is arrange | positioned

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1)
1A and 1B are diagrams showing a schematic configuration of a retransmission apparatus according to Embodiment 1 of the present invention, where FIG. 1A is a front view, and FIG. 1B is a cross-sectional view taken along line AA in FIG. . FIG. 2 is a block diagram showing a schematic configuration of a retransmission apparatus according to the present embodiment and a schematic configuration of a receiving terminal that receives a broadcast wave such as terrestrial digital broadcast or multimedia broadcast transmitted from the retransmission apparatus. It is.

  1 and 2, a retransmission apparatus 1 according to the present embodiment includes a housing 2, a circuit board 3 provided in the housing 2, a circuit board 3, and reception by an external antenna 4. The variable gain amplifier 5 that amplifies the broadcast wave (external input) of the terrestrial digital broadcast or the multimedia broadcast, the power supply unit 6, and the output from the variable gain amplifier 5 fed via the power supply unit 6 are transmitted. A retransmission antenna 7. On the other hand, as shown in FIG. 2, a receiving terminal antenna 52 is connected to the receiving terminal 50 via a power feeding unit 51.

  As shown in FIG. 1, the power feeding unit 6 of the retransmitting device 1 is disposed at the end of the terminal placement area 21 on the housing 2 on which the receiving terminal 50 is placed. The re-transmission antenna 7 of the re-transmission apparatus 1 is arranged in parallel to the ground pattern 8 of the circuit board 3 of the re-transmission apparatus 1 and facing the housing 2 with a space therebetween. When the receiving terminal antenna 52 of the receiving terminal 50 is a whip antenna, consideration is given to the whip antenna being in a state where the whip antenna is housed. The retransmission antenna 7 of the present embodiment is a planar L-shaped monopole antenna and is attached to the outer surface of the housing 2.

  By arranging the power feeding unit 6 of the retransmitting apparatus 1 at the end of the terminal placement area 21 on the casing 2 on which the receiving terminal 50 is placed, the retransmitting antenna 7 of the retransmitting apparatus 1 and the receiving terminal 50 The receiving terminal antenna 52 is strongly coupled. 3 shows a state where a receiving terminal 50 using a whip antenna as the receiving terminal antenna 52 is placed on the retransmission apparatus 1 according to the present embodiment, and FIG. 3A shows a state where the whip antenna is extended. The figure which shows a mounting state, (b) is a figure which shows the mounting state in the state which accommodated the whip antenna. As shown in FIG. 3A, when the receiving terminal antenna 52 of the receiving terminal 50 is extended, the ground (not shown) of the receiving terminal 50 and the retransmission antenna 7 are strongly coupled. As shown in FIG. 3B, when the receiving terminal antenna 52 is housed, the receiving terminal antenna 52 and the retransmission antenna 7 in the housed state are strongly coupled. Thus, in any case, the receiving terminal 50 and the retransmitting device 1 are strongly coupled, and high receiving sensitivity performance is obtained in the receiving terminal 50.

  Further, the re-transmission antenna 7 of the re-transmission device 1 is arranged in parallel with the ground pattern 8 of the circuit board 3 of the re-transmission device 1 and facing the case 2 with the housing 2 therebetween, thereby reducing the gain of the re-transmission antenna 7. Can meet the regulations of weak radio stations stipulated by the Radio Law, and the retransmission antenna 7 and the reception terminal antenna 52 can be arranged close to each other, and the degree of coupling between the retransmission antenna 7 and the reception terminal antenna 52 can be increased. . Note that the gain of the retransmission antenna 7 can be reduced by omitting the matching circuit (not shown) of the retransmission antenna 7. By omitting the matching circuit (not shown), mismatch loss increases, so that further gain reduction can be achieved.

  In addition, when the retransmitting apparatus 1 also serves as a charging stand, it is necessary to ensure C / N in a state where noise is present when the receiving terminal 50 is charged, and to satisfy the provisions of weak radio stations defined by the Radio Law. For this reason, it is desirable that the retransmission antenna 7 is strongly coupled to the receiving terminal antenna 52 and has a low antenna gain. That is, high reception sensitivity performance can be obtained by strong coupling, and C / N can be improved. Further, by reducing the antenna gain of the re-transmission antenna 7, the radiation efficiency is lowered, and the definition of the weak radio station defined by the Radio Law can be satisfied. When the gain is low, the variable gain width of the variable gain amplifier 5 can be reduced, so that the cost can be reduced by reducing the circuit scale. Assume that the degree of coupling (S21) is greater than the radiation efficiency.

  FIG. 4 is a diagram for explaining the relationship between the degree of coupling (S21) and the radiation efficiency in the retransmission apparatus 1. Pi is the transmission power amplified by the variable gain amplifier 5, Po1 is the reception power at the receiving terminal 50, and Po2 is the transmission power transmitted from the retransmission antenna 7. The degree of coupling (S21) is Po1 / Pi, and the radiation efficiency is Po2 / Pi. The degree of coupling (S21)> radiation efficiency is desirable. Ideally, the degree of coupling is 100% and the radiation efficiency is 0%.

  Thus, in the retransmission apparatus 1 according to the present embodiment, the power feeding unit 6 is arranged at the end of the terminal placement area 21 on the housing 2 on which the reception terminal 50 is placed. The retransmission antenna 7 and the reception terminal antenna 52 of the reception terminal 50 can be strongly coupled, and high reception sensitivity performance can be obtained at the reception terminal 50. In particular, when the receiving terminal antenna 52 of the receiving terminal 50 is a whip antenna, when the receiving terminal antenna 52 is extended by arranging the power feeding unit 6 along the receiving terminal antenna 52 at the time of storage, The ground and the retransmission antenna 7 can be strongly coupled. On the other hand, when the reception terminal antenna 52 is accommodated, the reception terminal antenna 52 in the accommodated state overlaps the retransmission antenna 7 in plan view. 7 and the receiving terminal antenna 52 can be strongly coupled. As a result, it is possible to ensure substantially the same reception sensitivity characteristics when the whip antenna is extended and when the whip antenna is stored.

  In addition, since the retransmission antenna 7 is arranged in parallel with the ground pattern 8 of the circuit board 3 and facing the housing 2 with the housing 2 therebetween, the retransmission antenna 7 can be reduced in gain, and the weak radio station defined by the Radio Law can be used. In addition to satisfying the regulations, the retransmission antenna 7 and the reception terminal antenna 52 can be arranged close to each other, and the degree of coupling between the retransmission antenna 7 and the reception terminal antenna 52 can be increased.

(Embodiment 2)
FIG. 5 is a front view showing a schematic configuration of a retransmission apparatus according to Embodiment 2 of the present invention. FIG. 6 is a block diagram showing a schematic configuration of the retransmission apparatus of FIG. 5 and a schematic configuration of a receiving terminal that receives a broadcast wave transmitted from the retransmission apparatus. In FIGS. 5 and 6, the same reference numerals are given to the portions common to FIGS. 1 and 2 described above.

  5 and 6, the retransmitting apparatus 1A according to the present embodiment includes two retransmitting antennas 7A and 7B, and a changeover switch 10 that switches between these retransmitting antennas 7A and 7B. Similar to the retransmission antenna 7 of the retransmission apparatus 1 according to the first embodiment described above, the retransmission antenna 7A is arranged at the right end of the terminal placement area 21 on the housing 2, and the retransmission antenna 7B is The terminal is placed on the left end of the terminal placement area 21 on the housing 2. The change-over switch 10 is a high-frequency switch, for example, adopts a mechanical contact configuration, the movable contact c is connected to the output end of the variable gain amplifier 5, the fixed contact a is connected to the retransmission antenna 7A via the power feeding unit 6A, The fixed contact b is connected to the retransmission antenna 7B via the power feeding unit 6B.

  By arranging the retransmission antenna 7A at the right end of the terminal placement area 21 on the housing 2 and arranging the retransmission antenna 7B at the left end of the terminal placement area 21, the reception terminal antenna of the reception terminal 50 is provided. Even if 52 is arranged at either the left end or the right end of the receiving terminal 50, it can be strongly coupled. 7A and 7B show a state in which the receiving terminal 50 is placed on the retransmitting apparatus 1A. FIG. 7A is a diagram showing a placing state of the receiving terminal 50 in which the receiving terminal antenna 52 is disposed at the left end, and FIG. It is a figure which shows the mounting state of the receiving terminal 50 by which the receiving terminal antenna 52 is arrange | positioned at the right end part.

  Thus, in the retransmission apparatus 1A according to the present embodiment, the retransmission antenna 7A is disposed at the right end of the terminal placement area 21 on the housing 2, and the retransmission antenna 7B is disposed at the left end. Since these retransmission antennas 7A and 7B are switched by the changeover switch 10, the retransmission apparatus 1A and the reception terminal 50 are strongly coupled regardless of whether the reception terminal antenna 52 is disposed at the left end or the right end of the reception terminal 50. be able to. Thereby, high receiving sensitivity performance can be obtained in the receiving terminal 50.

(Embodiment 3)
FIG. 8 is a block diagram showing a schematic configuration of a retransmission apparatus according to Embodiment 3 of the present invention and a schematic configuration of a receiving terminal that receives a broadcast wave transmitted from the retransmission apparatus. In FIG. 8, the same reference numerals are given to the portions common to FIGS. 2 and 6 described above.

  In FIG. 8, the retransmission apparatus 1B according to the present embodiment is the same as the retransmission apparatus 1A according to the second embodiment described above in that it includes two retransmission antennas 7A and 7B. , 7B is not switched, and the output of the variable gain amplifier 5 is divided into two to supply power to the retransmission antennas 7A, 7B simultaneously. A distributor 11 is suitable as a means for distributing the output of the variable gain amplifier 5. The distributor 11 has an input terminal a connected to the output terminal of the variable gain amplifier 5, an output terminal b connected to the retransmission antenna 7A via the power feeding unit 6A, and an output terminal c retransmitted via the power feeding unit 6B. Connected to the antenna 7B. By distributing the output of the variable gain amplifier 5, the power output to each of the retransmission antennas 7A and 7B is half that when only one is output, but the configuration can be simplified except when switching manually. At the same time, the cost can be reduced. Incidentally, when switching automatically, position detection means for detecting the position (left end or right end) of the receiving terminal antenna 52 of the receiving terminal 50, and control for controlling the changeover switch 10 from the detection result of the position detecting means. Means.

  As described above, also in the retransmission apparatus 1B according to the present embodiment, the reception terminal antenna 52 is arranged at either the left end or the right end of the reception terminal 50, similarly to the retransmission apparatus 1A according to the second embodiment described above. In addition, the retransmission apparatus 1B and the reception terminal 50 can be strongly coupled, and the reception terminal 50 can obtain high reception sensitivity performance.

(Embodiment 4)
FIG. 9 is a front view showing a schematic configuration of a retransmission apparatus according to Embodiment 4 of the present invention. In FIG. 9, the same reference numerals are given to the portions common to FIG. 1 described above. Moreover, since the schematic structure of the re-transmission apparatus which concerns on Embodiment 4 of this invention is as substantially the same as FIG. 2, suppose that FIG. 2 is used.

  In FIG. 9, the retransmission apparatus 1 </ b> C according to the present embodiment has a retransmission antenna 7 </ b> C that is a planar U-shaped monopole antenna and is attached to the outer surface of the housing 2. . The retransmission antenna 7 </ b> C is formed such that the right end reaches the right end of the terminal placement area 21 on the housing 2 and the left end reaches the left end of the terminal placement area 21 on the casing 2. With only one of these, the receiving terminal antenna 52 can be coupled regardless of whether the receiving terminal antenna 52 is disposed at the left end or the right end of the receiving terminal 50. 10A and 10B show a state in which the receiving terminal 50 is placed on the retransmitting apparatus 1C, where FIG. 10A shows a placement state of the receiving terminal 50 in which the receiving terminal antenna 52 is disposed at the right end, and FIG. It is a figure which shows the mounting state of the receiving terminal 50 by which the receiving terminal antenna 52 is arrange | positioned at the left side edge part.

  As described above, in the retransmission apparatus 1C according to the present embodiment, the right end portion reaches the right end portion of the terminal placement area 21 on the casing 2, and the left end portion is the left side of the terminal placement area 21 on the casing 2. Since it has the retransmission antenna 7C that reaches the end, the retransmission apparatus 1C and the reception terminal 50 can be strongly coupled regardless of whether the reception terminal antenna 52 is disposed at the left end or the right end of the reception terminal 50. High receiving sensitivity performance can be obtained at the receiving terminal 50.

  Note that the shape of the retransmission antenna is not limited to the above-described retransmission antenna 7 and retransmission antenna 7C, but is a shape in which the degree of coupling of the reception terminal 50 with the reception terminal antenna 52> the radiation efficiency of the retransmission antenna. Any shape is acceptable.

  The present invention can satisfy the provisions of weak radio stations stipulated by the Radio Law, and even when a whip antenna is used for the receiving terminal, it is possible to ensure substantially the same reception sensitivity performance when the antenna is extended and when the antenna is stored. Therefore, the present invention can be applied to a retransmission apparatus that retransmits terrestrial digital broadcasts and multimedia broadcasts.

1, 1A, 1B, 1C Retransmission device 2 Housing 3 Circuit board 4 External antenna 5 Variable gain amplifier 6, 6A, 6B Feeding unit 7, 7A, 7B, 7C Retransmission antenna 8 Ground pattern 10 Changeover switch 11 Divider 21 Terminal placement area 50 Receiving terminal 51 Power feeding section 52 Receiving terminal antenna

Claims (5)

A housing,
A circuit board provided in the housing;
A variable gain amplifier provided on the circuit board for amplifying an external input;
A re-transmission antenna for transmitting the output from the variable gain amplifier fed through the feeding unit,
The power feeding unit is disposed at an end portion of a terminal placement area on the casing on which the receiving terminal is placed,
The retransmission antenna is arranged in parallel with the ground pattern of the circuit board and facing the circuit board with the housing therebetween, so that the retransmission antenna of the terminal and the antenna of the reception terminal placed above are strong. A re-transmission apparatus characterized by combining and reducing the gain of the re-transmission antenna . The retransmission apparatus according to claim 1,
A retransmission apparatus comprising a plurality of retransmission antennas, wherein the plurality of retransmission antennas selectively transmit an output from the variable gain amplifier. The retransmission apparatus according to claim 1,
A retransmission apparatus comprising a plurality of retransmission antennas, wherein the plurality of retransmission antennas simultaneously transmit outputs from the variable gain amplifier. The retransmission apparatus according to any one of claims 1 to 3, wherein
The retransmission apparatus according to claim 1, wherein the retransmission antenna is an L-shaped monopole antenna. The retransmission apparatus according to any one of claims 1 to 3, wherein
The retransmission apparatus according to claim 1, wherein the retransmission antenna is a U-shaped monopole antenna.

Images