JP5062275B2 - Receiver - Google Patents

Description

  The present invention relates to a receiving device and a wireless device including the receiving device.

  Conventionally, in a receiving apparatus for receiving radio signals used for communication and broadcasting, a signal generated by a circuit such as a CPU or a memory, an arithmetic circuit for processing a received signal, or a reference clock generator for operating them, There is a problem of internal interference in which the harmonic component of the signal becomes an interference component in the radio frequency band of the received signal and degrades the quality of the received signal.

  In recent years, receivers have become more multifunctional, and the number of circuits built in them has been increasing. In addition, as the signals handled in the receiving apparatus are digitized, the processing speed and the amount of information to be processed have increased. In addition, receiving devices are required to be further downsized, and antennas for receiving signals are becoming smaller and built-in. For this reason, the interference component of internal interference is increasing. In addition, the problem of internal interference is further aggravated by an increase in coupling between a receiving antenna and a circuit that generates an interference component due to downsizing of the receiving device.

  As countermeasures against this problem, optimization of circuit arrangement, addition of parts (for example, a bypass capacitor, a choke coil, a filter, and a shield) for suppressing unnecessary radiation of interference components may be performed. Such optimization of circuit arrangement and addition of components lead to an increase in the design man-hour of the receiving device, an increase in cost, and an increase in size of the receiving device.

  Therefore, various techniques for suppressing internal interference have been proposed as follows.

  For example, noise generated in the device is detected, and the detected noise is controlled to have the opposite phase and the same amplitude as the noise signal superimposed as an interference component on the received signal, and the noise after control is added to the received signal. There is a technique for suppressing the above (for example, see Patent Document 1). FIG. 8 shows a conventional receiving apparatus described in Patent Document 1.

  In FIG. 8, a conventional receiving device 300 is a device that displays a video signal demodulated from a received signal, for example, and a display element 115 (for example, a liquid crystal display) and a circuit board 102 are provided inside a housing (not shown). It has been.

  A matching circuit 104 for the main antenna element 103 is provided on the circuit board 102, and a power feeding terminal 113 is electrically connected to the matching circuit 104, and the power feeding terminal 113 is connected to the main antenna element 103.

  The main antenna element 103 receives the received signal and the noise signal 116 generated in the device that is an interference component of the received signal, and the received signal is output to the adder circuit via the matching circuit 104.

  The adder circuit 110 adds the reception signal output from the matching circuit 104 and the signal output from the variable gain phase circuit 109, and outputs the added signal to the reception circuit 111.

  The reception circuit 111 demodulates the signal output from the addition circuit 110 and outputs the demodulated signal to the CPU 112.

  The CPU 112 generates a signal capable of displaying an image on the display element 115 from the signal output from the receiving circuit 111, and outputs the generated video signal to the display element 115 through the signal line 114.

  For example, when generating a video signal, the CPU 112 generates a noise signal 116 as an interference component of the received signal inside the CPU 112 and radiates the noise signal 116 from the signal line 114.

  The display element 115 displays a video based on a video signal output from the CPU 112.

  The noise detection antenna 301 is disposed in the vicinity of the signal line 114 to detect the noise signal 116 radiated from the signal line 114, and is in close contact with the signal line 114 so that the noise signal 116 can be detected at a sufficient level. The arrangement structure is as follows.

  The noise detection antenna 301 detects the noise signal 116 that is an interference component of the received signal, and outputs the detected signal to the variable gain phase circuit 109.

  The variable gain phase circuit 109 variably controls the phase component and amplitude component of the detected noise signal 116, generates a signal having an opposite phase and the same amplitude as the detected noise signal 116, and outputs the generated signal to the adding circuit 110. .

  The signal output from the matching circuit 104 and the signal output from the variable gain phase circuit 109 are added by the adder circuit 110, so that the noise signal component superimposed on the received signal is suppressed.

  As described above, the conventional receiving apparatus 300 has a noise detection antenna that detects noise as an interference component in the very vicinity of a specific noise generation source such as a component such as a CPU or a substrate circuit pattern. Only the components are detected at a high level to suppress internal interference that degrades the quality of the received signal.

US Patent Application Publication No. 2006/0178157

  However, in the technique described in Patent Document 1, since a component that becomes a noise generation source and a circuit that radiates interference components are large in size, when interference components are distributed over a wide range, the detection level of interference components And the frequency characteristics cannot be sufficiently matched, and noise superimposed on the received signal cannot be sufficiently suppressed.

  In addition, when a plurality of interference components are distributed over a wide range by a plurality of noise generation sources, a plurality of noise detection antennas are provided, so that a receiving device or the like is increased in size.

  Furthermore, when a plurality of noise generation antennas are close to each other and a plurality of interference components are distributed, when a plurality of noise detection antennas are arranged close to each other, unnecessary interference components other than a desired interference component are provided. And the frequency characteristics cannot be sufficiently matched, and the noise superimposed on the received signal cannot be sufficiently suppressed. Further, due to the influence of the proximity of the noise detection antennas, the performance of the noise detection antennas deteriorates, making it difficult to obtain the required antenna performance.

  In order to solve the above-described problem, the present invention can provide a receiving apparatus that can reliably suppress internal interference regardless of the range in which interference components are distributed without increasing the size of the receiving apparatus.

In order to solve the above-described conventional problems, a receiving device according to the present invention includes a first casing, a second casing, and a conductive body in which the first casing and the second casing are rotatably connected. Hinge portion, a metal frame provided in the first housing, a circuit board having a ground pattern provided in the second housing, and the ground pattern from the circuit board to the metal frame via the hinge portion. A main antenna element that supplies unbalanced power, a first power feeding unit that feeds power from the circuit board to the hinge part, a receiving circuit that demodulates a signal received by the main antenna element, a noise signal circuit disposed on the circuit board, and a noise signal A phase / amplitude adjustment circuit that adjusts the amplitude and phase of the noise signal generated from the circuit and superimposes it on the signal received by the main antenna element, and a noise detection circuit that feeds unbalanced power from the ground pattern on the circuit board as a means for detecting the noise signal. And antenna element, a second feeding section for feeding the circuit board on the noise detection antenna elements, powered from the circuit board to the main antenna and the noise detection antenna.

  According to the above configuration, regardless of the range in which the interference components generated from one or a plurality of noise sources are distributed, the interference components can be efficiently detected without causing an increase in the size of the receiving device, and the internal interference can be reliably detected. Can be suppressed.

  As described above, according to the receiving apparatus of the present invention, regardless of the range in which the interference component is distributed, the interference component can be efficiently detected and internal interference can be reliably suppressed without increasing the size of the receiving apparatus. Can do.

FIG. 3 is a perspective view showing the configuration of the receiving apparatus according to Embodiment 1 of the present invention. The perspective view which shows the structure of the receiver in Embodiment 1 of this invention. The perspective view of the example of arrangement | positioning using the patch antenna type noise detection sensor in Embodiment 1 of this invention The perspective view of the example of arrangement | positioning using the reverse F antenna type noise detection sensor in Embodiment 1 of this invention. The front view which shows the structure of the receiver in Embodiment 2 of this invention The right view which shows the structure of the receiver in Embodiment 2 of this invention The left view which shows the structure of the receiver in Embodiment 2 of this invention The perspective view which shows the structure of the conventional receiver.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view showing a configuration of a receiving apparatus for explaining Embodiment 1 of the present invention.
FIG. 2 is a perspective view showing the configuration of the receiving apparatus for explaining the first embodiment of the present invention.

  1 and 2, the same components as those in FIG. 8 are denoted by the same reference numerals and description thereof is omitted.

In Embodiment 1, a portable receiving device will be described as an example of a receiving device.
<Configuration Example 1 (FIGS. 1 and 2)>
As shown in FIGS. 1 and 2, the receiving device 100 includes a rectangular parallelepiped housing 101 as an example of a portable housing, and the housing 101 is a resin molded product that is an insulator. ing.

  The circuit board 102 provided in the housing 101 is a printed board on which circuit components that realize various functions of the receiving apparatus 100 are mounted, and a ground pattern (not shown) that serves as a circuit ground potential is formed on almost the entire surface. Has been.

  The main antenna element 103 is an antenna element that is unbalanced with respect to the ground pattern of the circuit board 102, and operates as a monopole antenna, for example, and is separated from the ground pattern of the circuit board (for example, From the standpoint of antenna performance, it is desirable to configure 2 mm or more, or λ / 20 or more when the receiving apparatus is used in the 800 MHz band. The main antenna element 103 may be formed of a conductive plate disposed inside the housing 101 or a printed pattern on a printed board.

  The feed terminal 113a is electrically connected to the main antenna element 103 and the main antenna matching circuit 104 on the circuit board 102 by, for example, spring contact or soldering.

  The main antenna matching circuit 104 is connected to an adder circuit 110 on the circuit board 102. For example, a circuit is formed using components such as a capacitor, an inductor, and a resistor, and the impedance of the main antenna element 103 is added. Match the input impedance of circuit 110.

  The main antenna matching circuit ground 105 is a ground potential of the main antenna matching circuit 104 and is connected to a ground pattern near the matching circuit 104.

  The noise detection antenna element 106 is an antenna element that is unbalanced with respect to the ground pattern of the circuit board 102, and the noise detection antenna 106 shown in FIG. 2 operates as a monopole antenna type element. A noise signal 116 emitted from a circuit serving as a noise source that generates an interference component having the ground pattern 102 as a ground potential, for example, the CPU 112 is received. The noise detection antenna element 106 may be formed of a conductive plate, a conductive wire, or a printed pattern on a printed board disposed inside the housing 101.

  The power supply terminal 113b is electrically connected to the noise detection antenna element 106 and the noise detection antenna matching circuit 107 on the circuit board 102 by, for example, spring contact or soldering.

  The noise detection antenna matching circuit 107 is connected to a variable gain phase circuit 109 on the circuit board 102. For example, a circuit is formed using components such as a capacitor, an inductor, and a resistor. The impedance is matched to the input impedance of the variable gain phase circuit 109.

  The noise detection antenna ground point 108 is a ground potential of the noise detection antenna matching circuit 107 and is connected to a ground pattern near the matching circuit 107.

  As shown in FIGS. 1 and 2, the feeding position of the main antenna element 103, for example, the feeding position of the noise detection antenna element 106, for example, the distance L1 between the feeding terminal 113b of the noise detection antenna element 106 is It is desirable in terms of noise detection antenna performance that the configuration is within ¼ of the wavelength of the reception operating frequency band (for example, within 94 mm when used in the reception frequency band of 800 MHz). Further, the feeding position of the main antenna element 103, for example, the feeding terminal 13a, and the feeding position of the noise detection antenna element 106, for example, the feeding position of the feeding terminal 113b, as shown in FIG. It is good also as a structure arrange | positioned in the same side.

  In the receiving apparatus configured as described above, the noise detection antenna 106 fed unbalanced to the ground portion of the circuit board 102 is a noise source that generates an interference component having the ground pattern of the circuit board 102 as a ground potential. It is possible to efficiently detect a noise signal 116 radiated by a circuit such as the CPU 112. As described above, according to the present embodiment, it is possible to efficiently detect an interference component and reliably suppress internal interference without causing an increase in size of the reception device regardless of a range in which the interference component is distributed. .

  In the present embodiment, the monopole antenna is exemplified by using the main antenna element 103 as an example, but other antennas may be used as long as the antenna element is unbalanced with respect to the ground pattern of the circuit board 102.

  In the present embodiment, the CPU 112 is described as an example of a noise source. However, the noise source is a circuit having a ground portion of the circuit board 102 as a ground potential, for example, a memory circuit holding a video signal, DC / DC, or the like. There may be a power supply circuit such as a power supply or a signal processing circuit such as a liquid crystal display. Further, the noise source is not limited to a circuit mounted on the circuit board 102, but may be a circuit having a ground part that is electrically connected to the ground part of the circuit board 102 other than the circuit board 102. Even in this case, the same effect can be obtained by adopting the same configuration as described above.

  In the above configuration, the noise detection antenna 106 shown in FIG. 2 operates as a monopole antenna type element. However, other antenna configurations will be described below.

3 and 4 are perspective views showing the configuration of the receiving apparatus for explaining the first embodiment of the present invention. 3 and 4, the same reference numerals are given to the same parts as those in FIGS. 1 and 2 described above, and the description thereof is omitted. <Configuration Example 2 (FIG. 3)>
As shown in FIG. 3, the noise detection antenna element 106 is an antenna element that is unbalanced with respect to the ground pattern of the circuit board 102, and the noise detection antenna 106 shown in FIG. 3 operates as a patch antenna type element. A noise signal 116 radiated by a circuit, for example, the CPU 112, that becomes a noise source that generates an interference component having a ground pattern of the circuit board 102 as a ground potential is received. The noise detection antenna element 106 may be formed of a conductive plate, a conductive wire, or a printed pattern on a printed board disposed inside the housing 101.

In the receiving apparatus configured as described above, the noise detection antenna 106 fed unbalanced to the ground portion of the circuit board 102 is a noise source that generates an interference component having the ground pattern of the circuit board 102 as a ground potential. It is possible to efficiently detect a noise signal 116 radiated by a circuit such as the CPU 112. As described above, according to the present embodiment, it is possible to efficiently detect an interference component and reliably suppress internal interference without causing an increase in size of the reception device regardless of a range in which the interference component is distributed. .
<Configuration example 3 (FIG. 4)>
As shown in FIG. 4, the grounding terminal 117 is electrically connected to the noise detection antenna element 106 and the ground pattern on the circuit board 102 by, for example, spring contact or soldering.

  The noise detection antenna element 106 is an antenna element that is unbalanced with respect to the ground pattern of the circuit board 102, and the noise detection antenna 106 shown in FIG. 4 operates as an inverted F antenna type element. A noise signal 116 emitted from a circuit serving as a noise source that generates an interference component having the ground pattern 102 as a ground potential, for example, the CPU 112 is received. The noise detection antenna element 106 may be formed of a conductive plate, a conductive wire, or a printed pattern on a printed board disposed inside the housing 101.

  In the receiving apparatus configured as described above, the noise detection antenna 106 fed unbalanced to the ground portion of the circuit board 102 is a noise source that generates an interference component having the ground pattern of the circuit board 102 as a ground potential. It is possible to efficiently detect a noise signal 116 radiated by a circuit such as the CPU 112. As described above, according to the present embodiment, it is possible to efficiently detect an interference component and reliably suppress internal interference without causing an increase in size of the reception device regardless of a range in which the interference component is distributed. .

(Embodiment 2)
FIG. 5 is a front view showing a configuration of a receiving apparatus for explaining the second embodiment of the present invention, and FIG. 6 is a right side view showing a structure of the receiving apparatus for explaining the second embodiment of the present invention. FIG. 7 is a left side view showing the configuration of the receiving apparatus for explaining the embodiment of the present invention.

  5, 6, and 7, the same portions as those in FIGS. 1, 2, 3, and 4 described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the second embodiment, a portable receiving apparatus having a foldable structure will be described as an example of the receiving apparatus.

  As shown in FIGS. 5, 6, and 7, the receiving device 200 is rotatably connected to the upper housing 201 b by hinges 207 a and 207 b and an upper housing 201 b as an example of a first housing. In addition, a lower casing 201a as an example of the second casing is provided, and two states, an open state and a closed state, can be taken by rotating about the hinge portions 207a and 207b. Note that the lower casing 201a and the upper casing 201b are formed of a resin molded product which is an insulator.

  A metal frame 202 and a noise detection antenna element 106 are provided inside the upper housing 201b.

  The metal frame 202 is made of a highly conductive metal that is light and strong (for example, a magnesium alloy). By using this type of metal, it is possible to make the upper casing 201b thin and secure the strength, and to operate the metal frame 202 as an antenna element.

  A circuit board 102 is provided inside the lower casing 201a. The circuit board 102 includes a main antenna matching circuit 104, a main antenna grounding point 105, a noise detection antenna matching circuit 107, a noise detection antenna grounding point 108, a variable gain. A phase circuit 109, an adding circuit 110, a receiving circuit 111, a CPU 112, a signal line 114, and a display element 115 are provided.

  The circuit board 102 is a printed board on which circuit components that realize various functions of the receiving device 200 are mounted, and a ground pattern (not shown) serving as a circuit ground potential is formed on almost the entire surface of the circuit board 102.

  The hinge portion 207a has a hinge fitting 205b attached to the upper casing 201b, a 205a attached to the lower casing 201a, and a rotating shaft 204a for rotatably connecting the hinge fitting 205a and the hinge fitting 205b. Configured.

  A screw hole for attachment to the upper housing 210b is formed in the lower part (−Z direction) of the metal frame 202, and the hinge fitting 205b also corresponds to the screw hole formed in the metal frame 202. Screw holes are drilled in.

  The attachment screw 206a is attached to the screw hole portion 209b of the upper housing 201b via the metal frame 202 and the hinge fitting 205b.

  With this configuration, the metal frame 202 and the hinge fitting 205b are electrically connected, and the upper casing 201b, the hinge fitting 205b, and the metal frame 202 are mechanically fixed.

  The hinge fitting 205b is further rotatably connected to the hinge fitting 205a via a rotating shaft 204a. The hinge fittings 205a and 205b and the rotating shaft 204a are made of a conductive metal, and are electrically connected at a contact point between them.

  The hinge fitting 205a has a screw hole for attachment to the lower housing 201a, and the power supply terminal 113a also has a screw hole. The attachment screw 206a is attached to the screw hole portion 209a of the lower casing 201a through the screw hole of the hinge fitting 205a and the screw hole of the power supply terminal 113a. With this configuration, the hinge metal fitting 205a and the power supply terminal 113a are electrically connected, and the lower casing 201a, the hinge metal fitting 205a, and the power supply terminal 113a are mechanically fixed.

  The power supply terminal 113a is connected to the main antenna matching circuit 104 on the circuit board 102 disposed inside the lower housing 201 by, for example, spring contact or soldering.

  The hinge portion 207b includes a rotation shaft 204b for rotatably connecting the upper housing 201b and the lower housing 201a.

  The rotating shaft 204b is, for example, a resin molded product that is an insulator, and has a cylindrical shape with a hollow inside.

  The upper housing 201b and the lower housing 201a can be rotated around the rotation shafts 204a and 204b, and can be in two states, an open state and a closed state.

  The power feeding cable 208 is connected to the noise detection antenna element 106 provided on the upper housing 201b side, passes through the cavity of the rotating shaft 204b, and matches the noise detection antenna on the circuit board 102 provided on the lower housing 201a side. Connected to the circuit 107. For example, a coaxial cable is used as the power supply cable 208, and is connected to the noise detection antenna element via, for example, a spring contact, soldering, or cable fitting connector, and is connected to the noise detection antenna matching circuit 107, for example, a spring. They are connected via contacts, soldering, and cable fitting connectors.

With this configuration, the metal frame 202 and hinge portion 207a provided on the upper housing 201b and the ground pattern on the circuit board 102 provided on the lower housing 201a operate as a dipole antenna. At this time, the metal frame 202 and the hinge portion 207a operate as the first antenna element, and the main antenna matching circuit 104 matches the impedance of the first antenna element with the input impedance (for example, 50Ω) of the adder circuit 110. Let On the other hand, the ground pattern on the circuit board 102 operates as a second antenna element.
The receiving device 200 receives a received signal by the main antenna using the entire casing by the first and second antenna elements.

  An example of a configuration that operates as a dipole antenna using the first and second antenna elements as described above is disclosed in Japanese Patent No. 3596774.

  The noise detection sensor 106 is disposed on the upper casing 201b side, operates as a third antenna element, and has a printed pattern on a conductor plate, a conductive wire, or a printed board disposed in the upper casing 201b. It may be formed. The noise detection antenna element 106 that is the third antenna element and the ground pattern on the circuit board 102 that is the second antenna element operate as a dipole antenna, and a noise source that uses the ground of the circuit board 102 as the ground potential A noise signal 116 radiated by a circuit such as the CPU 112 is received.

  As shown in FIG. 5, the feeding position of the first and second antenna elements, for example, the feeding position of the noise detection antenna element 106, for example, the distance L2 between the feeding terminal 113b of the noise detecting antenna element 106 is the first and second. The noise detection antenna performance is configured to be within a quarter of the wavelength of the reception operating frequency band of the main antenna formed by the two antenna elements (for example, within 94 mm when used in the reception frequency 800 MHz band). Desirable above. Further, as shown in FIG. 5, the feeding positions of the first and second antenna elements, for example, the feeding position of the feeding terminal 13a and the feeding position of the noise detection antenna element 106, for example, the feeding terminal 113b, are as shown in FIG. It is good also as a structure arrange | positioned on the same side on the circuit board 102. FIG.

  In the receiving apparatus configured as described above, the noise detection antenna 106 fed unbalanced to the ground portion of the circuit board 102 is a noise source that generates an interference component having the ground pattern of the circuit board 102 as a ground potential. It is possible to efficiently detect a noise signal 116 radiated by a circuit such as the CPU 112. As described above, according to the present embodiment, it is possible to efficiently detect an interference component and reliably suppress internal interference without causing an increase in size of the reception device regardless of a range in which the interference component is distributed. .

  In the present embodiment, the CPU 112 is described as an example of a noise source. However, the noise source is a circuit having a ground portion of the circuit board 102 as a ground potential, for example, a memory circuit holding a video signal, DC / DC, or the like. There may be a power supply circuit such as a power supply or a signal processing circuit such as a liquid crystal display. Further, the noise source is not limited to a circuit mounted on the circuit board 102, but may be a circuit having a ground part that is electrically connected to the ground part of the circuit board 102 other than the circuit board 102. Even in this case, the same effect can be obtained by adopting the same configuration as described above.

  In the present embodiment, the power supply cable 208 is taken as an example as the power supply line of the noise detection antenna element 106. However, even if the power supply cable 208 is not in the form of a cable, the noise detection antenna 106 and the noise detection antenna matching circuit are electrically connected. Similar effects can be obtained even with a hinged part formed of a conductive metal, for example, a conductive metal.

  The receiving device according to the present invention is useful for terminal devices such as a mobile phone, a personal computer, a television receiver, and a PDA.

100, 200 Receiver 101 Case 102 Circuit board 103 Main antenna element 104 Main antenna matching circuit 105 Main antenna matching circuit ground point 106, 301 Noise detection antenna element 107 Noise detection antenna matching circuit 108 Noise detection antenna matching circuit ground point 109 Variable Gain phase circuit 110 Addition circuit 111 Reception circuit 112 CPU
113, 113a, 113b Feed terminal 114 Signal line 115 Display element 116 Noise signal 117 Grounding terminal 201a Lower casing 201b Upper casing 202 Metal frame 204a, 204b Rotating shaft 205a, 205b Hinge fittings 206a, 206b Mounting screws 207a, 207b Hinge Port 208 Cable 209a, 209b Screw hole 210 Switch 211 Impedance element 212 Control circuit 213 Matching circuit grounding point 300 Conventional receiver

Claims (1)

Provided in the first casing, a first casing, a second casing, a conductive hinge part that rotatably connects the first casing and the second casing, and the first casing A metal frame, a circuit board provided in the second housing and having a ground pattern, a main antenna element for supplying unbalanced power from the ground pattern of the circuit board to the metal frame via the hinge, A first power feeding unit that feeds power from the circuit board to the hinge unit, a receiving circuit that demodulates a signal received by the main antenna element, a noise signal circuit disposed on the circuit board, and noise generated from the noise signal circuit A phase / amplitude adjustment circuit that adjusts the amplitude and phase of the signal and superimposes it on the signal received by the main antenna element, and noise that is fed unbalanced from the ground pattern of the circuit board as means for detecting the noise signal And leaving the antenna element, a second feeding section for feeding from said circuit board to said noise detection antenna elements, receiving device characterized by supplying power to said noise detection antenna to the main antenna element from the circuit board.

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