JP2011041171A - Radio communication terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication terminal capable of dealing with radio communication systems having different operating frequencies respectively by one antenna element. <P>SOLUTION: The radio communication terminal is constituted such that second and fourth cutoff portions 101 and 103 for cutting off a first frequency band are connected by a second conductive element 11 and first and third cutoff portions 100 and 102 are connected by a first conductive element 10. Thereby, each antenna open end viewed from a first radio system 4 and a second radio system 5 is made to be on an antenna element 1, and good antenna performance can be obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless communication terminal such as a cellular phone or a PHS (Personal Handy-Phone System).

  Wireless communication terminals such as mobile phones and PHS need to be compatible with wireless systems of various operating frequencies, while the mainstream is to incorporate an antenna element in the wireless communication terminal for thinness and miniaturization. As described above, it is necessary to arrange antenna elements corresponding to various operating frequencies in a limited space. Accordingly, when a plurality of antenna elements are arranged, the antenna elements are spatially electromagnetically coupled, and the antenna performance is deteriorated.

  As a means for avoiding the deterioration of the antenna performance due to the electromagnetic coupling, for example, there is a technique disclosed in Patent Document 1 that increases the antenna isolation performance by separating the distance between the antenna elements. As shown in FIG. 10, the antenna element 301 and the antenna element 302 are arranged so as to be distant from each other even when the housing is closed or opened, thereby improving the isolation performance between the elements and suppressing the deterioration of the antenna characteristics. Yes.

  In order to avoid the deterioration of antenna performance due to the electromagnetic coupling, there is a method for dealing with various operating frequencies with one antenna element. However, in that case, it is necessary to widen the antenna element.

  For example, Japanese Patent Application Laid-Open No. 2004-228688 discloses a technique of “feeding power from both ends of one antenna element to switch a matching circuit”. As shown in FIG. 11, each power feeding unit and matching circuit are provided at both ends of the antenna element 303, and the connection of the elements is switched by the band changeover switch 304, thereby supporting a plurality of wireless systems having different operating frequencies.

JP 2005-277703 A JP 2006-310995 A

  However, the wireless communication terminals described in Patent Document 1 and Patent Document 2 have a problem that good antenna characteristics cannot be obtained when wireless systems having various operating frequencies are operated simultaneously.

  For example, when the antennas of the first radio system and the second radio system are provided, the space where the antenna can be arranged is limited due to the miniaturization / thinning and high functionality of the radio communication terminal, and the distance is sufficiently separated. Cannot be placed. Therefore, the isolation performance between antennas deteriorates, and the antenna performance decreases due to electromagnetic coupling.

  Therefore, the influence of electromagnetic coupling can be eliminated by configuring the first radio system and the second radio system with one antenna element.

  However, in order to handle a plurality of frequencies with one antenna element, it is necessary to increase the bandwidth.

  Therefore, a matching circuit for setting the resonance frequency of the antenna to each radio system operating frequency is provided at both ends of the antenna element, and the connection between the matching circuit and the radio unit can be switched. The system cannot be operated simultaneously. Further, when a connection portion for switching the connection with the wireless portion is provided on the circuit board, the open end of the antenna element is on the circuit board, and the radiation resistance decreases due to the proximity of the ground pattern on the circuit board, and the antenna characteristics deteriorate.

  The present invention has been made in view of such circumstances, and provides a wireless communication terminal in which one antenna element is fed from a wireless system having different operating frequencies, and a plurality of wireless systems can be operated simultaneously, and antenna performance is good. The purpose is to provide.

  In order to achieve the above object, a wireless communication terminal according to the present invention is a wireless communication terminal equipped with a plurality of wireless systems having different operating frequencies, the first wireless system using the first frequency band as the operating frequency, and the first frequency band. A second radio system having a second frequency band different from the operating frequency, a circuit board on which the first radio system and the second radio system are mounted, and an antenna disposed at a predetermined distance from the circuit board An element, a first blocking unit electrically connected to the antenna element and disposed on the antenna element to block the second frequency band, and a first conductor element electrically connected to the first blocking unit A third blocking unit electrically connected to the first conductor element and the first wireless system and disposed on the circuit board for blocking the second frequency band; and electrically connected to the antenna element. A second blocking unit disposed at a position different from the first blocking unit on the antenna element and blocking the first frequency band; a second conductor element electrically connected to the second blocking unit; A fourth blocking unit that is electrically connected to the second conductor element and the second wireless system and is disposed on the circuit board and blocks the first frequency band;

  According to the above configuration, the antenna element and the first conductor element operate as the antenna for the first wireless system, the antenna element and the second conductor element operate as the antenna for the second wireless system, Each wireless system can operate independently and simultaneously.

  In the above configuration, the first frequency band is higher than the second frequency band, and an interval between the lowest frequency of the first frequency band and the highest frequency of the second frequency band is the first frequency. The ratio band is 5% or more with respect to the center frequency of the band.

  According to the said structure, a 1st cutoff part and a 3rd cutoff part can pass a 1st frequency band, and can interrupt | block a 2nd frequency band. Similarly, the second blocking unit and the fourth blocking unit pass the second frequency band and can block the first frequency band, and the connection from each radio system to the antenna element is lost in the frequency band used by the radio system. Can be done without.

  Moreover, the said structure WHEREIN: The space | interval of a said 3rd cutoff part and a said 4th cutoff part is more than 1/20 wavelength of a 1st frequency band or a 2nd frequency band.

  According to the above configuration, current flow between the third blocking unit and the fourth blocking unit is suppressed, and power from each wireless system can be supplied only to the antenna element, so that good antenna performance is achieved. Obtainable.

In the above configuration, the length of the first conductor portion is 1/8 wavelength or less of the second frequency band,
The length of the second conductor portion is 1/8 wavelength or less of the first frequency band.

  According to the above configuration, since the first conductor element does not resonate in the second frequency band and the second conductor element does not resonate in the first frequency band, the antenna element and the first antenna are used as the antenna for the first wireless system. The first conductor element operates and the second conductor element does not affect the antenna for the first radio system, and the antenna element and the second conductor element operate as the antenna for the second radio system, and the first conductor Since the element does not affect the antenna for the second radio system, good antenna performance can be obtained in each radio system.

  According to the present invention, it is possible to cope with wireless systems having different operating frequencies with one antenna element, and the wireless systems can operate at the same time. Therefore, it is possible to reduce the size and thickness of wireless communication terminals compatible with a plurality of wireless systems. I can plan.

The figure for demonstrating schematic structure of the radio | wireless communication terminal which concerns on embodiment of this invention The block diagram which shows schematic structure of the radio | wireless communication terminal which concerns on embodiment of this invention Schematic diagram of operation states in the first frequency band and the second frequency band of the wireless communication terminal according to the embodiment of the present invention The figure for demonstrating the 1st interruption | blocking part of the radio | wireless communication terminal which concerns on embodiment of this invention The figure for demonstrating the 1st conductor element of the radio | wireless communication terminal which concerns on embodiment of this invention The figure for demonstrating the 3rd interruption | blocking part of the radio | wireless communication terminal which concerns on embodiment of this invention The figure for demonstrating the 2nd interruption | blocking part of the radio | wireless communication terminal which concerns on embodiment of this invention The figure for demonstrating the 2nd conductor element of the radio | wireless communication terminal which concerns on embodiment of this invention The figure for demonstrating the 4th interruption | blocking part of the radio | wireless communication terminal which concerns on embodiment of this invention The figure which shows the general view of the conventional radio | wireless communication terminal which reduces electromagnetic coupling degradation The figure which shows the general view of the radio | wireless communication terminal which aims at a broadband by one conventional element.

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

(Embodiment)
FIG. 1 is a configuration diagram of a radio communication terminal 200 according to an embodiment of the present invention. 2 is a conceptual diagram of the wireless communication terminal 200 according to the present embodiment, where (a) is a block diagram and (b) is a perspective view. FIG. 3 is a diagram schematically showing operation modes at each operating frequency in radio communication terminal 200 according to the present embodiment, and (a) is a diagram showing antenna operation in second radio system 5. FIG. 6B is a diagram illustrating antenna operation in the first wireless system 4.

  1 to 3, the wireless communication terminal 200 according to the present embodiment includes a circuit board 20 and an antenna board 21.

  On the circuit board 20, a first wireless system 4 having an operating frequency in the first frequency band, a third blocking unit 102 electrically connected to the first wireless system 4 and the first conductor element 10, a first A second wireless system 5 arranged at a position different from the wireless system 4 and having the second frequency band as an operating frequency, and a fourth blocking unit 103 electrically connected to the second wireless system 5 and the second conductor element 11. Have.

  On the antenna substrate 21, the antenna element 1, the first blocking part 100 electrically connected to the antenna element 1, and the first blocking part 100 electrically connected to the antenna element 1 at a position different from the first blocking part 100 are provided. 2 having a blocking unit 101.

  The first conductor element 10 on the circuit board 20 is electrically connected to the first blocking part 100 on the antenna board 21, and the second conductor element 11 on the circuit board 20 is connected to the second blocking part on the antenna board 21. 101 is electrically connected.

  In the above configuration, for example, the first wireless system 4 is Bluetooth (registered trademark) having a first frequency band of 2.4 GHz, and the second wireless system 5 is a GPS having a second frequency band of 1.5 GHz. In some cases, the effects of the present invention will be described in detail.

  First, the configuration of each block will be described in detail. FIG. 4 is a diagram illustrating an example of a specific configuration of the first blocking unit 100 in the wireless communication terminal 200 according to the present embodiment.

  The first blocking unit 100 is configured on the antenna substrate 21, and is blocked at a position different from the blocking circuit 30, the connecting unit 32, the line 31 that electrically connects the connecting unit 32 and the blocking circuit 30, and the line 31. The line 33 is electrically connected to the circuit 30.

  The cutoff circuit 30 has a circuit configuration that blocks the 1.5 GHz band that is the second frequency band and passes the 2.4 GHz band that is the first frequency band. For example, it is configured by a band-pass circuit that passes 2.4 GHz (cuts off the 1.5 GHz band) or a frequency cut-off circuit that cuts off the 1.5 GHz band (passes through the 2.5 GHz band).

  With the above configuration, the first blocking unit 100 can block the 1.5 GHz band, which is the second frequency band, of the flowing high-frequency current, and pass the 2.4 GHz band, which is the first frequency band.

  FIG. 5 is a diagram illustrating an example of a specific configuration of the first conductor element 10 in the wireless communication terminal 200 of the present embodiment, a perspective view illustrating the arrangement relationship of the components of the first conductor element 10, It is comprised by the side view which shows the connection relation of the component of the conductor element 10. FIG.

  The 1st conductor element 10 is arrange | positioned on the circuit board 20, and is comprised with conductors, such as a metal made from a spring. The electrical length of the first conductor element 10 is configured to be 1 / 8λ or less of the second frequency band 1.5 GHz.

  With the above configuration, the length of the first conductor element 10 becomes a length that does not operate as an antenna in the second frequency band 1.5 GHz band, and does not affect the performance due to the proximity to the antenna element 1. In the first frequency band 2.4 GHz band, a high-frequency current can be passed without loss as a transmission line.

  FIG. 6 is a diagram illustrating an example of a specific configuration of the third blocking unit 102 in the wireless communication terminal 200 of the present embodiment.

  The third cutoff unit 102 is configured on the circuit board 20, and is electrically connected to the cutoff circuit 50 at a position different from the cutoff circuit 50, the line 51 electrically connected to the cutoff circuit 50, and the line 51. The track 52 is configured.

  The cutoff circuit 50 has a circuit configuration that blocks the 1.5 GHz band that is the second frequency band and passes the 2.4 GHz band that is the first frequency band. For example, it is configured by a band-pass circuit that passes 2.4 GHz (cuts off the 1.5 GHz band) or a frequency cut-off circuit that cuts off the 1.5 GHz band (passes through the 2.4 GHz band).

  With the above configuration, the third blocking unit 102 can block the 1.5 GHz band, which is the second frequency band, of the flowing high-frequency current, and pass the 2.4 GHz band, which is the first frequency band.

  FIG. 7 is a diagram showing the second blocking unit 101 in the wireless communication terminal 200 of the present embodiment.

  The second blocking unit 101 is configured on the antenna substrate 21 and is blocked at a position different from the blocking circuit 40, the connecting unit 42, the line 41 that electrically connects the connecting unit 42 and the blocking circuit 40, and the line 41. The line 43 is electrically connected to the circuit 40.

  The cut-off circuit 40 has a circuit configuration that cuts off the 2.4 GHz band that is the first frequency band and passes the 1.5 GHz band that is the second frequency band. For example, it is configured by a band-pass circuit that passes 1.5 GHz (cuts off the 2.4 GHz band) or a frequency cut-off circuit that cuts off the 2.4 GHz band (passes the 1.5 GHz band).

  With the above configuration, the second blocking unit 101 can block the 2.4 GHz band, which is the first frequency band, of the flowing high-frequency current, and allow the 1.5 GHz band, which is the second frequency band, to pass through.

  FIG. 8 is a diagram illustrating an example of a specific configuration of the second conductor element 11 in the wireless communication terminal 200 of the present embodiment, a perspective view illustrating the arrangement relationship of the components of the second conductor element 11, It is comprised by the side view which shows the connection relation of the component of the conductor element 11. FIG.

  The 2nd conductor element 11 is arrange | positioned on the circuit board 20, and is comprised with conductors, such as a metal made from spring. The electrical length of the second conductor element 11 is configured to be 1 / 8λ or less of the first frequency band 2.4 GHz.

  With the above configuration, the length of the second conductor element 11 is a length that does not operate as an antenna in the first frequency band 2.4 GHz band, and does not affect the performance due to the proximity to the antenna element 1. Moreover, in the second frequency band 1.5 GHz band, a high-frequency current can be passed without loss as a transmission line.

  FIG. 9 is a diagram illustrating an example of a specific configuration of the second conductor element 11 in the wireless communication terminal 200 according to the present embodiment.

  The fourth cutoff unit 103 is configured on the circuit board 20, and is electrically connected to the cutoff circuit 60 at a position different from the cutoff circuit 60, the line 61 electrically connected to the cutoff circuit 60, and the line 61. The track 62 is configured.

  The cutoff circuit 60 has a circuit configuration that blocks the 2.4 GHz band that is the first frequency band and passes the 1.5 GHz band that is the second frequency band. For example, it is configured by a band-pass circuit that passes 1.5 GHz (cuts off the 2.4 GHz band) or a frequency cut-off circuit that cuts off the 2.4 GHz band (passes the 1.5 GHz band).

  With the above configuration, the fourth blocking unit 103 can block the 2.4 GHz band, which is the first frequency band, of the flowing high-frequency current, and allow the 1.5 GHz band, which is the second frequency band, to pass through.

  Next, the electrical connection of the said structure is demonstrated.

  The first wireless system 4 and the third blocking unit 102 are connected via a line 51 on the third blocking unit 102, and the third blocking unit 102 and the first conductor element 10 are connected to a line 52 on the third blocking unit 102. Connected through. In addition, the first conductor element 10 and the first blocking unit 100 are connected via the connection unit 32 on the first blocking unit 100, and the first blocking unit 100 and the antenna element 1 are connected to the line on the first blocking unit 100. 33 is connected.

  Similarly, the second wireless system 5 and the fourth blocking unit 103 are connected via a line 61 on the fourth blocking unit 103, and the fourth blocking unit 103 and the second conductor element 11 are connected on the fourth blocking unit 103. Are connected via a line 62. In addition, the second conductor element 11 and the second blocking unit 101 are connected via the connection unit 42 on the second blocking unit 101, and the second blocking unit 101 and the antenna element 1 are connected to the line on the second blocking unit 101. 43 is connected.

  The power supplied from the first wireless system 4 by the connection flows to the antenna element 1, and similarly, the power supplied from the second wireless system 5 flows to the antenna element 1.

  Next, the antenna operation in each wireless system having the above configuration will be described.

  In the second frequency band 1.5 GHz band used by the second radio system 5, high-frequency current flowing from the second radio system 5 flows through the fourth cutoff unit 103, the second conductor element 11, and the second cutoff unit 101 without loss. It is supplied to the element 1. In addition, since the first blocking unit 100 blocks the second frequency band of 1.5 GHz, no high-frequency current flows from the antenna element 1 to the first blocking unit 100. And since the 3rd interruption | blocking part 102 also interrupts | blocks the 2nd frequency band 1.5GHz band, the 1st conductor element 10 will be in the state isolate | separated in high frequency, and the 1st conductor element 10 will be in the 2nd frequency band 1. Since the length is 1 / 8λ or less of the 5 GHz band, even if it is close to the antenna element 1 without resonating as an antenna, the antenna performance is not affected.

  Therefore, when the antenna element 1 and the first wireless system 4 are connected via the first conductor element 10 without the first blocking unit 100 and the third blocking unit 102, the antenna open end is not provided for the second wireless system 5. Although the antenna performance is deteriorated close to the GND pattern of the circuit board 20, the antenna open end viewed from the second radio system 5 in the second frequency band 1.5 GHz can be set on the antenna element 1 by the above configuration. Good antenna performance can be obtained. In addition, since a high-frequency current in the second frequency band 1.5 GHz does not flow from the second cutoff unit 101 to the fourth cutoff unit 103, the second frequency band 1.5 GHz between the second radio system 5 and the first radio system 4 is used. The isolation performance in the band can be improved. The above is schematically shown in FIG.

  Similarly, in the first frequency band 2.4 GHz band used by the first radio system 4, the high-frequency current flowing from the first radio system 4 passes through the third cutoff unit 102, the first conductor element 10, and the first cutoff unit 100. The flow is supplied to the antenna element 1 without loss. Further, since the second blocking unit 101 blocks the first frequency band 2.4 GHz band, no high frequency current flows from the antenna element 1 to the second blocking unit 101. And since the 4th interruption | blocking part 103 also interrupts | blocks the 1st frequency band 2.4GHz band, the 2nd conductor element 11 will be in the state isolate | separated in high frequency, and the 2nd conductor element 11 is 1st frequency band 2. Since the length is 1 / 8λ or less of the 4 GHz band, even if it is close to the antenna element 1 without resonating as an antenna, the antenna performance is not affected.

  Therefore, when the antenna element 1 and the second wireless system 5 are connected via the second conductor element 11 without the second blocking part 101 and the fourth blocking part 103, the antenna open end is not provided for the first wireless system 4. Although the antenna performance deteriorates in proximity to the GND pattern of the circuit board 20, the antenna open end viewed from the first wireless system 4 in the first frequency band 2.4 GHz can be on the antenna element 1 by the above configuration, Good antenna performance can be obtained. In addition, since a high-frequency current in the first frequency band 2.4 GHz band does not flow from the second cutoff unit 101 to the fourth cutoff unit 103, the first frequency band 2.4 GHz between the first radio system 4 and the second radio system 5. The isolation performance in the band can be improved. FIG. 3B schematically shows the above.

  As described above, according to the radio communication terminal 200 of the present embodiment, it is possible to deal with radio systems having different operating frequencies with one antenna element, and to obtain good antenna performance for each radio system. In addition, the wireless system can operate simultaneously, and the wireless communication terminal 200 compatible with a plurality of wireless systems can be reduced in size and thickness.

  In the present embodiment, the first frequency band is higher than the second frequency band, and an interval between the lowest frequency of the first frequency band and the highest frequency of the second frequency band is first. The ratio band is 5% or more with respect to the center frequency of one frequency band. With the above configuration, the first cutoff unit and the third cutoff unit can pass the first frequency band and block the second frequency band. Similarly, the second blocking unit and the fourth blocking unit pass the second frequency band and can block the first frequency band, and the connection from each radio system to the antenna element is lost in the frequency band used by the radio system. Can be done without.

  Similarly, in the present embodiment, the distance between the third cutoff unit and the fourth cutoff unit is 1/20 wavelength or more of the first frequency band or the second frequency band. With the above configuration, it is possible to suppress the flow of current between the third blocking unit and the fourth blocking unit, and to supply power from each wireless system only to the antenna element, thereby obtaining good antenna performance. Can do.

  In the present embodiment, the first frequency band is the 2.4 GHz band and the second frequency band is the 1.5 GHz band. However, the present invention is not limited to this, and it is assumed that the first frequency band corresponds to various wireless systems.

  Thin and compact wireless communication terminal equipped with multiple wireless systems, with the effect that one antenna element can support wireless systems with different operating frequencies, and can obtain good antenna performance for each wireless system. It is possible to adapt to.

DESCRIPTION OF SYMBOLS 1 Antenna element 4 1st radio | wireless system 5 2nd radio | wireless system 10 1st conductor element 11 2nd conductor element 20 Circuit board 21 Antenna board 30 Cutoff circuit 31 of the 1st cutoff part 31, 33 Line of the 1st cutoff part 32 1st cutoff Connection part of part 40 Blocking circuit of second blocking part 41, 43 Line of second blocking part 42 Connection part of second blocking part 50 Blocking circuit of third blocking part 51, 52 Line of third blocking part 60 Fourth blocking Block circuit 61, 62 line of fourth block unit 100 first block unit 101 second block unit 102 third block unit 103 fourth block unit 200 wireless communication terminal 301 antenna element 1 of Patent Document 1
302 Antenna element 2 of Patent Document 1
303 Antenna Element of Patent Document 2 304 Band Change Switch of Patent Document 2

Claims (4)

In wireless communication terminals equipped with multiple wireless systems with different operating frequencies,
A first wireless system having an operating frequency in the first frequency band;
A second wireless system having an operating frequency in a second frequency band different from the first frequency band;
A circuit board on which the first wireless system and the second wireless system are mounted;
An antenna element disposed at a predetermined distance from the circuit board;
A first blocking unit that blocks the second frequency band electrically connected to the antenna element;
A second blocking unit that blocks the first frequency band electrically connected at a position different from the first blocking unit of the antenna element;
An antenna substrate on which the antenna element, the first blocking portion, and the second blocking portion are mounted;
A first conductor element electrically connected to the first blocking portion;
A third blocking unit that is electrically connected to the first conductor element and the first wireless system and is disposed on the circuit board and blocks the second frequency band;
A second conductor element electrically connected to the second blocking portion;
A fourth blocking unit that is electrically connected to the second conductor element and the second wireless system and is disposed on the circuit board and blocks the first frequency band;
The antenna element and the first conductor element operate as an antenna for the first wireless system,
The radio communication terminal, wherein the antenna element and the second conductor element operate as an antenna for the second radio system. The first frequency band is a lower frequency than the second frequency band,
The distance between the highest frequency in the first frequency band and the lowest frequency in the second frequency band is 5% or more of the ratio band with respect to the center frequency of the first frequency band. The wireless communication terminal described. The wireless communication according to claim 1 or 2, wherein an interval between the third blocking unit and the fourth blocking unit is 1/20 wavelength or more of the first frequency band or the second frequency band. Terminal. A length of the first conductor portion is 1/8 wavelength or less of the second frequency band;
The wireless communication terminal according to any one of claims 1 to 3, wherein a length of the second conductor portion is 1/8 wavelength or less of the first frequency band.

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