JP4565305B2 - Portable wireless terminal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a portable wireless terminal device, and is suitable for application to, for example, a portable telephone adapted to support two types of wireless communication systems having different wireless communication frequencies.
[0002]
[Prior art]
In recent years, with the rapid spread of mobile phones, the number of lines in one wireless communication system tends to be insufficient. For this reason, in mobile phones, it is considered to secure the necessary number of lines in combination with other wireless communication systems using different frequency bands, and two types of wireless communication systems are provided with one mobile phone. The terminal which can use is developed.
[0003]
Such mobile phones include two wireless communication systems, a PDC (Personal Digital Celluler) using the 800 [MHz] band and a PHS (Personal Handyphone System) using the 1.9 [GHz] band, and a 900 [MHz] band. Two wireless communication systems, GSM (Global System for Mobile communication) and DCS (Digital Communication System) using 1.8 [GHz] band, and AMPS (Advanced Mobile phone Service) using 800 [MHz] band And two wireless communication systems such as PCS (Personal Communications Services) using the 1.9 [GHz] band.
[0004]
In practice, for example, as shown in FIG. 7, the antenna device 1 provided in the case of the cellular phone includes a rectangular radiating conductor plate 3, a ground conductor plate 4, and a rectangular radiating conductor plate 3 and a ground conductor plate 4. A first radiating conductor plate that is divided into two by a slit formed in a substantially central portion of the rectangular radiating conductor plate 3. Capacitors C1 and C2 are connected between 3A and the second radiation conductor plate 3B and the ground conductor plate 4 which is a circuit board, respectively.
[0005]
Then, the cellular phone 1 adjusts via the capacitors C1 and C2 so that the first radiating conductor plate 3A and the second radiating conductor plate 3B resonate at different first and second radio communication frequencies, respectively. Has been made to work as.
[0006]
[Problems to be solved by the invention]
By the way, in the mobile phone 1 having such a configuration, by providing the capacitors C1 and C2 between the radiation conductor plate 3 and the ground conductor plate 4, electromagnetic waves generated from the capacitors C1 and C2 are applied to the rectangular radiation conductor plate 3. The rectangular radiation conductor plate 3 operating as an antenna is stabilized by receiving a large amount of electromagnetic waves generated from various circuit components in the casing case due to the large area of the rectangular radiation conductor plate 3. It was still insufficient to obtain the electrical characteristics.
[0007]
The present invention has been made in consideration of the above points, and an object of the present invention is to propose a portable wireless terminal device that can further stabilize the electrical characteristics.
[0008]
[Means for Solving the Problems]
This onset bright order to solve such a problem, a mobile wireless terminal apparatus, a housing case, with respect to the surface of the housing case, and a connector having a surface on which the cable is connected, the resonance in the first frequency And a second antenna element that resonates at a second frequency different from the first antenna element . The first antenna element and the second antenna element are linear, and an intermediate portion thereof is formed in a spiral shape along a non-conductive cylindrical support column located in the vicinity of the connector in the housing case. The tip portion is formed on a non-conductive plane in the connector.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0010]
In FIG. 1, reference numeral 10 denotes a cellular phone according to the present invention as a whole. A front surface 11C of a housing case 11 formed by combining an upper case half 11A and a lower case half 11B has a liquid crystal panel 12 and A plurality of operation keys 13 are provided.
[0011]
A rod antenna 14 having an antenna element formed in a rod shape with a conductive wire rod is disposed on the upper end surface 11D of the housing case 11 so as to be extendable and contracted, and the lower end surface 11E is externally connected via a predetermined cable. A connector 15 for connecting to the device is provided.
[0012]
As shown in FIG. 2, the connector 15 has a substantially T shape, and a part of the facing surface 15B that faces the connecting surface 15A for connecting the cable approximately 90 degrees is fixed to the circuit board 16 provided in the housing case 11. Then, the connection surface 15 </ b> A is stored in the housing case 11 in a state where the connection surface 15 </ b> A is exposed from the housing case 11.
[0013]
The connector 15 is formed in a spiral shape having a pitch width LA1 of equal intervals by a conductive wire in a state along the thickness direction of the substantially right-angle side surface 15C, and is opposed to the front surface 11C of the housing case 11 by approximately 90 degrees. A first antenna element 17 formed in a meander shape having an equal pitch width LA2 in a state along the width direction of the top surface 15E is disposed.
[0014]
In addition, the connector 15 is formed in a spiral shape having a pitch width LA1 at equal intervals by a conductive wire in a state along the thickness direction of the substantially right side surface 15D, and is equidistant in a state along the width direction of the top surface 15E. A second antenna element 18 having a meander shape having a pitch width LA2 is provided.
[0015]
In the case of this embodiment, a non-conductive screw for combining the upper case half 11A and the lower case half 11B in the space between the substantially right-angle side faces 15C and 15D of the connector 15 and the circuit board 16 is provided. Stopping struts (not shown) are respectively arranged. Accordingly, the first antenna element 17 and the second antenna element 18 have the portions formed on the spirals inserted through the screwing posts.
[0016]
One end of each of the first antenna element 17 and the second antenna element 18 is soldered to the corresponding substrate contacts 19 and 20, and each feeder line (not shown) is connected from the substrate contacts 19 and 20. To a common power supply (not shown).
[0017]
The first antenna element 17 is selected so that the electrical length from the open end to the power feeding unit via the power feeding line is, for example, a wavelength λ / 4 of 1.8 [GHz] which is the first radio communication frequency. In addition, the second antenna element 18 is selected so that the electrical length from the open end to the power feeding unit via the power feeding line is, for example, a wavelength λ / 4 of 900 [MHz] which is the second radio communication frequency. Has been.
[0018]
Accordingly, the mobile phone 10 resonates at the first radio frequency when the first radio frequency (1.8 [GHz]) is used, and the second antenna element 18 having a long electrical length is at the first radio frequency. By not resonating, only the first antenna element 17 operates as an antenna. On the other hand, when the second radio frequency is used, the second antenna element 18 resonates at the second radio frequency (900 [MHz]) and the first antenna element 17 having a short electrical length is the second antenna element. Therefore, only the second antenna element 18 operates as an antenna.
[0019]
As described above, the cellular phone 10 includes the spirally formed portions of the first antenna element 17 and the second antenna element 18, the substantially right-angle side surfaces 15 </ b> C and 15 </ b> D of the nonconductive connector 15, the screw-supporting pillars, and the like. A portion formed in a meander shape and formed in a meander shape is formed on the top surface 15E of the non-conductive connector 15 that is separated from various circuit components on the circuit board 16, and the first antenna element 17 is also formed. By selecting different electrical lengths for the second antenna element 18, the antenna can be operated as an antenna with reduced noise generation due to electromagnetic waves generated in various circuit components in the housing case 11. Yes.
[0020]
As a result, the mobile phone 10 can obtain good antenna electrical characteristics, as is apparent from the standing wave ratio (VSWR) shown in FIG.
[0021]
The cellular phone 10 is configured such that the rod antenna 14 (FIG. 1) also resonates at the second radio communication frequency (900 [MHz]). The antenna element of the rod antenna 14 and the second antenna element 18 for diversity reception.
[0022]
In this case, in the mobile phone 10, the antenna element of the rod antenna 14 is disposed on the upper end surface 11 </ b> B (FIG. 1) side of the housing case 11, and the second antenna element 18 is on the lower end surface 11 </ b> C side of the housing case 11. It is arranged.
[0023]
That is, the mobile phone 10 is arranged such that the first antenna element 17 and the second antenna element 18 are arranged at the most distant positions, thereby reducing interference between the antenna elements 17 and 18 as much as possible. The electrical characteristics (to obtain a received signal with good quality) can be improved.
[0024]
Incidentally, the cellular phone 10 may resonate the rod antenna 14 (FIG. 1) at the first radio communication frequency (1.8 [GHz]).
[0025]
In the above configuration, the first radio communication frequency (1...) In a state along the substantially right side surface 15C and the top surface 15E of the connector 15 which is a non-conductive member provided in the housing case 11 of the mobile phone 10. 8 [GHz]), the first antenna element 17 is disposed, and the first antenna element 17 is positioned along the substantially right side surface 15D and the top surface 15E of the connector 15 at a position different from the first antenna element 17. The second antenna element 18 that resonates at a wireless communication frequency (900 [MHz]) of 2 is disposed.
[0026]
Accordingly, the cellular phone 10 avoids the connector 15 that is a non-conductive member from receiving the electromagnetic wave generated in the housing case 11, so that the first and the first disposed along the surface of the connector 15. The adverse effect of electromagnetic waves (such as noise generation) on the second antenna elements 17 and 18 can be reduced as compared with the conventional case.
[0027]
Further, the cellular phone 10 has a pitch width LA1 at equal intervals by a conductive wire in a state where the first antenna element 17 and the second antenna element 18 are along the thickness direction of the substantially right side surfaces 15C and 15D of the connector 15. It was formed in a spiral shape and a meander shape having a pitch width LA2 at equal intervals in a state along the width direction of the top surface 15E.
[0028]
Therefore, in the mobile phone 10, the first antenna 17 and the second antenna element 38 operate as antennas having different directivities in the spiral-shaped portion and the meander-shaped portion. In addition, the electrical characteristics of the antenna (obtaining a reception signal with good quality) can be further improved.
[0029]
In addition to this, the cellular phone 10 is provided in the space between the upper case half 11A and the top surface 15E of the connector 15 and the space between the substantially right side surfaces 15C and 15D of the connector 15 and the circuit board 16 as existing spaces. The antenna elements 17 and 18 are disposed, and the antenna elements 17 and 18 are formed in a state along the non-conductive connector 15 and the screwing support post. The space in the housing case 11 can be used effectively while maintaining good characteristics, and thus a significant reduction in size can be realized while maintaining good electrical characteristics.
[0030]
According to the above configuration, the first first antenna element 17 and the second antenna element 18 that resonate at different frequencies are connected to each other by the non-conductive member provided in the case 11 of the mobile phone 10. By disposing along the surface of a certain connector 15, it is possible to reduce adverse effects such as noise generation on the antenna elements 17, 18 due to electromagnetic waves generated in the housing case as compared with the conventional case. The characteristic can be further stabilized.
[0031]
In the above-described embodiment, the first antenna element 17 and the second antenna element 18 are equally spaced by the conductive wire in a state along the thickness direction of the substantially right side surfaces 15C and 15D of the connector 15. In the case of forming a spiral shape having a pitch width LA1 and a meander shape having a pitch width LA2 at equal intervals in a state along the width direction of the top surface 15E, the present invention is not limited to this. As shown in FIG. 4, the top surface 15 </ b> E of the connector 15 is formed after being formed into a spiral shape having a pitch width LA <b> 1 at equal intervals with a conductive wire in a state along the thickness direction of the substantially right side surfaces 15 </ b> C and 15 </ b> D of the connector 15. It is formed in a meander shape having a pitch width of equal intervals (FIG. 4 (A)), formed in a spiral shape (FIG. 4 (B)), a comb shape, a wedge shape, and a saw shape. Sinusoidal It may be formed on the non-linear such as a triangular wave.
[0032]
Moreover, after forming in the spiral shape which has the pitch width LA1 of equal intervals with the conductive wire in the state along the thickness direction of the substantially right-angle side surfaces 15C and 15D of the connector 15, in the state along the top surface 15E of the connector 15. It may be formed in a rectangular shape with a conductive plate or film (FIG. 4 (C)), provided with a slit in the rectangular shape (FIG. 4 (D)), or in a meander shape May be formed (FIG. 4E), or the first antenna element 17 and the second antenna element 18 may be formed in different shapes. The antenna element 17 and the second antenna element 18 can be formed.
[0033]
In this case, by changing the winding diameter, the number of turns, the pitch width of the first antenna element 17 and the second antenna element 18 or changing the position where the slit is provided, each antenna element 17, The electrical length can be changed in a state where 18 is provided.
[0034]
In particular, by changing the winding diameter, the number of turns, and the pitch width of the spirally formed portions in the first antenna element 17 and the second antenna element 18, the connector 15 does not depend on the thickness of the mobile phone 10. It is possible to arrange using only the surface space.
[0035]
In short, if the first antenna element 17 and the second antenna element 18 are formed in accordance with the shape of the connector 15 and the housing case 11 and further according to the radio frequency, the shape of the connector 15 and the housing case 11 will be described. In addition, it is possible to arrange using only the surface space of the connector 15 while maintaining good electrical characteristics without depending on the radio frequency.
[0036]
Further, in the above-described embodiment, the first antenna element 17 and the second antenna element 18 are equidistantly spaced by the conductive wire in a state along the thickness direction of the substantially right side surfaces 15C and 15D of the connector 15. The case of forming a spiral shape having a pitch width LA1 and forming a meander shape having a pitch width LA2 at equal intervals in a state along the width direction of the top surface 15E has been described, but the present invention is not limited to this. 5, the non-conductive portion provided so as to cover the connector pin (not shown) soldered to the circuit board 16 from the opposing surface 15B of the connector 15 as shown in FIG. The first antenna element 27 and the second antenna element 28 are formed in a spiral shape so that the winding diameter, the number of turns, and the pitch width are different from each other with a conductive wire in a state along the conductive member 25. It may be formed in a meander shape in a state along the depth direction of the top surface 15E of 15.
[0037]
Further, as shown in FIG. 6 in which the same reference numerals are assigned to the corresponding parts in FIG. 1 and FIG. 5, the second antenna element 38 is electrically conductive in a state along the thickness direction of the substantially right side surface 15D of the connector 15. After forming in a spiral shape with a wire, it may be formed in a meander shape in the width direction of the connector 15 along the non-conductive member 25 covering the facing surface 15E of the connector 15.
[0038]
In this case, in the mobile phone 10, the first antenna 17 and the second antenna element 38 operate as antennas having many directivities, so that the electrical characteristics of the antenna (obtaining received signals with good quality) are further improved. Can do.
[0039]
Further, in the above-described embodiment, the case where the first antenna element 17 and the second antenna element 18 are disposed in a state along the surface of the connector 15 as a nonconductive member has been described. However, the present invention is not limited to this, and a part of the first antenna element 17 and the second antenna element 18 may be arranged in contact with the surface of the connector 15.
[0040]
In this case, in the mobile phone 10, in the manufacturing process, the first antenna element 17 and the second antenna element 18 are previously in the first position so that the ends of the first antenna element 17 and the second antenna element 18 correspond to the substrate contacts 19 and 20 of the circuit board 16. If a part of the antenna element 17 and the second antenna element 18 are arranged in contact with the surface of the connector 15 and are arranged along the surface, the first connector 15 and the circuit board 16 are fixed when the connector 15 and the circuit board 16 are fixed. One end of each of the antenna element 17 and the second antenna element 18 is positioned at the board contacts 19 and 20 of the circuit board 16, respectively. Therefore, the board contacts 19 and 20, the first antenna element 17 and the second antenna The element 18 can be easily connected.
[0041]
Furthermore, in the above-described embodiment, the case where the first antenna element 17 and the second antenna element 18 are disposed along the surface of the connector 15 as a non-conductive member has been described. Not limited to this, a non-conductive member such as rubber or synthetic resin is provided in the housing case 11, and the first antenna element 17 and the second antenna element 18 are disposed along the surface of the non-conductive member. Also good.
[0042]
In this case, a non-conductive member is provided along the surface by selecting a place that is most unlikely to be affected by electromagnetic waves generated from various circuits and power feeding parts (for example, a place that is most distant from various circuits and power feeding parts). If the first antenna element 17 and the second antenna element 18 are disposed in the state, the first antenna element 17 and the second antenna element 18 are used as antennas with the most efficient electric characteristics in the housing case 11. It can be operated.
[0043]
Furthermore, in the above-described embodiment, the case where the present invention is applied to the mobile phone 10 as a mobile wireless terminal device has been described. However, the present invention is not limited to this, and for example, a transceiver or a PDA (Personal Digital Assistants with a communication function) added thereto. Furthermore, the present invention can be applied to various other portable wireless terminal devices such as a PC (Personal Computer) card.
[0044]
【The invention's effect】
As described above, according to the present invention, the first antenna element that resonates at the first frequency and the second antenna element that resonates at a second frequency different from the first antenna element are linear. Thus, the adverse effect of the electromagnetic wave on the antenna element can be reduced as compared with the case of the conventional rectangular radiation plate 3.
In addition, the middle part of the first antenna element and the second antenna element are formed in a spiral shape, and the tip part is formed on a flat surface, so that it is possible to have different directivities in the middle part and the tip part, The electrical characteristics of the antenna can be improved.
Further, by forming the midway part along a cylindrical column and the tip part on the flat surface of the connector, the space in the housing case can be used effectively, and the size can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a configuration of a mobile phone.
FIG. 2 is a schematic perspective view showing the inside of a mobile phone according to the present invention.
FIG. 3 is a schematic diagram showing electrical characteristics of each antenna element.
FIG. 4 is a schematic diagram showing an antenna element formation pattern according to another embodiment;
FIG. 5 is a schematic perspective view showing an arrangement state (1) of each antenna element according to another embodiment.
FIG. 6 is a schematic perspective view showing an arrangement state (2) of each antenna element according to another embodiment.
FIG. 7 is a schematic perspective view showing a configuration of a conventional two-resonance antenna device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Mobile phone, 11 ... Housing case, 14 ... Rod antenna, 15 ... Connector, 16 ... Circuit board, 25 ... Non-conductive member, 17, 27 ... First antenna element, 18 , 28, 38... Second antenna element.

Claims (1)

A housing case ;
A connector having a surface to which a cable is connected to the surface of the housing case;
A first antenna element that resonates at a first frequency;
A second antenna element that resonates at a second frequency different from the first antenna element ,
The first antenna element and the second antenna element are linear,
A midway portion in the first antenna element and the second antenna element is formed in a spiral shape along a non-conductive cylindrical column located in the vicinity of the connector in the housing case,
The portable wireless terminal device , wherein tip portions of the first antenna element and the second antenna element are formed on a non-conductive plane of the connector .

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