JP2898921B2 - Antennas and radios - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitting / receiving antenna for a portable device such as a portable telephone, a radio such as AM and FM, and a radio device such as a TV. More specifically, the present invention relates to a small antenna capable of transmitting and receiving two or more frequency bands and a wireless device using the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, an antenna for a wireless device such as a portable telephone is housed in a housing of a wireless device 31 when no communication is performed, and is externally connected to the housing during communication. A rod-shaped antenna 32 is used to extend the antenna. The rod-shaped antenna 32 is formed to have a length of about ４ wavelength or about 波長 wavelength of a received signal. Therefore, when the frequency band to be received is determined, the length of the rod-shaped antenna 32 is uniquely determined. Therefore, an antenna for transmitting and receiving a signal in a low frequency band necessarily has a longer length. In order to shorten the external dimensions of the elongated rod-shaped antenna, a method of winding an antenna wire such as a piano wire in a coil shape and covering the outer periphery thereof with a resin or the like has been adopted.

On the other hand, the antenna of such a portable device is
To avoid disturbing when moving, only a part of the antenna for receiving calls is installed so as to be exposed outside from the mobile device, or an antenna for receiving calls is separately installed, Sometimes the entire antenna is extended out of the mobile device to increase sensitivity and allow communication. The interrelationship between such a paging signal receiving antenna and the extended antenna at the time of communication is as follows: a top coil type in which the paging signal receiving antenna is loaded at the tip of the communication antenna; and a paging signal receiving antenna. There is a bottom coil type in which the antenna is always attached to the housing of the wireless device, and the paging signal receiving antenna is attached to the housing of the wireless device as it is even when the communication antenna is extended.

[0004] Therefore, the antenna for receiving the paging signal alone requires about ４ wavelength or about の of the received signal.
It is necessary to have a wavelength length, while it is preferably small so as not to be in the way when carrying it. Usually, it is wound in a coil shape to shorten the external length of the antenna. Also, the antenna at the time of communication is too long if the frequency band of the signal to be received is too low, which is inconvenient to handle, and the antenna for communication is also shortened in a coil shape.

[0005]

As described above, if the antenna wire is formed in a coil shape in order to reduce the length of the outer shape of the antenna, when the coil interval is large, there is little electrical problem but sufficient. However, if the coil spacing is narrow (the coil is wound tightly), the length will be shorter, but the component in the direction perpendicular to the direction of the antenna line will increase, and the radiation resistance of the antenna will decrease due to the relationship with the plane of polarization. There is a problem that the antenna performance is deteriorated even when the antenna is additionally used.

Further, the length of the above-mentioned antenna is about 1/4.
In the case of wavelength length, about 3/4 for triple frequency band
Wavelength and function similarly to an approximately quarter-wave antenna.
Therefore, transmission and reception can be performed with the same antenna in an odd multiple frequency band such as three times or five times. But,
For a double frequency band, the wavelength is about 1/2 wavelength,
If a special matching circuit for two wavelengths is not attached to the feeder side of the antenna, it will not function as an antenna. Can not send and receive as it is. However, in reality, for example, in a portable telephone, 900 MHz is used for GSM (Group Special Mobile) in a European system (corresponding to PDC (Personal Digital Cellular) in a Japanese system).
Band frequency is used and DCS (Digital Cellular)
System) (PHS (Personal
180 for "Handy Phone on System")
A frequency in the 0 MHz band is used, and it is preferable that both can be transmitted and received. Conventionally, in order to transmit and receive both, two antennas are separately provided, or an antenna wire is connected to the tip of the antenna for the high frequency band via a trap and further connected to an antenna line to match the length of the low frequency band. Must be used.

The present invention has been made to solve such a problem, and is an antenna that requires miniaturization, such as a transmitting / receiving antenna of a portable device. It is an object of the present invention to provide an antenna that does not reduce performance without adding a matching circuit.

Another object of the present invention is to enable a single antenna to simultaneously transmit and receive a signal in a frequency band such as an even multiple other than an odd multiple of the low frequency band together with the signal in the low frequency band. An object of the present invention is to provide an antenna capable of transmitting and receiving signals in the above frequency bands.

Still another object of the present invention is to provide an antenna suitable for a portable device in which a part of the antenna is extended from the housing at the time of communication and stored in the housing at the time of standby. In providing an antenna.

It is still another object of the present invention to provide a wireless device using an antenna which is miniaturized and can transmit and receive two or more frequency bands.

[0011]

SUMMARY OF THE INVENTION The present inventors have made it possible to reduce the size of an antenna portion of a portable device or the like that can receive a call signal when the antenna is stored for movement without adding a special matching circuit. In order to obtain an antenna that does not degrade the performance and to obtain an antenna capable of transmitting and receiving signals in two or more frequency bands including a frequency band other than an odd multiple with the small antenna, intensive studies have been made. As a result, by bending the antenna element so as to be substantially parallel along its long (axial) direction, if the number of times of bending is about 1 to 6, for example, 90
For the first frequency band of about 0 MHz, the electrical length of the antenna element does not change so much,
Acts as an antenna having a wavelength length, and for a second frequency band that is about twice as high, the electrical length greatly changes to about 3/4.
Acts as a wavelength antenna, and adjusts the number of turns and the interval between them so that the desired frequency is not an odd multiple of the desired frequency.
It has been found that signals in the above frequency bands can be transmitted and received.

In the antenna according to the present invention, the antenna element made of a long conductor is folded back at least once so as to be substantially parallel along the long direction, and a folded portion is formed in the antenna element . The antenna
The element is substantially in its entirety relative to the first frequency band.
It is formed to have a length that can resonate at ４ wavelength, and
The return part provides electrical coupling between adjacent antenna elements.
To a second frequency band that is almost twice as large as the first frequency band.
On the other hand, it is formed so as to be able to resonate substantially at ／ wavelength .

[0013] The term "substantially parallel" as used herein does not mean completely parallel, but means a positional relationship that allows capacitive and / or inductive coupling between adjacent antenna elements. Further, the long direction means a direction in which the electromagnetic wave propagates along the conductor.

Further, substantially 1/4 wavelength or 3/4 wave
The length that can resonate with the length is about after the bent part is formed
Resonates at 1/4 wavelength or 3/4 wavelength, and
Transmit and receive signals with normal coupling without significant loss
Means the length that can be made
Due to the effects of the R component and L component of the
Means the length fine-tuned by cut and try
You .

[0015]

The antenna element is an electrical insulator;
A small antenna can be easily obtained by being formed on the outer periphery of the cylindrical body made of . In addition, the antenna
One end of the element extends circumferentially around the outer periphery of the cylindrical body
With a ring part, it comes into contact with mounting
Easy electrical connection .

[0017]

The elongated conductor is formed in a zigzag shape.
The Rukoto preferable because the antenna is further reduced.

[0019]

[0020]

A specific example of the structure of the antenna according to the present invention includes a first antenna portion mounted on a radio device and having one end connected to a power supply portion, and a power supply portion when housed in a housing of the radio device. is separated from, Ri Do from said second antenna portion having one end portion is the other end portion electrically coupled to the first antenna portion when extended from the wireless unit to the outside, said first antenna The unit is constituted by the antenna according to claim 1 .

The other end of the first antenna unit and the one end of the second antenna unit may be electrically coupled to each other in a non-contact, capacitive and / or inductive manner without being directly electrically connected. May be done. In this case, since no structure such as a contact piece is required, there are advantages such as mechanical stability.

The first antenna element is provided with a first antenna element having a folded portion formed by a band of an electrically good conductor around an outer periphery of a cylindrical bobbin made of an electrical insulator. With this configuration, it is possible to obtain a small multi-frequency band antenna suitable for calling a portable device.

A specific structure for electrically connecting the first and second antenna units is to be mounted on a radio and to have one end thereof.
A first antenna unit connected to a power supply unit;
When housed in the housing, it is separated from the power supply
One end of the wireless device when extended from the housing
Is electrically coupled to the other end of the first antenna unit
A second antenna unit, wherein the first antenna unit
However, if the antenna element made of a long conductor is
At least one diffraction so as to be substantially parallel along the direction
Is returned to the outside of the cylindrical bobbin made of electrical insulation.
Is formed by being provided on the circumference, one end of said first antenna element is electrically connected to a power supply mounting bracket provided at the lower end of the first antenna portion, said first antenna element The other end is provided with a protrusion protruding toward the inner peripheral side of the bobbin through a through hole provided in a part of the side wall of the bobbin, and a second antenna element is provided at a lower end of the second antenna unit. The protrusions are obtained by fitting the protrusions into recesses of a metal stopper provided so as to be electrically connected to the stopper.

Another specific structural example of the antenna according to the present invention includes a first antenna portion having a stopper at a lower end portion which can be connected to the power supply portion, and a power supply portion when housed in the housing of the radio. is separated, consists of a second antenna portion capable of connecting the feeding portion by the stopper portion provided on the lower portion when extended externally from the casing of the radio apparatus, the first antenna portion according to claim 1 A structure may be used in which the fastener of the first antenna unit and the upper end of the second antenna unit are fixed.

[0026]

[0027]

According to another aspect of the present invention, there is provided a wireless device comprising: a transmission / reception circuit; a housing for covering the transmission / reception circuit; a power supply unit provided near the housing and electrically connected to the transmission / reception circuit; A wireless device having an antenna attached and electrically connectable to the power supply unit, wherein the antenna according to claim 1, 5 or 9 is used for at least a part of the antenna.

[0029]

Next, an antenna according to the present invention will be described with reference to the drawings.

FIG. 1 is a diagram for explaining the basic structure of the antenna of the present invention. In FIG. 1, reference numeral 1 denotes an antenna element made of a long conductor such as a copper wire, a piano wire, a strip-shaped conductive plate or a thin film, and one end of which is connected to a connector 3 via a housing 2 of a portable device or the like. The power supply unit 3a is connected to a transmitting / receiving circuit (not shown) by the cord 4 from the power supply unit 3a. As shown in FIG. 1, the antenna of the present invention is folded so as to be substantially parallel along the longitudinal direction of the antenna element 1, and the folded portion 1 a
Is provided.

As described above, the present inventors have found that by bending the antenna element 1 so as to be substantially parallel to the longitudinal direction thereof as shown in FIG.
It has been found that resonance is possible even in a frequency band such as an even multiple other than an odd multiple of a certain frequency band. That is, for example, the antenna element 1 formed in a length of about 1/4 wavelength of a frequency band f _1, by the folded portion 1a of the aforementioned is formed, and capacitive coupling between the antenna elements 1 adjacent to each antenna due relationship between the even mode of the mode propagating elements 1 (the even) and odd mode (odd), whereas no change electric length much for frequency band f ₁ and frequency band of an odd multiple thereof, It has been found that the electric length of an even-numbered frequency band such as twice or a frequency band in the vicinity thereof can be significantly changed by adjusting the number of times of folding or the interval of the antenna element 1 due to the folding.

The basic structure of the antenna of the present invention will be described in more detail with reference to FIG. The antenna element 1 has a total length A + B + C extending in the longitudinal direction.
(A and b are very small and can be ignored), but the first frequency band f which is the lowest frequency band of the signal to be transmitted and received.
₁ about is formed such that the length of the (substantial meaning described above) a quarter wavelength. In the example in which the antenna element 1 is shown in FIG. 1, two folded portions 1a are provided,
It is folded in three. The lengths A, B, and C in the longitudinal direction of each of the three folds are almost equal, and the intervals a,
b is adjusted to resonate as described above, for example with respect to twice the frequency band f ₂ frequency band f ₁ (= 2f _1). The intervals a and b are almost the same, but are smaller than the lengths A, B, and C in the longitudinal direction, and the length is negligible.

The spacing a, by adjusting the number of b and folded, whereas unaffected electrical length less for frequencies f _1, for the frequency band f ₂ (= 2f ₁₎ Can be about 3/4 wavelength electrical length. This is because the matching state of １ ／ wavelength is maintained for the frequency band f ₁ (for example, 900 MHz) and an odd multiple thereof, so that the antenna element 1 is not affected by the bending. for the frequency band of the even multiple or near the f _1, presumably because the electrical length is changed in relation to the current direction by the relationship between the capacity and even and odd modes between the antenna element 1. As a result, f ₁
Can be transmitted and received in both odd and even frequency bands. In addition, by adjusting the interval between the antenna elements and the number of times of folding, it is possible to resonate in an intermediate frequency band other than an even multiple.

As described above, since the antenna element is folded into three parts, the total length L as the outer shape of the antenna after the protective case made of resin or the like is formed around the antenna element is about 1/4 of the 1/4 wavelength. 3 and shorter, 90
Even for a frequency in the 0 MHz band, it can be as short as about 3 cm. By further increasing the number of wraps,
The total length of the antenna can be further reduced.

If the number of the above-mentioned folded portions 1a is too large, the interline capacity becomes large, which is not preferable, and is preferably not more than 10 times, and more preferably about 2 to 6 times. It is preferable that the number of the folded portions 1a be an even number because the polarization plane becomes uniform. Further, when the above-mentioned f ₁ is in the 900 MHz band,
About 1 to 5 mm is preferable.

The above-mentioned antenna element 1 may be a linear wire such as a copper wire or a piano wire, as shown in FIG. 1 by punching a metal plate, etching a thin film formed by vapor deposition, or the like. The belt-shaped body (thin and wide) having a thin shape may be bent. By forming with a strip,
It can also be easily formed on the edge of a printed circuit board or the like. Further, these antenna elements can be entirely fixed by a mold or the like after adjustment. Even if the physical total length of the antenna element 1, that is, the length of A + B + C is not substantially ４ wavelength of the frequency band f ₁ but is formed to be substantially 波長 wavelength, resonance occurs. The transmission and reception can be performed by adding a matching circuit to the power supply unit. In this case, for the frequency band f ₂ twice as f _1, it is adjusted to be an electrical length of one wavelength or 3/2 wavelength in the folded portion 1a.

Further, the antenna element 1 may be bent in the same direction on the same plane as shown in FIG. 1 as shown in FIG. 1, but for example, in FIG. 1, the third element piece (C Long element) may be folded three-dimensionally so as to be closer to and parallel to the other two element pieces on the front side of the drawing. In short, the antenna element 1 may be bent so that the direction in which the antenna element 1 is bent is substantially parallel to the longitudinal direction.

As described above, since the antenna of the present invention is bent along its long direction, the long direction of the antenna element with respect to the plane of polarization of the electromagnetic wave is always constant, and the electric length is about 1/4 wavelength. Is adjusted so as to be an odd multiple of the length of the entire antenna without reducing the performance of the antenna without adding a matching circuit.
Can be shortened. However, in order to further reduce the length of the outer shape of the entire antenna, a coarse zigzag shape or a coil that does not deteriorate the antenna performance can be formed. An example is shown schematically in FIG.

FIGS. 2 (a) and 2 (b) show the antenna element 1 in which a zigzag pattern is formed in advance or a coil in which a coarse coil is formed is folded in the longitudinal direction as shown in FIG. FIG. 2 (c) shows a roughly coiled antenna element 1 having a folded portion as shown in FIG. In any of the examples, by forming a coarse zigzag shape or coil that does not affect the radiation characteristics of the antenna, the overall length of the outer shape of the antenna can be shortened without being affected by the antenna performance.

Next, an example in which the antenna of the present invention is applied to an antenna suitable for a portable device such as a mobile phone will be described.
This will be described in detail with reference to FIGS.

FIGS. 3A and 3B are cross-sectional views of an antenna for a cellular phone, for example. FIG. 3A is a cross-sectional view when the antenna is extended during communication, and FIG. FIG. 4 is an explanatory view of a state in which only the first antenna unit is exposed outside the housing so as to be able to receive a call signal, and is received in a housing of the telephone.

In FIG. 3, reference numeral 10 denotes a first antenna unit which is always exposed to the outside of the housing of the portable device, and is capable of receiving a call signal. This is the second antenna unit to be operated.

The first antenna section 10 has a first antenna element 12 on the outer periphery of a cylindrical bobbin 11 made of PE (polyethylene) or POM (polyoxymethylene) as shown in FIG. Is press-fitted and pressed by the spring property of the material. The first antenna element 12 is obtained by punching out a leaf spring made of, for example, phosphor bronze or beryllium copper by a press and then rounding it, as shown in FIG.
Is formed in a cylindrical shape as shown in FIG. 1, and the entire length in the longitudinal direction is formed to be substantially a quarter wavelength of, for example, a 900 MHz band. First antenna element 12
Is formed in a ring shape, and is electrically connected to the mounting bracket 13 by being press-fitted into the inner circumference of the mounting bracket 13 together with the bobbin 11 (see FIG. 3A).
The other end of the first antenna element 12 has a protrusion 12
b is formed, and is a lock spring that can be fitted and electrically connected to and fixed to the concave portion on one end side of the second antenna portion 20. As shown in FIG. 4 (c), the first antenna element 12 is provided with six folded portions 12c and formed in seven element pieces as shown in FIG. 4 (c). As shown in (2), three element pieces may be formed at two folded portions. The first antenna unit 10 is attached by screwing a screw portion 13a of a mounting bracket 13 of the first antenna unit 10 into a housing of a portable device such as a portable telephone. Reference numeral 14 denotes a cover made of ABS (acrylic butadiene styrene), an elastomer, or the like, which is screwed into an upper portion of the mounting bracket 13 to protect the first antenna element 12.

The second antenna section 20 is used by extending it from the housing to the outside at the time of communication.
A substantially 1/2 wavelength length piano wire in the 00 MHz band,
Alternatively, a second antenna element 21 made of a coil of copper wire or the like is formed so that its periphery is protected by a tube 22 made of POM, elastomer, or the like, and can move inside the bobbin 11 of the first antenna unit 10. . Second
Antenna element 21 has a trap 25
Is provided, and acts as a continuous full length for the 900 MHz band, is cut off for the 1800 MHz band, and only the lower half from the trap 25 acts as an antenna. The lower end has a brass or P electrically connected to one end of the second antenna element 21.
A stopper 23 made of BS (phosphor bronze) or the like is screwed into the tube 22 and fixed. A top 24 made of ABS, elastomer, or the like is fixed to the upper end by screwing or integral molding.
Knob when pulling out from the housing to the outside.

The stopper 23 has a second antenna 20
A concave portion 23a is formed on the outer periphery so that the protrusion 12b of the first antenna element 12 fits and is electrically connected when is pulled out of the housing and extended. As a result, when the second antenna unit 20 is extended,
Antenna element 12 and second antenna element 21 are connected to each other. For example, a 900 MHz band signal becomes substantially a 3/4 wavelength antenna, and can transmit and receive signals in resonance. In addition, double 1800MHz
For band signals, the first antenna section is substantially 3 /
The second antenna section 20 has a lower half of the trap 25, and has an electrical length of 4 wavelengths.
Because of the electrical length of the wavelength, transmission and reception can be similarly performed by resonance.

Further, the top 2 of the second antenna section 20
A recess 24a is also provided on the outer periphery of the lower end of the top 4 and when the second antenna unit 20 is housed in the housing, the top 24 is inserted up to the top of the bobbin 11, and the recess 24
The projection 12b of the first antenna element 12 is fitted and fixed to a. Since the top 24 is made of resin and electrically insulated, the second antenna unit 20 housed in the housing is completely electrically separated and does not function as an antenna. Therefore, only the first antenna unit 10 functions as an antenna for receiving a call signal.

Each of the 900 MHZ when the second antenna unit 20 is pulled out of the housing to extend and communicate, and when the second antenna unit 20 is stored in the housing and on standby, respectively.
The relationship between the electrical lengths of the antennas in the z-band and the 1800 MHz band is shown by diagrams in FIGS. 5A to 5B and FIGS. 5C and 5D, respectively, and the electrical length at that time is represented by the wavelength λ. .
In the 1800 MHz band, the length of the second antenna unit 20 is reduced to ト ラ ッ プ by the trap 25 provided in the second antenna unit 20, and the second antenna unit 20 operates at 1800 MHz.
The band also has about a half wavelength.

The example shown in FIG.
In this example, the first and second antenna elements 20 are electrically connected to each other. However, even if the first and second antenna elements are not electrically connected to each other, the capacitance can be increased by bringing the mutual antenna elements close to each other. Electrical coupling by positive and / or inductive coupling can also be used. In this case, the stopper 23 can be formed of an electrically insulating material such as a resin instead of a metal.

FIG. 6 is a diagram showing an example in which the antenna of the present invention is applied to a top coil type in which the first antenna unit 10 is loaded on the upper part of the second antenna unit 20. That is, when one end of the first antenna element 15 having the folded portion of the present invention formed on the first antenna portion 10 is connected to the stopper 16 and the second antenna portion 20 is housed in the housing, The stopper 16 is connected to the power supply unit of the housing. In the second antenna section 20, a stopper 26 is connected to one end of a second antenna element 25. Therefore, when the second antenna unit 20 is pulled out of the housing and extended, the stopper 26 is connected to the power supply unit of the housing. The length of the first antenna element 15 is generally set to a length substantially equal to a quarter wavelength of the first frequency band f ₁ , for example, 900 MHz band.
Is typically in the first frequency band f ₁ , eg 900M
It is formed to have a length of substantially 波長 wavelength in the Hz band. However, the second antenna element 25 may also be substantially １ ／ wavelength long, and a matching circuit may be provided on the housing side. In the example shown in FIG. 6A, the stopper 16 of the first antenna unit 10 and the upper end of the second antenna unit 20 are directly in electrical contact and connected, and FIG. In the example shown in (1), the stopper 16 of the first antenna unit 10 and the upper end of the second antenna unit 20 are fixed with an electrically insulating material 18 and are coupled capacitively and / or inductively. It can also be electrically coupled. Reference numeral 17 denotes a top formed by covering the first antenna element 15 with resin or the like.

FIG. 6C is a diagram showing an example in which the second antenna portion also uses the antenna element 25 having the folded portion of the present invention. In FIG. 6 (c), the first
Antenna unit 10 and second antenna unit 20 are insulator 1
8 shows an example of being connected and electrically separated,
They may be connected by direct contact or may be electrically coupled.
In a case where both are completely electrically separated from each other and the first and second antenna portions 10 and 20 are provided with the folded portion of the present invention, the first and second antenna elements 15 and 15 are shown in FIG. , 25 are shown in the same size, but by increasing the outer dimensions by reducing the folded portion of the second antenna element 25, the second antenna element 20 is pulled out of the housing and extended. Only the second antenna unit 20 functions alone as an antenna, and the antenna at the time of communication can be more improved than the first antenna unit 10, and the antenna can be shorter than before. Even in this case, communication can be performed in multiple frequency bands.

In a wireless device such as a cellular phone, it is preferable that the antenna is small and capable of transmitting and receiving in a multi-frequency band. By using the antenna of the present invention for the antenna, the antenna is small, portable and convenient. A wireless device capable of transmitting and receiving in a frequency band is obtained. That is, in the wireless device, the transmission / reception circuit is covered with the housing, the antenna is provided so as to be electrically connected to the transmission / reception circuit, and connected to a power supply unit provided near the housing. If, for example, the antenna described with reference to FIGS. 3 to 6 is used as the antenna, the wireless device of the present invention can be obtained by directly attaching the antenna to the housing. Further, the antenna having the basic structure shown in FIG. 1 is not limited to the specific antennas of FIGS. A wireless device capable of transmitting and receiving signals with high sensitivity can be obtained.

[0052]

According to the present invention, since the antenna element made of a long conductor is bent so as to be parallel along the long direction, the antenna as a whole is not degraded without deteriorating the radiation characteristics of the antenna. The physical length on the outer shape as can be shortened.

Further, due to capacitive coupling and interaction between the bent and adjacent antenna elements, it is possible to resonate even in a frequency band of an even number or in the vicinity thereof,
Transmitting and receiving signals in a number of frequency bands with one antenna element without connecting antenna elements for two or more frequency bands with a frequency band other than an odd multiple frequency band via a trap or the like. Can be.

Further, according to the antenna of the present invention having a specific structure suitable for a portable device, the antenna for receiving a call signal can be made very small and the antenna performance can be maintained at a high level. Further, by forming the antenna element with a band-shaped body, a small-sized high-performance antenna which is easy to manufacture can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a basic structure of an antenna according to the present invention.

FIG. 2 is a diagram showing a variation of the antenna of the present invention.

FIG. 3 is an explanatory diagram of a specific example in which the antenna of the present invention is applied to an antenna suitable for a portable device.

FIG. 4 is an explanatory perspective view of a bobbin and a first antenna element of a first antenna unit in FIG. 3;

FIG. 5 is a diagram showing the electrical length of each antenna when the second antenna of the antenna of FIG. 3 is accommodated and when the antenna is pulled out of the housing.

FIG. 6 is an explanatory diagram of a top coil type in which a first antenna using the antenna of the present invention is fixed to an upper end of a second antenna unit.

FIG. 7 is an explanatory diagram of an antenna attached to a conventional wireless device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna element 10 1st antenna part 11 Bobbin 12 1st antenna element 20 2nd antenna part 21 2nd antenna element

Continued on the front page (72) Inventor Tadashi Oshiyama 7-5-11 Takinogawa, Kita-ku, Tokyo Yokoo (72) Inventor Michio Arai 7-5-111 Takinogawa, Kita-ku, Tokyo Yokoo (56 References JP-A-5-543834 (JP, A) JP-A-5-347507 (JP, A) JP-A-7-106994 (JP, A) JP-A-7-288412 (JP, A) 8-32332 (JP, A) JP-A-7-321527 (JP, A) JP-A-56-710 (JP, A) JP-A-6-34309 (JP, U) JP-A 5-9013 (JP, A) U) Japanese Patent Publication No. 51-35099 (JP, B2) Japanese Patent Publication No. 8-503835 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) H01Q 5/00-9/46

Claims (10)

(57) [Claims] An antenna element made of a long conductor is bent at least once so as to be substantially parallel along a long direction, and a folded portion is formed in the antenna element. The whole
Can resonate at substantially 1/4 wavelength for one frequency band
Formed with a length, and the folded portion is adjacent to the antenna.
The first frequency band due to electrical coupling between
Substantially 3/4 wave for the second frequency band which is almost twice as large as
An antenna formed to resonate long . 2. The antenna element according to claim 1, wherein said antenna element is electrically insulated.
2. A body formed on the outer periphery of a cylindrical body.
Antenna . 3. One end of said antenna element is located
Claims having a ring portion extending in the circumferential direction on the outer periphery of the cylindrical body
Item 2. The antenna according to Item 2 . 4. The elongated conductor is formed in a zigzag shape.
It is formed by claim 1, 2 or 3 antenna according. 5. A first antenna unit mounted on a wireless device and having one end connected to a power supply unit, and a first antenna unit separated from the power supply unit when housed in a housing of the wireless device, It consists of a second antenna portion having one end portion is the other end portion electrically coupled to the first antenna portion when it is extended from the body to the outside, the first antenna portion according to claim 1 Antennas that make up the antenna. 6. An electric connection between the other end of the first antenna unit and one end of the second antenna unit is capacitively and / or inductively electrically non-contact. The antenna according to claim 5, wherein 7. The first antenna element according to claim 1, wherein the first antenna element has a folded portion formed by an electrically conductive band on the outer periphery of a cylindrical bobbin made of an electrical insulator. claim 5 or 6 antenna according constituted by being provided. 8. One end is connected to a power supply unit while being attached to a wireless device.
And the first antenna unit is housed in a housing of the wireless device.
Is separated from the power supply unit and
When extended from the body to the outside, one end thereof is the first
A second antenna electrically coupled to the other end of the antenna unit;
And the first antenna section is an elongated conductor.
The antenna element consisting of the body is substantially
At least one turn so that they are parallel
Provided on the outer periphery of a cylindrical bobbin made of a gas insulator
Is formed by one end of said first antenna element is electrically connected to a power supply mounting bracket provided at the lower end of the first antenna portion, the other end of said first antenna element Is provided with a projection projecting toward the inner peripheral side of the bobbin through a through hole provided in a part of the side wall of the bobbin, and electrically connected to the second antenna element at the lower end of the second antenna unit. It said first antenna portion and the resulting luer antenna and the second antenna portion is electrically connected by the protrusion into the recess of the metallic stopper provided connected is fitted. 9. A first antenna section having a stopper at a lower end portion connectable to the power supply section, and the power supply section when housed in the housing of the wireless device is separated from the housing of the wireless device to the outside. A second antenna portion which can be connected to a power supply portion by a stopper portion provided at a lower end portion when extended;
2. An antenna comprising the antenna according to claim 1 wherein the stopper of the first antenna is fixed to the upper end of the second antenna. 10. A transmission / reception circuit, a housing covering the transmission / reception circuit, a power supply unit provided near the housing, and electrically connected to the transmission / reception circuit; A wireless device having an antenna that can be electrically connected to a unit, wherein the antenna according to claim 1, 5, or 9 is used for at least a part of the antenna.