JP3253255B2 - Antenna for portable wireless device and portable wireless device using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for a portable radio used for a mobile radio or a semi-fixed terminal such as a PHS (Personal Handyphone System), a mobile phone, a wireless LAN, and the like. Related to portable radios. More specifically, a small, thin, high-performance radio antenna and a portable radio having a built-in antenna that can be built into the housing of the mobile radio and can also be used as a semi-built-in or external fixed type About the machine.

[0002]

2. Description of the Related Art As shown in FIG. 8A, a conventional antenna for a wireless device such as a portable telephone is used when a linear antenna 32 is pulled out from a housing 31 of the wireless device. As shown in FIG. 8B, a helical coil type antenna 33 is used fixedly attached to the outside of the housing 31 of the wireless device.

[0003] The linear antenna 31 and the helical coil type antenna 33 require an electrical length of 1/4 wavelength of radio waves to be transmitted and received, and the linear antenna 32 is long and inconvenient to carry. 31 and is pulled out and used at the time of use. The helical coil type antenna 33 is formed by winding a long antenna wire in a coil shape in order to shorten the outer diameter. When the helical coil is densely wound in order to shorten the outer diameter, the direction of the antenna wire is reduced. And the component in the direction perpendicular to the direction increases, the radiation resistance of the antenna decreases in relation to the plane of polarization, and the antenna performance decreases.
For this reason, even a helical antenna cannot be made extremely short, and any antenna cannot avoid a certain degree of protrusion.

On the other hand, an antenna which has been conventionally considered as an antenna having an antenna element formed on the surface of a dielectric substrate so as to be built in a radio device is an inverted-F antenna as shown in FIG. A patch antenna as shown is contemplated. The inverted F antenna is
As shown in FIG. 9A, a plate-like antenna element 42 having a size corresponding to １ ／ of the wavelength of a signal to be transmitted and received is formed on the surface of the dielectric substrate 41, and is shown in FIG. 9B. The antenna element 42 is provided on the ground plate 43 so that one end of the antenna element 42 is grounded. Also,
As shown in FIG. 10, the patch antenna is a ferroelectric (ceramic or resin having a large dielectric constant) substrate 4.
A flat antenna element 47 corresponding to a half of the wavelength of a signal to be transmitted and received is formed on the surface of 6, and a feeder 49 is provided at the center of the antenna element 47 via a conductor 48.

[0005]

With the recent reduction in the size and weight of electronic devices, further reduction in the size and weight of portable devices has been required, and mobile phones and the like have also become very small. Along with this, the protrusion of the antenna from a housing of a mobile phone or the like is a major bottleneck in further miniaturization and improvement in convenience of carrying.

On the other hand, when the above-mentioned inverted F-shaped antenna is used, for example, in a portable telephone, it is arranged on the circuit board 52 toward the back of the portable telephone 51 as shown in FIG. On the back side of the antenna element 42, there is a ground plate 53, and transmission and reception cannot be performed from the back side (the front side of the mobile phone 51), and the directivity of the antenna becomes a problem. For example, if the mobile phone is placed on a desk or the like with its back side down, it will be difficult to receive and the incoming call rate will decrease, and the sensitivity will change depending on the direction of the mobile phone. Therefore, it is not suitable for mobile terminals. .

Further, since the grounding plate is provided on the back side, the capacitance between the grounding plate and the grounding plate increases, and the Q of the antenna increases. For this reason, the frequency bandwidth becomes narrow, usually about 3% of the resonance frequency, and it is required to suppress dimensional accuracy and variations in manufacturing. In addition, since the Q is high, when an antenna is built in, it is easily affected by the surrounding members, and the electrical characteristics tend to vary due to the dimensional accuracy of the antenna pattern and the degree of adhesion between the antenna pattern and the dielectric substrate. There is a problem that there is no means.

Further, since the above-mentioned patch antenna also has a large antenna element area and a large capacity, the inverted F
It has the same problems as a shaped antenna, and requires a half-wave size, so that the area is twice as large as that of an inverted F-shaped antenna, and it cannot meet the demand for downsizing.

The present invention has been made in view of such a situation, and is intended for a portable wireless device (mobile terminal) such as a PHS or a portable telephone, and has a small, thin, and high-performance built-in. It is intended to provide an antenna.

Another object of the present invention is to provide a portable wireless device which incorporates the small antenna and can cope with the influence of surrounding components.

[0011]

Means for Solving the Problems The present inventors have made intensive studies in order to reduce the size of the antenna and to enable transmission and reception even at frequencies twice as high. By inventing an antenna that can be miniaturized without lowering the sensitivity by bending the antenna element by folding it back in its longitudinal direction, and capable of transmitting and receiving even in an even-numbered frequency band such as twice. And Japanese Patent Application No. 8-160016. The antenna for a portable wireless device according to the present invention is such that the antenna element is formed on a dielectric substrate such as ceramics, preferably a dielectric substrate having a relative permittivity of 20 or more. Even when stored in the body, transmission and reception can be performed with high sensitivity.

An antenna for a portable wireless device according to the present invention comprises a dielectric substrate, an antenna element provided on one surface of the dielectric substrate, and a feeder provided at one end of the antenna element. There is folded at least once so as to be substantially parallel along the longitudinal direction, and the other end side only is formed wider than the one end side Rutotomoni, the back surface of the dielectric substrate
The antenna has a structure in which no grounding conductor is provided, thereby providing a chip-type antenna. As a dielectric substrate,
The use of ceramic, the dielectric constant is large, preferably made small form <br/> of.

[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. In addition, the long direction means a direction in which the band-shaped antenna element mainly extends even when the zigzag portion is formed.

[0014] At least a portion of said antenna element, rather it may also be formed in a zigzag shape, also approximately 2
You can send and receive signals in two frequency bands that have a double relationship
If it is formed like this, it can be an antenna that supports two frequencies
I can . An attachment land made of a metal film and a power supply land serving as the power supply section are provided at an end portion of the back surface of the dielectric substrate, and the mounting land and the power supply land are provided .
Can be bonded and mounted by simply placing it directly on the substrate surface
Structural der Rukoto facilitates attachment to a circuit board or the like by soldering or the like. Further, an adjustment land made of a metal film electrically connected to the other end of the antenna element is provided at an end of the back surface of the dielectric substrate, so that the adjustment land is provided on a circuit board or the like on which the antenna is mounted. This is preferable because it can be easily connected to an adjusting element for adjusting the resonance frequency to be set, and the resonance frequency can be easily adjusted.

A portable wireless device according to the present invention includes a circuit board on which a wireless circuit is formed, and a resin housing that covers the circuit board, wherein the antenna according to claim 1 is mounted on the circuit board. As well as metal on the back side of the antenna
So that you can send and receive from the back side
It is formed as follows. That is , when the circuit element formed on the circuit board is shielded by covering the circuit board with a metal casing in order to prevent adverse effects due to external electromagnetic waves, the antenna section is removed from the metal casing and the antenna is made of metal. The metal housing is provided with an opening so that the metal housing is not shielded. In the case where a ground (earth) plate or a metal film is provided on the back surface of the circuit board or the like, the antenna section is similarly removed.

The antenna according to claim 5 , wherein an adjustment element for adjusting a resonance frequency is provided on the circuit board so as to be electrically connected to the adjustment land or the feeding land of the antenna. If this is done, it is possible to easily adjust the resonance frequency even if the resonance frequency deviates due to manufacturing variations or the like, so that transmission and reception can be performed with high sensitivity.

Except for the vicinity of the antenna on the circuit board,
A ground conductor is provided, and impedance due to the influence of the ground conductor is provided.
In order to prevent a change in dance, the power supply unit side and the ground
By providing a transmission line of approximately 50Ω for impedance adjustment between the circuit element in the portion where the conductor is provided and the circuit side without being affected by a ground plane provided on a circuit board or the like on which the antenna is mounted. Are connected in a state where impedance matching has been achieved.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a portable radio apparatus according to the present invention.

FIG. 1A is a perspective view of a chip type antenna for a portable wireless device according to the present invention, and FIG. 1B is a rear view thereof. As shown in FIG. 1 (a), the antenna of the present invention has at least one antenna on a dielectric substrate 1 made of ceramics or the like so as to be substantially parallel to the longitudinal direction thereof.
The pattern of the antenna element 2 is formed by being folded and provided with the folded portion 2a. In the present invention, the power supply unit 3 is provided on one end (base) 21a side, and the other end (top) 23a is connected to one end 21a.
The antenna is formed wider than the a side, and is a λ / 4 top loading (top capacitive load) type antenna.

The dielectric substrate 1 is preferably made of a material having a large dielectric constant, such as a ceramic made of barium titanate (having a relative dielectric constant of about 20), because the antenna element 2 can be made small. It may be a dielectric material.

The pattern of the antenna element 2 is formed in a desired pattern on the dielectric substrate 1 by, for example, baking an alloy containing silver. The shape of the pattern of the antenna element 2 is as shown in FIG.
For example, the first element 21 and the second element 2
And a third element 23, and two folded portions 2a are formed at two locations so as to be substantially parallel to each other along the longitudinal direction. The electric length as a whole is, for example, the operating frequency of PHS 1895.15.
It is formed so as to have a wavelength of about 1/4 of 1917.95 MHz. This electric length changes depending on the inductance of the antenna element 2 and the coupling capacitance between the adjacent elements when the antenna element 2 is folded, and the coupling capacitance increases as the dielectric constant of the dielectric substrate 1 increases.
The length of the antenna element can be shortened as the coupling capacity increases.

In the chip type antenna shown in FIG. 1, the third element 23 on the top side is formed wider (for example, about three times) than the first and second elements 21 and 22, and the top capacitive load type is used. It has become. That is, as shown in the equivalent circuit diagram of FIG. 2B, the resonance is equivalent to the case where a planar antenna element is provided at the tip of the antenna element. The lower the frequency, the larger the area, the lower the resonance frequency. Therefore, as the width of the third element 23 is increased, the reduction rate of the antenna length (１ ／)
The ratio at which the physical length of the antenna required to resonate at a wavelength can be shortened). As a result, the length A × width B shown in FIG.
Has a very small size of about 1.8 mm,
An antenna having an electrical length of about 1/4 wavelength for the 0 MHz band is formed. The width and length of the element to be widened are set according to various conditions such as the required physical length of the entire antenna, the dielectric constant of the dielectric substrate, and the frequency of resonance.

In the example shown in FIG. 1, as shown in the rear view in FIG. 1B, lands made of a metal such as a silver alloy are provided at four corners on the back surface of the dielectric substrate 1, and an antenna element is provided. (Power supply lands) 3 connected to one end 21a of the antenna element, mounting lands 4 provided independently for attachment to the substrate by soldering or the like, and connected to the other end 23a of the antenna element. It comprises an adjustment land 5 for connection to a resonance frequency adjustment element. The power supply land 3 is electrically connected to one end 21a of the antenna element 2 via the side surface of the dielectric substrate 1. By mounting the antenna on a circuit board on which a wireless circuit is formed, wiring and wiring of the wireless circuit are reduced. The adjustment land 5 is directly connected to an adjustment element for adjusting a resonance frequency provided on a circuit board or the like on which the antenna is mounted. As a result, these lands make it easy to mount a low melting point metal such as solder or Au-Sn on a circuit board or the like of a wireless device.

In order to manufacture the above-described chip-type antenna, the antenna element 2 is formed by providing an antenna pattern on one surface of a large ceramic substrate using silver alloy silk printing or the like and printing it. Subsequently, lands 3 to 5 are formed at the corners of each chip by depositing a silver alloy or the like on the back surface of the substrate by baking or the like in the same manner as the front surface and patterning. Thereafter, the large ceramic substrate is cut and separated into chips. Next, one end 21 a of the antenna element 2, the power supply land 3 on the back surface of the substrate 1, and the other end 23 of the antenna element 2
A chip-type antenna is obtained by applying a silver alloy or the like to its side surface and baking it so that a and the adjustment land 5 are electrically connected to each other.

Next, the operation of the antenna of the present invention will be described. FIG. 2B shows an equivalent circuit of the antenna in which the folded portion of the present invention shown in FIG. 2A is formed corresponding to the D to G portions of the antenna. This antenna element 2 is used for transmitting and receiving signals 1
The current is maximum at point D on the power supply unit 3 side, is minimum at point G on the top side, and the voltage is the minimum at point D and G point is opposite. Is the largest. Since the antenna element 2 of the present invention is formed by being folded back along the longitudinal direction, the current is still large even at the point E which is located at a high position away from the feeding section 3. Since the top is folded so as to be at a high position away from the power supply point, the voltage is maximum at the point G at a high position away from the power supply unit 3. That is, a large current E is located at a high position away from the power supply unit 3.
There is a point and a point G which is the maximum point of the voltage. Therefore, it is convenient for transmission and reception over long distances. Further, the effective length of the antenna is increased and the radiation resistance is increased due to an increase in the current at a high place from the feeder 3, so that the radiation efficiency is increased and the gain is improved.

FIG. 2C shows the antenna of the present invention more schematically. That is, a capacitor P is formed between the wide portion on the top side and the ground plate via a dielectric substrate or the like, and the capacitor P serves as a load. As described above, this capacitance has an effect of lowering the resonance frequency of the antenna. As the area of the wide portion is increased, the resonance frequency is lowered, and even at a low frequency, the resonance length can be made extremely small to obtain an electrical length of 1/4 wavelength.
A small chip antenna of about 8 mm × 6 mm for the 00 MHz band can be obtained.

Further, the antenna element and the ground plate
This has the effect of lowering the resonance frequency due to the capacitance between them.
Is larger than the capacity of the above-mentioned inverted F-shaped antenna with the ground plate.
Not good (the distance between the antenna element and the ground plane is too long
Therefore, Q does not increase. Therefore, FIG.
As shown, the voltage standing wave ratio VSWR to frequency is shown.
Of dielectric and conductive materials near the antenna
The resonance frequency is f ₀₁To f₀₂Changes to VS
WR change is small, for example, VSWR is set to 2 or less
And the usable frequency bandwidth is about 15% of the resonance frequency
And become wider. Therefore, a ground plate for the radio is provided.
The antenna of the present invention is provided near the ground plate of the circuit board.
The effect is very small even if
Can be stored. On the other hand, the conventional inverted F-shaped antenna
As for the relationship between the vibration frequency and the VSWR, Q is large and FIG.
And the above-mentioned VSWR is set to 2 or less.
And the usable frequency bandwidth is about 3% of the resonance frequency.
narrow. As a result, dimensional errors and variations at the manufacturing stage
VSWR, that is, electrical characteristics such as gain
Change.

Further, the antenna of the present invention has no ground plate on the back surface of the dielectric substrate, and becomes an omnidirectional antenna in a horizontal plane, and is particularly suitable for a mobile device that moves.

As described above, according to the antenna for a portable wireless device of the present invention, in order to obtain an antenna having an electrical length of 1/4 wavelength, the antenna element is folded back along its longitudinal direction, and Since the wide portion is provided on the top side, the size can be extremely reduced.
Further, when the antenna element is folded back in the longitudinal direction, both the current and the voltage are formed at a high position away from the feeder, and the gain is improved. Furthermore, since there is no ground plate on the back surface of the dielectric substrate, a non-directional antenna can be obtained and Q can be reduced. Q
Can increase the bandwidth of transmittable and receivable frequencies, reduce the effects of manufacturing variations, and place the device near a grounding plate without being affected by it. It can be easily built into the machine. Of course, antenna 1
2 is semi-integrated as shown in FIG.
An external fixed type as shown in FIG. 7B can be used, but in any case, the size can be extremely reduced. In FIG. 7, reference numeral 11 denotes a resin housing, and reference numeral 13 denotes a circuit board.

Further, according to the antenna of the present invention, the land is provided on the back surface, so that the antenna can be easily attached to a circuit board or the like of a wireless device by using a low melting point metal such as solder or an adhesive such as epoxy resin. It is convenient because it can be attached. Further, since one end (base) side and the other end (top) side of the antenna element are connected to the power supply land and the adjustment land provided on the back surface of the substrate, respectively, the wiring of the wireless circuit and the power supply unit are connected. Connection becomes very easy, and by providing an adjustment element for adjusting the frequency on the circuit board, frequency adjustment that can resonate can be performed very easily. The resonance frequency of the adjusting element is increased by reducing its width, and the resonance frequency is increased by reducing its length.

In the above example, each of the elements 21 to 23
Are formed in a straight line, but as shown in FIG. 4, a zigzag portion is formed in at least a part of all the elements or the antenna element, thereby shortening the length of routing the antenna element. And a more compact antenna can be obtained. The zigzag portion is more effective because it is effective for radiation to be provided on the high voltage side of the power supply portion.

Next, the portable wireless device of the present invention will be described with reference to FIG.

The portable wireless device of the present invention has a resin housing 1 as shown in FIG.
An antenna 12 is provided in one of the circuit boards 13 on which a radio circuit for processing signals transmitted and received by the antenna 12 is formed.
Is installed. When the wireless circuit formed on the circuit board 13 is shielded so as not to malfunction due to an external electromagnetic wave, a metal housing 14 is provided around the circuit board 13. A notch is formed to be exposed.

The mounting of the chip type antenna 12 on the circuit board 13 is performed at one corner of the circuit board 13 as shown in FIG.
The soldering is performed by using a land provided on the back surface of the second substrate. In this case, when a ground plate or a metal film for grounding is provided on the back surface of the circuit board 13, the impedance is 50
As shown in FIG. 5B, the impedance is reduced by interposing the 50Ω coaxial cable 15 by a length of about 5 mm (refer to H) from the end of the ground plate 17 because the impedance is lower than Ω. Matching can be achieved.
In this matching, by adjusting the length of the coaxial cable 15, the matching can be adjusted with respect to a change in impedance caused when the antenna is mounted on an actual set. This is a kind of brown antenna, and even if such a coaxial cable is not used, as shown in FIG. 6, even if a 50 Ω strip line 18 is provided with a length of about 5 mm (see H), the same is true. The impedance can be adjusted by changing the length.

The portable wireless device according to the present invention further comprises:
As shown in (b), an adjustment element 16 for adjusting the resonance frequency is provided on the circuit board 13. When the antenna 12 is mounted on the circuit board, the adjustment land is provided so as to be connected to the adjustment element 16. As a result, the adjusting element 16 provided on the circuit board 13 also becomes a part of the antenna, and the resonance frequency can be changed to be high by shortening the adjusting element 16, and the resonance frequency can be changed by narrowing the width. The frequency can be increased. In addition, even if the adjusting element is not connected to the top side of the antenna element, circuit wiring (the aforementioned 50Ω coaxial cable) via the adjusting element to the feeder side, that is, the feeding land.
May be connected.

In the above example, the chip type antenna 12 is
Although only one antenna is provided at one corner of the circuit board 13, two or more antennas may be mounted at distant positions on the circuit board to constitute a polarization diversity antenna. That is, since the transmission / reception level fluctuates greatly due to fading in a valley of a building or the like, the switching unit switches to the antenna having the best reception sensitivity among the reception sensitivities obtained from a plurality of antennas to perform transmission / reception in the best condition. Alternatively, it is possible to receive signals with high sensitivity by combining received signals of two antennas and performing signal processing. In the portable wireless device of the present invention, the antenna is very small and can be built in the housing, so that the polarization diversity configuration can be made with such a small wireless device. Such a diversity antenna can also be composed of an external antenna attached to the outside of the conventional resin housing 11 and a built-in antenna of the present invention mounted on a circuit board.

In the above example, the chip-type antenna is mounted on the circuit board on which the radio circuit is formed. However, if the circuit board is a dielectric board, the above-described antenna element pattern is formed on the surface of the board. Thus, a circuit board with an antenna can be directly provided. In this case, the antenna element can be formed small by using a dielectric substrate having a dielectric constant as large as possible as a circuit substrate. In this case, the adjusting element can also be formed continuously with the antenna element. It should be noted that no other metal such as a metal housing is present in the vicinity of the antenna element as in the case described above.

According to the portable wireless device of the present invention, since the antenna is built in the resin housing, there is no need for the antenna portion to protrude to the outside as in the prior art, and the portable wireless device is very compact and easy to carry. Become. Even if the antenna is semi-internal or externally fixed, the protrusion is very small because the antenna is small, and the convenience of carrying is improved. In addition, the resonance frequency can be easily adjusted, and a high-performance portable wireless device with almost no influence from a circuit board or the like near the antenna can be obtained.

In the above description, transmission and reception of a signal in one frequency band has been described. However, the antenna folded along the longitudinal direction as shown in FIG. As disclosed by the present inventors in this publication, the antenna can be formed so as to be able to transmit and receive both frequency bands of about twice. Therefore, by forming the antenna element so as to have a length of 1/4 wavelength with respect to the 900 MHz band, for example, the overall size is about twice as large as that of the above-described example (1900 MHz band), The antenna can be a small built-in antenna capable of transmitting and receiving both the band and the 1900 MHz band.

[0040]

According to the antenna for a portable radio of the present invention, it is very small and thin, has a wide operating frequency bandwidth, and has a high gain.
Since the change in R is small, it is very suitable for a built-in antenna of a portable wireless device.

Further, by providing mounting lands, power supply lands, adjustment lands, and the like on the rear surface of the antenna, the antennas can be easily mounted on a circuit board of a radio device, and at the same time, can be connected to a power supply unit and have a resonance frequency. A connection is made to the adjusting element.

Further, since the antenna is formed by the folded antenna, the dual band can be easily formed even in the frequency band having a double relationship. Also, because the antenna is small,
It is also possible to use a built-in antenna dedicated to reception when configuring a diversity antenna.

A portable radio using this antenna is:
It is possible to eliminate the protrusion by the antenna, and to achieve further miniaturization of the portable radio,
It becomes a portable radio that is very convenient to carry. Moreover, by providing the frequency adjusting element on the wireless device side, a change in the resonance frequency caused by manufacturing variations can be easily adjusted, and the performance becomes high.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of an antenna for a portable wireless device according to the present invention.

FIG. 2 is an explanatory diagram of an equivalent circuit of the antenna of FIG. 1;

FIG. 3 shows the resonance frequency and VSW of the present invention and the conventional antenna.
It is a figure which shows the relationship of R.

FIG. 4 is a diagram showing a modification of the antenna of FIG. 1;

FIG. 5 is an explanatory diagram of one embodiment of a wireless device equipped with the antenna of FIG. 1;

FIG. 6 is a diagram showing a modification of the wireless device of FIG. 5;

FIG. 7 is a diagram showing a modification of the wireless device of FIG. 5;

FIG. 8 is a diagram illustrating an example of an antenna of a conventional portable wireless device.

FIG. 9 is an example of an antenna in which an antenna element is provided on a conventional dielectric substrate.

FIG. 10 is an example of an antenna in which an antenna element is provided on a conventional dielectric substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric board 2 Antenna element 3 Feeding part 4 Mounting land 5 Adjustment land 11 Resin casing 12 Chip antenna 13 Circuit board 15 Coaxial cable 16 Adjustment element

Continuation of front page (56) References JP-A-5-191126 (JP, A) JP-A-5-259724 (JP, A) JP-A-8-139520 (JP, A) JP-A-9-36648 (JP, A) JP-A-8-51313 (JP, A) JP-A-56-704 (JP, A) JP-A-5-37416 (JP, A) JP-A-6-224623 (JP, A) JP-A-8-330830 (JP, A) JP-A-10-13135 (JP, A) JP-A-9-55620 (JP, A) JP-A-8-288724 (JP, A) JP-A-6-152221 (JP, A A) JP-A-6-268433 (JP, A) JP-A-7-263930 (JP, A) JP-A-5-76109 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) H01Q 1/24 H01Q 9/30 H04B 1/38

Claims (8)

(57) [Claims] An antenna element provided on one surface of the dielectric substrate; and a feeder connected to one end of the antenna element, wherein the antenna element extends along a longitudinal direction thereof. is folded at least once so as to be substantially parallel Te folded portion is formed, and the other end side only is formed wider than the one end side Rutotomoni, ground on the back surface of the dielectric substrate conductor
Structure der is not provided Ru-chip mobile phone antenna. 2. The dielectric substrate is made of ceramics.
The antenna according to claim 1. 3. The antenna element according to claim 2, wherein said antenna element is substantially doubled.
3. The antenna according to claim 1, wherein the antenna is formed so as to be able to transmit and receive signals in two related frequency bands . 4. A mounting land made of a metal film and a power feeding land electrically connected to one end of the antenna element are provided at an end of a back surface of the dielectric substrate ,
The mounting land and power supply land allow direct
Antenna only structural der may mounted by bonding with Ru claim 1, wherein placing the surface. Wherein said connected antenna element and the other end portion electrically in the end portion of the rear surface of the dielectric substrate, according to claim 1 comprising adjusting land is provided comprising a metal film, 3
Or the antenna according to 4 . 6. A portable wireless device having a circuit board on which a wireless circuit is formed, and a resin housing covering the circuit board, wherein the antenna according to claim 1 is mounted on the circuit board. is Rutotomoni, Do also exist metal on the back side of the antenna
So that it can be transmitted and received from the back side
A portable wireless device formed on a mobile phone. 7. An adjusting element for adjusting a resonance frequency of the circuit board so that the antenna is electrically connected to the adjusting land or the feeding portion of the antenna according to claim 5. Claim that is provided
6. The portable wireless device according to 6 . 8. Except for the vicinity of the antenna on the circuit board.
Ground conductor is provided, and impedance due to the influence of the ground conductor is provided.
To prevent a change in-impedance, the contact between the feeding portion side
Between the circuit element in the part where the ground conductor was provided ,
8. The portable wireless device according to claim 6, wherein a transmission line of approximately 50Ω for impedance adjustment is provided.