JPH08204420A - Portable radio equipment - Google Patents

Abstract

PURPOSE: To prevent the characteristic of a helical antenna part from deteriorating by housing an antenna part in a cabinet and comprising a coaxial line in which a terminal part is short-circuited setting a cylindrical antenna part as an external conductor and a bar shape antenna part as an internal conductor. CONSTITUTION: A contact 423 for feed is connected to the base terminal side of the helical antenna part 330 in a state in which the cylindrical antenna part 310 and the bar shape antenna part 320 are housed in the cabinet 400 and only the helical antenna part 330 is arranged at the outside of the cabinet 400. In such a case, a contact 424 for ground is connected to the cylindrical antenna part 310, and the part of the bar shape antenna part 320 except for a part in which its base terminal side is short-circuited to the base terminal side of the cylindrical antenna part 310 is housed in the cylindrical antenna part in a state in which it is insulated by the cylindrical antenna part 310, therefore, the coaxial line whose terminal part setting the bar shape antenna part 320 as the internal conductor and the cylindrical antenna part 310 as the external conductor is short-circuited is comprised. Therefore, high impedance is obtained at cylindrical and bar shape antenna sides observed from the contact 423 for feed, and no wave interference with a circuit in the cabinet, etc., occurs.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a portable radio apparatus having a two-stage telescopic antenna with a helical antenna section.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional mobile phone having a telescopic antenna. In this mobile phone, the device housing 1
The antenna 200 attached to the antenna 00 is composed of a tubular antenna portion 210, a rod-shaped antenna portion 220, and a helical antenna portion 230.
0 is slidably held by the antenna mounting portion 110 of the housing 100, and the rod-shaped antenna portion 220 is the cylindrical antenna portion 2.
Helical antenna unit 2 is slidably held by 10
30 is connected in series to the tip of the rod-shaped antenna part 220. Further, the power supply contact spring 121 of the wireless circuit unit 120 provided in the housing 100 is electrically connected to the tubular portion 111 of the antenna mounting portion 110, and the power supply contact spring 121 is connected to the matching circuit 122. The signal source 123 is connected to the matching circuit 122.

Then, during transmission and reception, as shown in FIG. 5B, the antenna 200 is used as a stretched state to form a highly sensitive antenna, and when the apparatus is not used,
As shown in FIG. 5A, by housing the tubular antenna unit 210 and the rod-shaped antenna unit 220 in the housing 100, the entire device has a compact shape that is convenient for carrying and the elongated tubular antenna unit 210. And rod-shaped antenna unit 2
20 is prevented from being damaged.

Further, even in the antenna housed state shown in FIG. 5A, the helical antenna section 230 projects to the outside of the housing 100, and this helical antenna section 230 is used as an antenna in the standby state of the apparatus. However, if the power feeding contact spring 121 is simply connected to the helical antenna part 230, the electrically and integrally cylindrical and rod-shaped antenna parts 210 and 220 and the helical antenna part 230 are connected to each other. Since it is connected to 121 in parallel, the electric power is divided into two, so that the performance of helical antenna section 230 deteriorates. Further, the cylindrical and rod-shaped antenna units 210 and 220 housed in the housing 100 affect other built-in antennas and electronic circuits provided in the housing 100.

Therefore, a metal cylinder 130 connected to the ground is provided in the housing 100, and the cylindrical and rod-shaped antenna units 210 and 220 housed in the housing 100 are inserted into the metal cylinder 130. In addition, the antenna parts 210 and 220 are at the position where the length is ¼ of the wavelength λ of the radio wave,
The base end portion 2 of the tubular antenna portion 210 so as to be short-circuited with 30
11 is in contact with the bottom 131 of the metal tube 130. As a result, a coaxial structure in which the metal cylinder 130 is used as the outer conductor and the antenna portions 210 and 220 are used as the inner conductor and the ends of the length λ / 4 are short-circuited is configured.
The antenna parts 210 and 220 viewed from 1 have a high impedance, so that most of the electric power is supplied to the helical antenna part 230, and the deterioration of the characteristics of the helical antenna part 230 can be prevented. Also, the metal tube 1
Since 30 plays a role of a shield, the antenna unit 21
It was also possible to prevent radio wave interference between 0, 220 and the internal circuit.

However, according to the above structure, the housing 1
Since the metal cylinder 130 having an outer diameter capable of accommodating the cylindrical antenna portion 210 must be provided in the metal cylinder 00,
It takes a lot of work to attach 0, and the metal cylinder 130
However, there is a problem in that the housing 100 becomes large by the amount occupied by. Further, it is also possible to apply a conductive coating to the inside of the housing 100 instead of the metal cylinder 130 to form the housing portion of the cylindrical antenna portion 210, but even if such a method is used, the conductive coating is costly. In addition, there is no change in that the size of the housing 100 is increased by the amount occupied by the storage portion.

[0007]

As described above, in the conventional portable radio apparatus, in order to secure the characteristics of the helical antenna portion when the antenna is accommodated, a metal for accommodating the cylindrical and rod-shaped antenna portions is used. Since the cylinder and the like are provided in the housing, there is a problem that mounting of the metal cylinder and the like is complicated, and the device is upsized to the extent that the metal cylinder and the like occupy.

The present invention has been made to solve the above-mentioned conventional drawbacks, and reduces the characteristics of the helical antenna portion even when the cylindrical and rod-shaped antenna portions are housed in the housing. It is an object of the present invention to provide a portable wireless device that does not have to have a cylindrical or rod-shaped antenna part housed in a conductor such as a metal cylinder connected to the ground.

[0009]

According to a first aspect of the present invention, there is provided a portable radio device having a casing of a device having a radio circuit section, and a base end side protruding from a position housed in the casing to the outside of the casing. A tubular antenna unit slidably attached to the casing to a position held in the casing, and a tubular antenna protruding from the tip end side of the tubular antenna unit from a position housed in the tubular antenna unit. The rod-shaped antenna unit slidably attached to the cylindrical antenna unit to the position where the base end side is held at the tip side of the unit and electrically connected, and the rod-shaped antenna unit provided at the tip of the rod-shaped antenna unit is electrically connected. Electrically connected to the helical antenna part and the cylindrical antenna part provided in the wireless circuit part and electrically connected to the base end side of the cylindrical antenna part when the cylindrical antenna part is projected from the housing. Ann A power supply contact electrically connected to the proximal end side of the helical antenna unit when the antenna unit and the rod-shaped antenna unit are housed in the casing; and the tube provided in the wireless circuit unit and accommodated in the casing. With a ground contact electrically connected to the antenna unit, in a state where the tubular antenna unit and the rod-shaped antenna unit are stored in the housing, the rod-shaped antenna unit is stored in the tubular antenna unit, In addition, the base end side is insulated from the tubular antenna unit except that it is short-circuited to the base end side of the tubular antenna unit.

A portable radio apparatus according to a second aspect of the present invention is the portable radio device according to the first aspect, wherein the length of the rod-shaped antenna portion housed in the tubular antenna portion is such that the tubular antenna portion and the rod-shaped antenna portion are housed in the housing. , (2m + 1) λ / 4 (m is zero or a positive integer), where λ is the wavelength of the radio wave.

According to a third aspect of the present invention, there is provided a portable wireless device, which has a housing of a device having a wireless circuit portion, and a housing housed in the housing. A cylindrical antenna part slidably attached to the housing, and a cylindrical antenna part projecting from the tip end side of the cylindrical antenna part from the position housed in the cylindrical antenna part and mounted on the tip end side of the cylindrical antenna part. A rod-shaped antenna unit slidably attached to the cylindrical antenna unit to a position where the end side is held and electrically connected, and a helical electrically connected to the rod-shaped antenna unit provided at the tip of the rod-shaped antenna unit. The antenna part and the cylindrical antenna part and the rod-shaped antenna provided on the wireless circuit part are in electrical contact with the base end side of the cylindrical antenna part when the cylindrical antenna part is projected from the housing. The feeding contact electrically connected to the base end side of the helical antenna portion when the tenor portion is accommodated in the housing, and the tubular antenna portion provided in the wireless circuit portion and accommodated in the housing. In a state in which the cylindrical antenna unit and the rod-shaped antenna unit are housed in the housing, the rod-shaped antenna unit is housed in the tubular antenna unit, and It is insulated from the antenna section.

A portable radio apparatus according to a fourth aspect of the present invention is the portable radio device according to the third aspect, wherein the length of the rod-shaped antenna portion housed in the tubular antenna portion is such that the tubular antenna portion and the rod-shaped antenna portion are housed in the housing. , Λ / 2 (n is a positive integer), where λ is the wavelength of the radio wave.

According to a fifth aspect of the present invention, in the portable radio apparatus according to the first or third aspect of the invention, a dielectric is provided between the cylindrical antenna section and the rod-shaped antenna section housed in the cylindrical antenna section. ing.

[0014]

In the invention according to claim 1, when the antenna composed of the cylindrical antenna part, the rod-shaped antenna part and the helical antenna part is extended, the feeding contact is electrically connected to the base end side of the cylindrical antenna part, An antenna having an effective length, which is the sum of the length of the cylindrical antenna unit, the length of the rod-shaped antenna unit, and the effective length of the helical antenna unit, is formed outside the housing. Further, in a state where the cylindrical antenna portion and the rod-shaped antenna portion are housed in the housing and only the helical antenna portion is arranged outside the housing, the power feeding contact is connected to the proximal end side of the helical antenna portion. In this case, the ground contact is connected to the tubular antenna part, and the rod-shaped antenna part is tubular in a state of being insulated from the tubular antenna part, except that the base end side is short-circuited to the base end side of the tubular antenna part. Since the antenna is housed in the antenna part, a coaxial line with the cylindrical antenna part as the outer conductor and the rod-shaped antenna part as the inner conductor is short-circuited at the ends, and the cylindrical and rod-shaped antennas are seen from the feeding contact. The part side becomes high impedance.

In the invention according to claim 2, the invention according to claim 1
, The length of the coaxial line is (2m + 1) λ / 4, and as shown in FIG. 3 (a), in the coaxial line whose ends are short-circuited, its impedance Z is (2m + 1) λ / 4. Is the largest, and the impedance on the side of the cylindrical and rod antennas seen from the feeding contact is the largest.

The invention according to claim 3 has substantially the same structure as the invention according to claim 1, but the rod-shaped antenna portion is tubular when the tubular antenna portion and the rod-shaped antenna portion are housed in a housing. Since it is completely insulated from the antenna part and housed in the cylindrical antenna part, the cylindrical antenna part is an outer conductor,
A coaxial line having an open end with the rod-shaped antenna portion as the inner conductor is configured, and the cylindrical and rod-shaped antenna portion sides viewed from the feeding contact point have high impedance.

Further, in the invention according to claim 4, the invention according to claim 3
In Fig. 3, the length of the coaxial line is nλ / 2.
As shown in (b), in a coaxial line with an open end, the impedance Z becomes the largest at a length of nλ / 2, so the impedance on the side of the cylindrical and rod antennas seen from the feeding contact is Will be the largest.

In the invention according to claim 5, the invention according to claim 1
Alternatively, in the third aspect of the present invention, a dielectric is provided between the tubular antenna portion and the rod-shaped antenna portion housed in the tubular antenna portion. In this case, the following relationship occurs when the dielectric is put in the coaxial structure. First, the relational expression between the radio wave propagation velocity and the relative permittivity is expressed as follows. V = Vo / (εr) ^1/2 where Vo is the propagation velocity in free space and is approximately 3 × 1.
0 ⁸ m / sec, εr represents the relative permittivity of the dielectric between the inner conductor and the outer conductor of the coaxial line. The relationship between the wavelength and the propagation velocity in the coaxial line is expressed as follows. V = f · λg (where f is the frequency of the radio wave and λg is the wavelength in the coaxial line). Therefore, λg = Vo / f (εr) ^1/2 = A / (εr)
^1/2 (A = Vo / f) Therefore, by inserting a dielectric between the cylindrical antenna part and the rod-shaped antenna part, the length of the coaxial line having the maximum impedance can be shortened.

[0019]

Embodiments of the present invention will now be described in detail with reference to FIGS.

FIG. 1 is a diagram showing a first embodiment.
FIG. 1A is a sectional view of a main part of the portable wireless device when the antenna is housed, and FIG. 1B is a sectional view of a main part of the portable wireless device when the antenna is extended.

The portable radio apparatus of this example is a mobile phone having a two-stage telescopic antenna, and the antenna 300 is shown in FIG.
As shown in FIG. 1A, most of the housing is accommodated in the housing 400 of the apparatus, and as shown in FIG. 1B, it can be expanded and contracted to the outside of the housing 400.

The antenna 300 has a cylindrical antenna portion 31.
0, a rod-shaped antenna portion 320 slidably held by the tubular antenna portion 310, and a helical antenna portion 330 fixed to the tip 321 side of the rod-shaped antenna portion 320.

The cylindrical antenna part 310 is formed of a metal cylinder having a length of L1, a hole is formed at the tip 311 and the rod-shaped antenna part 320 is inserted into this hole.
Further, a metallic stopper portion 313 having an outer diameter slightly larger than the outer diameter of the tubular antenna portion 310 is fixed to the proximal end 312 of the tubular antenna portion 310, and the stopper portion fitted in the proximal end 312 is fixed. The receiving portion 313a of 313 is formed with a recess into which the base end 322 of the rod-shaped antenna portion 320 is fitted. In addition, the tip 31 of the cylindrical antenna unit 310
A receiving portion 314 for holding the convex portion 324 on the base end 322 side of the rod-shaped antenna portion 320 is protrudingly provided on the inner wall on the first side.

The rod-shaped antenna portion 320 is formed of a metal rod, and the convex portion 324 is formed near the base end 322 side. An insulating coating is provided on the peripheral surface of the rod-shaped antenna portion 320 except for the base end 322 and the convex portion 324. Therefore, as shown in FIG.
In the state where the rod-shaped antenna unit 320 is housed in the tubular antenna unit 310, the tubular antenna unit 310 and the rod-shaped antenna unit 320 are electrically connected except that the base end 322 of the rod-shaped antenna unit 320 is fitted and electrically connected to the receiving unit 313a. Electrically isolated. Also,
As shown in FIG. 1B, when the rod-shaped antenna part 320 is pulled out from the tip 311 of the cylindrical antenna part 310, the convex part 324 thereof is the receiving part 31 of the cylindrical antenna part 310.
4, the rod-shaped antenna portion 320 is electrically connected to the tubular antenna portion 310 via the convex portion 324 and the receiving portion 314. Further, a connection portion 331 having the same thickness as the outer diameter of the cylindrical antenna portion 310 is provided on the base end side of the helical antenna portion 330, and the tip 321 of the rod-shaped antenna portion 320 is the base end of this connection portion 331. It is fixed to and electrically connected.

The antenna 300 has a cylindrical antenna portion 31.
It is inserted into an antenna mounting bracket 410 having a hole with an inner diameter similar to the outer diameter of 0.
Is screwed into the housing 400 of the apparatus, so that the housing 40
It is attached to 0. Also, the antenna mounting bracket 41
The lower end side of 0 is a contactor 411 having a spring property. Therefore, when the antenna 300 is pushed into the housing 400 as shown in FIG.
1 is electrically connected to the contact 411, and when the antenna 300 is pulled out as shown in FIG. 1B, the base end 312 of the tubular antenna portion 310 is electrically connected to the contact 411. It Since the stopper portion 313 is in contact with the end portion of the contact 411, the antenna 300 does not come out.

On the other hand, the radio circuit section 420 provided in the housing 400 has a signal source 421 and a matching circuit 422 connected to the signal source 421, and the power feeding connected to the matching circuit 422. The contact spring 423 contacts the contact 411 and is electrically connected thereto. Also,
A ground contact spring 424, which is connected to the ground, is disposed below the power supply contact spring 423. When the antenna 300 is housed, the ground contact spring 424 contacts the cylindrical antenna portion 310 to cause electric power. Connected.

Since the configuration is as described above, during transmission and reception, as shown in FIG.
When the antenna 300 is pulled out, the base end 312 of the cylindrical antenna part 310 of the antenna 300 is fed by the feeding contact spring 42.
3 and is a highly sensitive antenna having an effective length that is the sum of the length of the cylindrical antenna unit 310, the length of the rod-shaped antenna unit 320, and the effective length of the helical antenna unit 330. When the device is not used, as shown in FIG. 1A, the cylindrical antenna unit 310 and the rod-shaped antenna unit 3 are used.
By housing 20 in the housing 400, it is possible to make the entire device compact and convenient for carrying, and to prevent external force from acting on the elongated cylindrical antenna portion 310 and the rod-shaped antenna portion 320.

On the other hand, even in the antenna housed state shown in FIG. 1A, a feeding contact spring 423 is connected to the connecting portion 331 of the helical antenna portion 330 protruding from the housing 400. It can be used as a standby antenna. In this case, the ground contact spring 424 is connected to the cylindrical antenna unit 310,
The rod-shaped antenna unit 310 is housed in the tubular antenna unit 310 in a state of being insulated from the tubular antenna unit 310 except that the proximal end 322 of the rod-shaped antenna unit 310 is short-circuited to the proximal end 312 side of the tubular antenna unit 310. L1 of the antenna part 310
Is 1/4 of the wavelength λ of the radio wave. Therefore,
The cylindrical antenna portion 310 is an outer conductor, and the rod-shaped antenna portion 320
A coaxial line is constructed in which the end portion having a length of λ / 4 is short-circuited, and the cylindrical and rod-shaped antenna portions 310, 32 viewed from the feeding contact spring 423 are seen, as shown in FIG.
The impedance Z on the 0 side becomes maximum. Therefore, the helical antenna section 330 can be efficiently used as an external antenna without being affected by the cylindrical antenna section 310 and the rod-shaped antenna section 320. Further, since the tubular antenna unit 310 is connected to the ground, radio wave interference does not occur with other circuit units inside the housing 400.

FIG. 2 is a sectional view of the essential parts of a portable radio apparatus according to the second embodiment of the present invention. This example has the same configuration as the first example except that the length L2 of the cylindrical antenna portion 310 is 1/2 of the wavelength λ of the radio wave and an insulator is used as the stopper portion 313. According to this example, when the antenna is housed, a coaxial line having a cylindrical antenna part 310 as an outer conductor and a rod-shaped antenna part 320 as an inner conductor and having an open end with a length of λ / 2 is configured. As shown in FIG. 3 (b), the impedance Z on the side of the cylindrical and rod-shaped antenna units 310 and 320 viewed from the feeding contact spring 423 becomes maximum. Other functions and effects are similar to those of the first embodiment.

FIG. 4 is a sectional view of the essential parts of a portable radio apparatus showing a third embodiment of the present invention. This example is similar to the first example except that the length of the cylindrical antenna part 310 is L3 and the dielectric 340 is inserted in the gap between the cylindrical antenna part 310 and the rod-shaped antenna part 320. is there. According to this example, when the antenna is stored, the cylindrical antenna unit 310 is used.
Can be used as an outer conductor and the rod-shaped antenna as an inner conductor to form a coaxial line in which a dielectric is provided between the outer conductor and the inner conductor. Therefore, the wavelength in the coaxial line can be made shorter than in the case of the free space, and the length of the coaxial line having the maximum impedance is obtained. Therefore, the length L of the cylindrical antenna unit 310 is L.
3 can be made shorter than the length L1 of the cylindrical antenna portion 310 of the first embodiment. The cylindrical antenna unit 310
The length of the cylindrical antenna part 310 depends on the size of the housing 400. For example, the length L2 of the cylindrical antenna part 310 should be shortened by applying this example to the second embodiment. The length of the cylindrical antenna unit 310 may be adjusted by.

[0031]

As described above, in the invention according to claim 1, when the tubular antenna portion and the rod-shaped antenna portion are housed in the housing, the end having the tubular antenna portion as the outer conductor and the rod-shaped antenna portion as the inner conductor. A coaxial line having a short-circuited portion is configured, and the cylindrical and rod-shaped antenna portion side viewed from the feeding contact has high impedance. Therefore, the characteristic of the helical antenna part as an antenna does not have to be deteriorated without providing a metal tube or the like for accommodating the cylindrical antenna part inside the housing as in the conventional case. No radio wave interference occurs with the rod-shaped antenna section.

Further, in the invention according to claim 2,
In, since the coaxial line has a length of (2m + 1) λ / 4, the impedance on the side of the cylindrical and rod-shaped antennas becomes maximum.

Further, in the invention according to claim 3, a coaxial line having an open end with the cylindrical antenna portion as an outer conductor and the rod-shaped antenna portion as an inner conductor is constituted, and the cylindrical and rod-shaped antennas as viewed from the feeding contact are formed. Since the part has high impedance,
The same effect as the invention according to claim 1 is produced.

Further, in the invention according to claim 4, the invention according to claim 3
Since the coaxial line is nλ / 2, the impedance on the side of the cylindrical and rod antenna parts becomes maximum.

Further, in the invention according to claim 5, the invention according to claim 1
Or 3, since the dielectric is provided between the cylindrical antenna part and the rod-shaped antenna part, the wavelength of the radio wave in the coaxial line can be made shorter than in the case of free space, so that the impedance is maximum. The length of the coaxial line becomes, and therefore, the length of the cylindrical antenna part can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a portable wireless device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a portable wireless device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing the relationship between the length of a coaxial line and impedance.

FIG. 4 is a cross-sectional view of a main part of a portable wireless device according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part of a conventional portable wireless device.

[Explanation of symbols]

300 Antenna 310 Cylindrical Antenna Part 320 Rod Antenna Part 330 Helical Antenna Part 340 Dielectric 400 Housing 420 Radio Circuit Part 423 Power Supply Contact Spring 424 Ground Contact Spring

Claims (5)

[Claims] 1. A housing of a device having a wireless circuit section, and the housing slidably extending from a position housed in the housing to a position where a base end side is held by the housing. The cylindrical antenna part attached to the cylindrical antenna part and the cylindrical antenna part protruding from the tip end side of the cylindrical antenna part from the position housed in the cylindrical antenna part, and the proximal end side is held and electrically connected to the tip end side of the cylindrical antenna part. And a rod-shaped antenna part that is slidably attached to this cylindrical antenna part
A helical antenna portion provided at the tip of the rod-shaped antenna portion and electrically connected to the rod-shaped antenna portion, and the cylindrical antenna portion provided in the wireless circuit portion when the cylindrical antenna portion is projected from the housing. A power supply contact electrically connected to the base end side of the antenna unit and electrically connected to the base end side of the helical antenna unit when the cylindrical antenna unit and the rod-shaped antenna unit are housed in the housing; In a state in which the cylindrical antenna unit and the rod-shaped antenna unit are housed in the housing, the ground antenna is provided in the wireless circuit unit and electrically connected to the cylindrical antenna unit housed in the housing. The rod-shaped antenna part is housed in the tubular antenna part, and is insulated from the tubular antenna part except that the base end side is short-circuited to the base end side of the tubular antenna part. Portable radio apparatus according to symptoms. 2. The length of the rod-shaped antenna portion housed in the tubular antenna portion when the tubular antenna portion and the rod-shaped antenna portion are housed in the housing is (2m + 1) λ when the wavelength of the radio wave is λ. 4. The portable wireless device according to claim 1, wherein / 4 (m is zero or a positive integer). 3. A housing of an apparatus having a wireless circuit section, and the housing slidably protruding from a position housed in the housing to a position where a base end side is held by the housing. The cylindrical antenna part attached to the cylindrical antenna part is projected from the tip end side of the cylindrical antenna part from a position housed in the cylindrical antenna part, and the proximal end side is held and electrically connected to the tip end side of the cylindrical antenna part. The rod-shaped antenna unit slidably attached to the cylindrical antenna unit, the helical antenna unit provided at the tip of the rod-shaped antenna unit and electrically connected to the rod-shaped antenna unit, and the wireless circuit unit. When the tubular antenna unit and the rod-shaped antenna unit are electrically connected to the base end side of the tubular antenna unit when the provided tubular antenna unit is projected from the casing, and the tubular antenna unit and the rod-shaped antenna unit are housed in the casing. A power supply contact electrically connected to the base end side of the helical antenna section, and a ground contact electrically connected to the tubular antenna section provided in the wireless circuit section and housed in the housing. In the state where the tubular antenna portion and the rod-shaped antenna portion are housed in the housing, the rod-shaped antenna portion is housed in the tubular antenna portion and is insulated from the tubular antenna portion. A portable wireless device characterized by the above. 4. The length of the rod-shaped antenna portion housed in the tubular antenna portion when the tubular antenna portion and the rod-shaped antenna portion are housed in a housing is nλ / 2 (where the wavelength of the radio wave is λ). The portable wireless device according to claim 3, wherein n is a positive integer. 5. The portable radio according to claim 1, wherein a dielectric is provided between the cylindrical antenna part and the rod-shaped antenna part housed in the cylindrical antenna part. apparatus.