Portable radio unit

A radio unit, portable technology, applied in the direction of wireless communication, electrical components, slender active unit end feed, etc., can solve the problems of complicated mechanism, lower antenna efficiency, inconvenient feeder setting, etc.

Inactive Publication Date: 2002-09-18
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the wireless communication device disclosed in the above document, there are substantially two antennas on the cover, and the combination of these antennas may lower the

Method used

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  • Portable radio unit
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0038] Such as Figure 1A As shown, the portable radio unit 1 has a casing 2 (ground conductor), a cover (flip cover) 3 that can be opened and closed freely, a dipole antenna 5, a first and a second feeder 4a, 4b, an RF (Radio Frequency) power supply 1 and the second power supply 6a, 6b and the cover opening and closing detection device 7.

[0039] The cover 3 is openably and closably attached to the case 2, is made of, for example, a dielectric material such as an organic polymer, and has a dipole antenna 5 inside. The dipole antenna 5 has a length L1 of one-half wavelength (λ / 2), and extends in a direction perpendicular to the long direction of the housing 2 . As a result, when the housing 2 is tilted to make a call, the polarized wave component perpendicular to the ground increases, and the consistency with the base station of the vertically polarized wave becomes better.

[0040] The first and second feeding lines 4a, 4b and the first and second power sources 6a, 6b oper...

Embodiment approach 2

[0049] Next, use Figure 3A and 3B Embodiment 2 of the present invention and its improvements will be described.

[0050] Such as Figure 3A As shown, in Embodiment 2 of the present invention, the tip of the dipole antenna 5 is bent. Thereby, the physical length of the dipole antenna 5 can be shortened, and the dipole antenna 5 can be made more compact. other structures and Figure 1A The same applies to the first embodiment shown.

[0051] In addition, as shown in FIG. 3 , the top end of the dipole antenna 5 can also be bent into a serpentine shape. In this case also, the same effect can be obtained.

Embodiment approach 3

[0053] Next, use Figure 4A and Figure 4B Embodiment 3 of the present invention will be described. Such as Figure 4A As shown, in Embodiment 3, the coaxial line 9 is used as the feeder. The coaxial line 9 has an outer conductor 9a and an inner conductor 9b, and the outer conductor 9a is short-circuited to the case. That is, the outer conductor 9a is grounded.

[0054] Coaxial lines 9, such as Figure 4B As shown, it is arranged to be spaced from the casing, and one end of the external conductor 9a is short-circuited with the casing 2 at the short-circuit point 11. In addition, if Figure 4A and Figure 4B As shown, the interval L3 between the feeding point 10 of the outer conductor 9a and the above-mentioned short-circuit point 11 is approximately λ / 4. Thereby, since the estimated impedance from the power source 6 a to the short-circuit point 11 becomes infinite, it is possible to suppress the influence of the short-circuit point 11 on the impedance of the feeding po...

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PUM

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Abstract

In one aspect of the present invention, a portable radio (1) is provided with: a casing (2); a cover (3) attached to casing (2) so as to be freely opened and closed; a dipole antenna (5) attached to cover (3); an open-close detection means (7) for detecting the opening/closing of cover (3); a power supply means (4a, 4b, 6a, 6b) for supplying power to dipole antenna (5); and a power supply control means (8) for controlling power supply means (4a, 4b, 6a, 6b) based upon the opening/closing of cover (3). In another aspect thereof, the portable radio (1) is provided with a resonator (9) installed in casing (2), and resonator (9) is placed at a position close to dipole antenna (5) when cover (3) is closed. In still another aspect thereof, in response to the opening/closing of cover (3), first and second matching circuits (12, 13), power supply means (6) and dipole antenna (5) are switched and connected. <IMAGE>

Description

field of invention [0001] The present invention relates to a portable radio unit, and more particularly to a portable radio unit having an antenna provided on an openable and closable housing portion (hereinafter referred to as a cover). Background technique [0002] Japanese Unexamined Patent Publication No. 8-186518 discloses an example of a wireless communication device having an antenna on an openable cover. [0003] The aforementioned cover antenna has first and second components, the first component is tuned to the operating frequency of the receiving and transmitting circuit when the cover is opened, and the second component is tuned to the operating frequency of the receiving and transmitting circuit when the cover is closed. Therefore, regardless of whether the cover is open or closed, the cover antenna can be tuned to the operating frequency of the receiving and transmitting circuits. [0004] However, in the wireless communication device ...

Claims

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Application Information

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IPC IPC(8): H01Q1/08H01Q1/24H01Q9/28H01Q9/42H01Q21/28H04B1/38H04W88/02
CPCH01Q9/42H01Q1/084H01Q1/243H01Q9/285H01Q21/28H04B1/3833
Inventor 东海林英明今西康人深泽彻大岭裕幸
Owner MITSUBISHI ELECTRIC CORP
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