JPS6234404A - Antenna for radio equipment - Google Patents

Abstract

PURPOSE:To reduce the size of radio equipment by forming a slot antenna in a metallic radio equipment housing and storing radio equipment circuit parts such as a transmission and a reception part in the radio equipment housing which is partitioned by the slot. CONSTITUTION:A receiver 3 and a transmitter 4 are provided on the front surface 1a of the metallic radio equipment housing 1 and the slot 2 is formed on the back surface 1b. The slot 2 is about a quarter as long as wavelength and fed with electricity so as to operate as a slot antenna. The radio equipment housing 1 is divided by the slot 2 into an upper and a lower part to store, for example, the receiving circuit part 5 in the upper part and the transmitting circuit 6, a power source part, etc., in the lower part.

Description

[Detailed Description of the Invention] [Summary] A slot antenna is formed in a metal radio casing, and radio circuit parts such as a transmitter and a receiver are installed in each of the radio casings separated by slots. This is intended to make the radio device more compact.

[Industrial application field]

TECHNICAL FIELD The present invention relates to a miniaturized antenna for a radio device such as a portable radio telephone.

[Conventional technology]

The radio device has, for example, the configuration shown in FIG.
The signal is modulated to Hz and applied to the power amplifier 19. The signal amplified by the power amplifier 19 is applied to the antenna 11 via the duplexer 12 and transmitted. Also antenna 11
The received signal is applied to the receiving section 13 via the duplexer 12. This receiving section 13 demodulates the signal to become a low frequency signal, which is added to the low frequency processing section 14 where it is amplified and placed on the receiver 1.
Added to 5.

When such a radio device is configured to be portable, a 1/4 wavelength whip antenna is often used as the antenna 11. However, this whip antenna has the disadvantage that it protrudes from the radio casing and obstructs operation.

Therefore, recently, an inverted F antenna using a plate-shaped radiating element has been adopted. This inverted F antenna uses a metal radio casing as a grounding plate, arranges a plate-shaped radiating element parallel to the radio casing, and connects and fixes one end of the plate-shaped radiating element to the radio casing. A power feeding point is provided at a predetermined position between the tip and the grounding part.

Since this inverted F antenna can receive horizontal and vertical polarization components, the plane of polarization rotates when used in urban areas, making it a suitable antenna for radio equipment.

[Problem that the invention seeks to solve]

The above-mentioned inverted F antenna has a plate-shaped radiating element arranged parallel to the top or side surface of a metal radio device casing, and the center or corner of one side of the plate-shaped radiating element is fixed to the non-VA device casing. death,
Power is supplied between the radio device housing and the plate-shaped radiating element, and if the thickness of the plate-shaped radiating element is made too thick, the advantage of miniaturization will be lost. Further, the antenna placement position is limited to the top surface or side surface of the radio device housing.

An object of the present invention is to enable the position of the antenna to be relatively freely selected without increasing the size of the radio device housing.

[Means for solving problems]

The radio antenna of the present invention will be described with reference to FIG.
Slots 2 of about 4 wavelengths are formed to supply power to the wireless terminal 2, and radio circuit parts such as a transmitting section and a receiving section are housed in the radio housing 1 separated by the slots 2. A receiving circuit section 5 corresponding to the telephone receiver 3 and a transmitting circuit section 6 corresponding to the transmitter 4 can be respectively housed therein.

[Effect]

By forming the slot 2 in the radio device housing 1, it is equivalent to increasing the thickness of the radiating element, and the impedance matching range of the antenna can be widened.Also, the radio device circuit section can be separated. Since it can be stored, coupling between the radio circuit parts can be prevented.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view of an embodiment of the present invention, in which a receiver 3 and a transmitter 4 are provided on the front surface 1a of a metal radio housing 1, and a slot 2 is formed on the rear surface 1b. The length of this slot 2 is approximately 1/4 wavelength. Power is fed so that this slot 2 acts as a slot antenna, and although the feed point is not shown, it is selected so that impedance matching can be achieved.

This slot 2 divides the radio housing 1 into upper and lower parts. For example, the upper part has the receiving section 13. A receiving circuit section 5 consisting of a low frequency processing section 14 and the like is housed, and the lower part includes a duplexer 12. The force amplifier 19. It houses a transmitting circuit section 6 including a transmitting section 18, a low frequency processing section 17, etc., a power supply section, and the like.

FIG. 2 is a schematic perspective view of another embodiment of the present invention, showing a case in which a slot 2 is formed on the upper surface 1c of a metal radio device casing l, the length of which is about 1/4 wavelength, and impedance matching. It supplies power so that it can be used. Also, radio housing 1
A receiver 3 and a transmitter 4 are provided on the front surface 1a of the
In the radio housing 1 divided by the slot 2, for example, between the slot 2 and the front surface 1a, a receiving circuit section 7 such as the low frequency processing section 14 shown in FIG. 3 is housed, and between the slot 2 and the rear surface. A high-frequency circuit section 9 such as a duplexer 12 shown in FIG. 3 is housed between the high-frequency circuit section 17.1b shown in FIG. 3, and a low-frequency processing section 17.1b shown in FIG. Transmission section 18 This is a section that houses a transmission circuit section 8 including a power amplifier 19 and the like, a power supply section, and the like.

The position of the slot 2 formed in the radio device housing 1 can be arbitrarily selected in consideration of the circuit section etc. to be housed inside. Further, in order to reinforce the radio device housing 1 divided by the slots 2, it is also possible to fill the slots 2 with a dielectric material.

〔Effect of the invention〕

As explained above, the present invention provides a metal radio housing 1.
A slot 2 with a length of about 1/4 wavelength is formed in the
This corresponds to increasing the thickness of the radiating element, which has the advantage of widening the impedance matching range. Moreover, since there is no part protruding from the radio device housing l, it is possible to provide a small antenna with good operability.

Furthermore, by accommodating circuit parts that need to be prevented from coupling in the radio housing 1 separated by the slots 2, the operation of the radio can be stabilized.

[Brief explanation of the drawing]

1 and 2 are schematic perspective views of different embodiments of the present invention, and FIG. 3 is a block diagram of a radio device. Reference numeral 1 is a radio housing, 1a is a front surface, 1b is a rear surface, ]C is a top surface, 2 is a slot, 3 is a receiver, 4 is a transmitter, and 5 to 9 are circuit sections.

Claims (1)

[Claims] At a predetermined position of the metal radio casing (1), the length is 1/4.
A slot (2) about the wavelength is formed, and the slot (2)
A wireless device antenna characterized in that a wireless device circuit section is housed in each of the wireless device casings (1) separated by the slot (2).