JPH09167907A - Antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna element with a light emitting element without affecting antenna performance and speech quality. SOLUTION: The wiring 7 connecting an LED 3 and the circuit within a communication equipment body 1 is provided along the external surface on the opposite side of the side of the slot 4 of an antenna 2 by using the slot antenna composed by forming the slot 4 at the intermediate part of the antenna element 2 having a hollow structure. Because the high frequency current flowing in the antenna is concentrated on the slot 4 and the horizontal direction component is dominant, the high frequency current to be the cause of noise is not induced to the wiring 7 of the LED 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device, and more particularly to an antenna device in which a light emitting element is provided on the antenna.

[0002]

2. Description of the Related Art Some portable communication devices such as analog cordless telephones are provided with a light emitting element such as an LED (light emitting diode) at the tip of an antenna in order to notify that a call has arrived.

FIG. 4 shows a conventional structure of an antenna unit in a portable communication device of this type. In this antenna device, the wiring 32 from the high-frequency power feeding unit 31 is connected to the base end of the antenna element 30 formed of a metal hollow pipe, and the wiring 34 of the LED 33 provided at the tip of the antenna element 30 is It is connected through the antenna element 30 to a control circuit block 38 in the communication device. A choke coil 35 is provided in the middle of the wiring 34 of the LED 33 to attenuate the high frequency current from the antenna element 30.

[0004]

However, when the conventional structure shown in FIG. 4 is applied to a communication device in the quasi-microwave band, the general choke coil cannot completely remove the high frequency current during transmission. There is a problem in that the current will flow to parts other than the antenna part, such as the circuit board in the communication device, and the antenna performance will deteriorate.

In the case of a TDMA (time division multiple connection) type communication device, the current flowing into the communication control circuit through the wiring 34 of the LED 33 is, for example, PHS (personal).
In the case of a mobile phone of a handyphone system), noise of 400 Hz which is the burst frequency thereof is generated, so that the noise signal flows into the transmission / reception system and deteriorates the voice quality.

Further, as shown in FIG. 5, in the case of an antenna device using a helical antenna element 36 instead of the metal hollow pipe, the antenna is shortened and the flexibility is improved, but the helical antenna is used. Since the wiring 37 of the LED 33 exists as a metal conductor in the antenna element 36 in the shape of a circle, high-frequency current of the antenna element 36 is easily induced in the wiring 37. Therefore, the basic characteristics of the antenna are further deteriorated and the communication quality is deteriorated.

The present invention was devised to solve the above-mentioned problems of the prior art, and provides an antenna device in which a light emitting element is provided in the antenna element without affecting the antenna performance and the communication quality. The purpose is to

[0008]

In order to achieve the above object, the invention according to claim 1 is an antenna device in which a light emitting element is provided in an antenna protruding outside a communication device,
As the antenna, a slot antenna is used in which a slot is formed in the middle of an antenna element having a hollow structure, and the wiring connecting the light emitting element and a circuit in the communication device is provided on the outer surface of the antenna element so as to avoid the slot. It is characterized by being installed alongside.

According to the first aspect of the present invention, the high frequency current flowing in the antenna is concentrated in the slot portion, and the horizontal component is dominant. Therefore, the high frequency current is guided along the outer surface of the antenna element so as to avoid the slot. The high-frequency current is not induced in the wiring of the light-emitting element provided as above. Therefore, it is possible to realize the antenna device in which the light emitting element is provided in the antenna element without affecting the antenna performance and the call quality.

Here, the slot is an elongated hole formed in a part of one side of the intermediate portion of the antenna element, and is usually formed along the longitudinal direction of the antenna element. A high frequency power supply unit is arranged in this slot. As the light emitting element, L
ED (light emitting diode), LD (laser diode), EL (electroluminescence) element, etc. can be applied.

A second aspect of the present invention is based on the first aspect of the invention, wherein the wiring is provided along an outer surface of the antenna element opposite to the side where the slot is formed. Is characterized by.

According to the invention of claim 2, since the wiring of the light emitting element is arranged at a position behind the antenna element with respect to the slot, it is possible to prevent a high frequency current from being induced in the wiring of the light emitting element. It can be surely prevented.

According to a third aspect of the present invention, in an antenna device in which a light emitting element is provided on an antenna protruding to the outside of the communication device, the antenna is also used as a wiring connecting the light emitting element and a circuit in the communication device. Between the antenna and the circuit, a quarter-wave microstrip line whose one end is short-circuited to remove a high-frequency signal traveling from the antenna to the circuit is provided.

According to the third aspect of the present invention, since the antenna is also used as the wiring connecting the light emitting element provided in the antenna and the circuit in the communication device, a high frequency signal directed to the circuit in the communication device is induced. However, the high-frequency signal is completely removed by the quarter-wave microstrip line with one end short-circuited. Therefore, it is possible to realize the antenna device in which the antenna is provided with the light emitting element without affecting the antenna performance and the call quality.

The invention according to a fourth aspect is based on the device configuration according to the third aspect, and the antenna is composed of a plurality of linear antenna elements arranged in parallel with each other at a minute interval. I am trying.

According to the invention described in claim 4, an antenna device having a light emitting element is provided without impairing the performance of an antenna in which a plurality of linear antenna elements are arranged in parallel with each other with a minute gap therebetween. Can be realized. Here, each of the plurality of linear antenna elements corresponds to a so-called monopole antenna. Therefore, in this case, it is desirable to excite a plurality of antenna elements in the same phase so that they operate as if they were one monopole antenna.

A fifth aspect of the present invention is based on the device configuration according to the third aspect, and is characterized in that the antenna is composed of a plurality of spiral antenna elements arranged in parallel with each other at a minute interval. I am trying.

According to the invention described in claim 4, an antenna device having a light emitting element is provided without deteriorating the performance of an antenna in which a plurality of spiral antenna elements are arranged in parallel with each other with a minute gap therebetween. Can be realized. Here, each of the plurality of spiral antenna elements corresponds to a so-called helical antenna. Therefore, in this case, it is desirable to excite a plurality of antenna elements in the same phase so that they operate as if they were one helical antenna.

[0019]

Next, an embodiment of the present invention will be described.

[First Embodiment] FIGS. 1A and 1B show an example of an embodiment of an antenna device according to the present invention. FIG. 1A is a front view, FIG. 1B is a side view, and FIG. Is. In FIG. 1, reference numeral 1 is a housing of a mobile communication device, and an antenna element 2 is provided on an upper surface of the housing 1 so as to project. Antenna element 2
A so-called slot antenna in which a slot (long hole) 4 is formed along the longitudinal direction in the middle part of a metal cylinder is used for the above. The slot 4 of the antenna element 2 is provided with a high frequency power supply unit 5. A power supply line 6 that connects the high-frequency power supply unit 5 and a high-frequency circuit block (not shown) in the housing 1 is provided along the inner surface of the antenna element 2. A coaxial cable is used for the power supply line 6.

At the tip of the antenna element 2, an LED 3 is provided as a light emitting element. A wiring 7 connecting the LED 3 and a control circuit block (not shown) in the housing 1 is provided along the outer surface of the antenna element 2 opposite to the side where the slot 4 is formed. This wiring 7 is the case 1
Is guided into the housing 1 through a small hole formed in the upper surface of the
It is connected to the control circuit block.

According to the antenna device of the first embodiment configured as described above, the high frequency current flowing in the antenna element 2 is concentrated in the slot 4 portion, and the horizontal component is dominant, so that the antenna element is LED provided along the outer surface on the side opposite to the side on which the slot 4 is formed.
No high frequency current is induced in the wiring 7 of 3.

Therefore, according to the antenna device of this embodiment, since the antenna element 2 is provided with the LED 3 so as not to affect the antenna performance and the communication quality, the characteristic of the antenna device is not deteriorated. Communication can be performed.

In the above example, the coaxial cable is used as the power supply line 6 for supplying power to the high frequency power supply section 5, but a microstrip line may be used instead.

In the above example, the wiring 7 of the LED 3 is provided along the outer surface of the antenna element 2 opposite to the side where the slot 4 is formed, but the position of the wiring 7 of the LED 3 is shown. Need not be near the opening of slot 4.

The antenna element 2 may be a square pole or any other shape as long as it can form a slot antenna.

[Second Embodiment] FIG. 2 shows an antenna device according to a second embodiment of the present invention. The antenna device shown in the figure uses, as an antenna element, two linear conductor wires 11A and 11B protruding from the upper surface of the housing 12 of the portable communication device, and emits light at the tips of both conductor wires 11A and 11B. The LED 19 as an element is connected.

The two conductor wires 11A and 11B are arranged in parallel with each other with a minute interval so that they do not contact each other, and their lower ends are connected to the high-frequency power supply section 14 via the power supply wirings 13A and 13B. ing. High frequency power supply 1
Reference numeral 4 is connected to the high frequency circuit block via the power supply wiring 15. A high frequency bypass capacitor 16 is arranged between the power supply wirings 13A and 13B in accordance with the coupling capacitance between the two conductor wires 11A and 11B, and the two linear conductor wires 11A and 11B are in phase with each other. Excited at, as if
It is designed to operate like a monopole antenna in a book.

Further, the above-mentioned two conductor wires 11A and 11B
Are connected to one ends of the quarter-wavelength microstrip lines 17A and 17B via power supply wirings 13A and 13B, respectively, and the other ends of the microstrip lines 17A and 17B are connected to high frequency bypass capacitors 18A and 18B, respectively.
It is connected to the high frequency ground via B. The side from the high frequency power supply 14 to the microstrip lines 17A and 17B is in an open state at the used frequency.

On the other hand, the two terminals 20 of the LED 19 are
A and 20B are respectively connected to the tip ends of the two conductor wires 11A and 11B. That is, in the second embodiment, two linear conductor wires 11A which are antenna elements,
11B is also used as the wiring of the LED 19,
The LED 19 includes two linear conductor wires 11A and 11B and a short-circuited 1/4 wavelength microstrip line 17A.
It has a structure connected to the control circuit block via 17B.

In the antenna device of the second embodiment configured as described above, the conductor wire 11 which is the antenna element 10 is used.
Since A and 11B are also used as the wiring connecting the LED 19 and the control circuit block, a high frequency signal toward the control circuit block side is induced, but the high frequency signal is a quarter wavelength microstrip line 17A, Completely removed by 17B. Therefore, without impairing the performance of the monopole antenna, without affecting the call quality,
A highly flexible antenna device including the LED 19 can be realized.

When the number of terminals of the LED 19 is 3 or more, a conductor wire as an antenna element, a strip line,
Even if the required number of signal systems including the high frequency bypass capacitors is increased, the same effect as described above can be obtained.

In order to avoid a short circuit between the conductor wires forming the antenna element, an insulator may be provided on the outer peripheral portion of each conductor wire or between the conductor wires. Further, the conductor wire forming the antenna element may be formed on the insulating substrate.

The quarter-wave microstrip line does not have to have a linear structure, but may have a spiral structure or another structure.

[Third Embodiment] FIG. 3 shows a third embodiment of the antenna apparatus of the present invention. This antenna device uses two spiral conductor wires 28A and 28B as antenna elements instead of the two linear conductor wires 11A and 11B in the antenna device of the second embodiment. Two spiral conductor wires 28A, 2
An LED 21 as a light emitting element is connected to the tip of 8B.

That is, the two conductor wires 28A and 28B
Are arranged in a spiral shape in parallel with each other so that they do not come into contact with each other, and their lower ends are the power supply wirings 2.
It is connected to the high frequency power supply unit 22 via 9A and 29B. The high frequency power supply section 22 is connected to the high frequency circuit block via a power supply wiring 23. The power supply wiring 29A, 2
Between the 9B, the two conductor wires 28 constituting the antenna
A high-frequency bypass capacitor 24 is arranged according to the coupling capacitance between A and 28B, and both conductor lines 28A and 28B are arranged.
Are excited in the same phase and operated as if they were one helical antenna.

Further, the above-mentioned two spiral conductor wires 28A,
28B is 1 via the power supply wirings 29A and 29B, respectively.
/ 4 wavelength microstrip lines 26A and 26B are connected to one end of each of the microstrip lines 26A and 26B.
The other ends of the
It is connected to the high frequency ground via A and 27B.
From the high frequency power supply section 22 to the microstrip line 26A,
The 26B side is in an open state at the used frequency.

On the other hand, the two terminals 25 of the LED 21 are
A and 25B are respectively connected to the tip portions of the two conductor wires 28A and 28B. That is, in the third embodiment, the two spiral conductor wires 28 as antenna elements are used.
A and 28B are used as the wiring of the LED 21 provided at the tip thereof, and two spiral conductor wires 28A and 2A are used.
8B and the short-circuited type 1/4 wavelength microstrip lines 26A and 26B are connected to the control circuit block.

In the antenna device of the third embodiment configured as described above, the conductor wires 28A and 2 which are antenna elements are used.
Since 8B is also used as a wiring connecting the LED 21 and the control circuit block, a high frequency signal toward the control circuit block side is induced, but the signal is completely transmitted by the ¼ wavelength microstrip lines 26A and 26B. Will be removed. Therefore, it is possible to realize a flexible and shortened antenna device including the LED 21 without impairing the performance of the helical antenna and without affecting the call quality.

In the third embodiment as well, L
When the number of terminals of the ED 21 is 3 or more, the same effect as described above can be obtained even if the required number of signal systems including conductor lines, strip lines, and high frequency bypass capacitors as antenna elements is increased.

In order to avoid a short circuit between the conductor wires forming the antenna element, an insulator may be provided on the outer peripheral portion of each conductor wire or between the conductor wires. Also, the same effect can be obtained by forming the conductor wire forming the antenna element on the insulating substrate in a zigzag shape.

Further, the quarter-wave microstrip line does not have to have a linear structure, and may have a spiral structure or another structure.

In the above embodiments, the case where the LED is used as the light emitting element provided in the antenna has been described as an example, but other light emitting elements such as LD and EL elements may be used.

The position of the light emitting element is not limited to the tip portion of the antenna, but may be provided in the middle portion, or a plurality of light emitting elements may be provided.

[0045]

As described above, the present invention exhibits the following excellent effects.

(1) According to the first aspect of the invention, the wiring connecting the light emitting element provided in the antenna and the circuit in the communication device is provided so as to avoid the slot portion formed in the antenna element, and the outer surface of the antenna element. Since it is provided along with, the high frequency signal is not induced in the wiring that connects the light emitting element and the circuit in the communication device. Therefore, it is possible to realize the antenna device in which the light emitting element is provided in the antenna element without affecting the antenna performance and the call quality.

(2) According to the second aspect of the invention, the wiring connecting the light emitting element provided in the antenna and the circuit in the communication device is arranged at a position behind the antenna element with respect to the slot. Induction of high frequency current in the wiring can be prevented more reliably than in the case of the item (1).

(3) According to the third aspect of the invention, since the antenna is also used as the wiring connecting the light emitting element provided in the antenna and the circuit in the communication device, a high frequency signal directed to the circuit in the communication device is induced. However, the high-frequency signal is completely removed by the quarter-wave microstrip line with one end short-circuited. Therefore, it is possible to realize the antenna device in which the antenna is provided with the light emitting element without affecting the antenna performance and the call quality.

(4) According to the invention as set forth in claim 4, the antenna element is a light emitting element without impairing the performance of the antenna in which a plurality of linear antenna elements are arranged in parallel with each other with a minute gap therebetween. It is also possible to realize an antenna device provided with a light emitting element by also being used as the wiring.

(5) According to the fifth aspect of the invention, the antenna element is a light emitting element without deteriorating the performance of the antenna in which a plurality of spiral antenna elements are arranged in parallel with each other with a minute gap therebetween. It is also possible to realize an antenna device provided with a light emitting element by also being used as the wiring.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of an antenna device of the present invention, (a) is a front view, (b) is a partial side view, and (c) is a partial plan view.

FIG. 2 is a schematic front view showing a second embodiment of the antenna device of the present invention.

FIG. 3 is a schematic front view showing a third embodiment of the antenna device of the present invention.

FIG. 4 is a schematic view showing a conventional antenna device,
(A) is a front view, (b) is a partial plan view.

FIG. 5 is a schematic view showing a conventional antenna device,
(A) is a front view, (b) is a partial plan view.

[Explanation of symbols]

 1 Case of Mobile Communication Device 2 Antenna Element 3 LED (Light Emitting Element) 4 Slot 5 High Frequency Power Supply Section 6 Power Supply Line 7 Wiring 11A, 11B Conductor (Antenna Element) 12 Case of Mobile Communication Device 13A, 13B Power Supply Wiring 14 High Frequency Power supply unit 15 Power supply wiring 16 High frequency bypass capacitors 17A, 17B 1/4 wavelength microstrip line 18A, 18B High frequency bypass capacitor 19 LED 20A, 20B terminal 21 LED (light emitting element) 22 High frequency power supply unit 23 Power supply wiring 24 High frequency bypass Capacitors 25A, 25B Terminals 26A, 26B Quarter-wave microstrip lines 27A, 27B High frequency bypass capacitors 28A, 28B Conductor wires (antenna elements) 29A, 29B Power supply wiring 30 Antenna element 31 High frequency power supply section 32 Wiring 33 LED 34 Wiring 35 Choke coil 38 Control circuit block

Claims (5)

[Claims] 1. An antenna device comprising a light emitting element provided on an antenna projecting to the outside of a communication device, wherein a slot antenna formed by forming a slot at an intermediate portion of an antenna element having a hollow structure is used as the antenna. An antenna device, characterized in that wiring for connecting to a circuit in the communication device is provided along the outer surface of the antenna element so as to avoid the slot portion. 2. The antenna device according to claim 1, wherein the wiring is provided along an outer surface of the antenna element opposite to a side where the slot is formed. 3. An antenna device comprising a light emitting element provided on an antenna projecting outside a communication device, wherein the antenna also serves as a wiring connecting the light emitting element and a circuit in the communication device, and the antenna and the circuit. An antenna device characterized in that a quarter-wave microstrip line with one end short-circuited is provided between the antenna and the antenna to remove a high-frequency signal from the antenna to the circuit. 4. The antenna device according to claim 3, wherein the antenna is composed of a plurality of linear antenna elements arranged in parallel with each other with a small distance therebetween. 5. The antenna apparatus according to claim 3, wherein the antenna is composed of a plurality of spiral antenna elements arranged in parallel with each other with a small gap therebetween.