JP2002016412A - Incorporated antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a polarization loss and to eliminate the influence of the radiation pattern of a main body side antenna caused by opening/closing a lid. SOLUTION: This incorporated antenna is composed of a first antenna connected with a transmitting/receiving circuit provided on the side of a main body of radio equipment and a second antenna provided on the side of the lid, which is installed while facing the main body, to be opened at the time of speaking and to be closed at the time of standby, and the second antenna is provided along with an end side most separated from the side of the main body in the case of opening the lid, connected with the transmitting/receiving circuit, which is connected by a feeder, at the time of speaking and disconnected at the time of standby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna mounted on a portable radio, a cordless telephone or the like and having a high gain without changing a radiation pattern between a call and a standby.

[0002]

2. Description of the Related Art Conventionally, as a portable radio antenna, a whip antenna which is used by extending it from a radio unit by hand or the like, and a built-in inverted F antenna having a large size but a fixed size are used. . These antennas have sufficient gain during standby, but when talking, the radio is held and operated, so there is a possibility that the head or the human body will affect the antenna gain and reduce the antenna gain.

[0003] As an improved structure, Japanese Patent Laid-Open Publication No.
Utilizing the fact that an antenna is provided on a lid of a wireless device and that an effective dielectric constant of the antenna changes between when the flip is opened and when the flip is closed, a tuning frequency is set between a call and a standby time as disclosed in JP-A-86518. Is changed. FIG. 8 is a diagram showing a conceptual configuration of this antenna. In FIG. 8, reference numeral 3 denotes a flip, and reference numerals 13 and 14 denote antennas, which constitute two antennas whose effective lengths are compressed in the longitudinal direction of the lid. This configuration does not consider polarization loss. As another conventional example, according to Japanese Patent Application Laid-Open No. 6-216621, an antenna is provided on a main body and a lid, and when the lid is closed, both are connected to operate as an inverted F antenna. Is shown that operates as a dipole antenna by cutting off the electrical connection of. This also does not consider the polarization loss.

[0004]

The conventional antenna with a built-in flip is constructed as described above. When the lid is closed, the antenna on the flip side approaches the ground of the radio, and the radiation resistance of the antenna decreases. And the efficiency becomes worse, and FIG.
In the above configuration, the wireless device is used at the time of tilting during a call, so that it is not compatible with the vertical polarization from the base station. For example, when tilted by 30 degrees, a loss of about 3 dB occurs at 10 log (sin30). . Further, there is another problem that the radiation pattern of the antenna installed on the main body side is affected by opening and closing of the lid.

The antenna according to the present invention has been made to solve the above-mentioned problem. The antenna on the flip side is cut off during standby when the lid is closed, and the antenna operation is stopped. An object of the present invention is to reduce the polarization loss by combining antennas, and to eliminate the influence of the radiation pattern of the main body antenna due to opening and closing of the lid.

[0006]

A built-in antenna according to the present invention comprises a first antenna connected to a transmission / reception circuit provided on a radio main unit side, and a lid side opposed to a main unit which is opened during a call and closed during standby. The second antenna is provided along the farthest end from the main body side when the lid is opened, in the short side direction on the lid side,
In addition, the transmission / reception circuit connected by the power supply line is connected during a call and cut off during standby.

Further, the second antenna is installed at an angle of 45 to 30 degrees with respect to the farthest end.

Further, the second antenna is rotatably supported by a fulcrum on the lid, and a weight is provided at the tip of the second antenna.

Further, the second antenna has an antenna structure in which the actual length is compressed.

Further, a feed line for connecting the second antenna and the transmission / reception circuit is provided, and the electrical length of the feed line is set to an integral multiple of 1/2 of the transmission / reception wavelength.

Further, a feed line for connecting the second antenna and the transmitting / receiving circuit is provided, and a high-frequency cutoff substance is provided in the middle of the feed line.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 The built-in antenna according to the present embodiment, which focuses on improving the antenna gain during a call, will be described. FIG. 1 is a diagram showing the configuration, in which 1 is a wireless device, 2 is an antenna provided on the wireless device main body, 3 is a lid that opens during a call and closes during standby, a flip, and 4 is a power supply provided on the flip. The electric wire 6 is a built-in antenna provided on the characteristic flip of the present invention. Reference numeral 5 denotes a power supply unit that connects the built-in antenna 6 and the power supply line 4.

The flip-side built-in antenna 6 according to the present invention is connected to a transmitting / receiving circuit and operates when the flip is opened as a dipole antenna. Although there are various connection methods, the connection method is not described here. on the other hand,
The antenna 2 built in the main body is typically a whip antenna. According to the arrangement of the flip built-in antenna 6, the loss due to polarization mismatch is, for example, 10 log (s).
in60) = 0.6 dB. This value is sufficiently smaller than the 3 dB loss of the conventional built-in antenna, as described above, and a high gain can be obtained during a call with the flip opened.

Another configuration in the present embodiment will be described. In FIG. 1, the flip built-in antenna is installed in parallel with the short side, but as shown in FIG. Or installed at an angle of 45 degrees. In this way, the speaker is naturally moved vertically by about 6 when talking.
Since the antenna is held at an angle of 0 to 45 degrees, the built-in antenna is substantially in a vertical position, and the polarization loss is reduced.

In FIG. 2, a weight 7 may be provided at one end of the rod-shaped built-in antenna 6, and a hole penetrating the flip 3 may be provided at or near the other end, and a structure may be provided so as to be rotatable around the hole. . Since the pendulum structure using the weight 7 is used in this manner, the built-in antenna 6 can always be maintained at the vertical position regardless of the preset inclination.

FIG. 3 is a diagram showing the configuration of still another built-in antenna according to the present embodiment. That is, the built-in antenna is 9
Meander antenna element having a bent structure. FIG. 4 is a view showing another built-in antenna. The built-in antenna has ten helical antenna elements. These are rigid elements which, when stored, take the form of a rod or a plate of bar. FIG. 5 is a diagram showing another antenna structure, wherein the antenna is eleven chip antenna elements. These elements are small in size and have substantially the same effect as increasing the antenna length.

Embodiment 2 FIG. In the above embodiment, the structure of the built-in antenna itself having a small polarization loss focused on during a call has been described. Here, other measures for increasing the antenna gain will be described. That is, the configuration of the flip built-in antenna 6 is such that the radiation pattern of the antenna 2 built in the main body is not affected. FIG. 6 is a diagram showing the structure of the flip built-in antenna according to the present embodiment. In the figure, the length of the feed line 4b to the built-in antenna 6 is set to 1/2 of the transmission / reception wavelength or an integral multiple thereof. That is, the power supply line 4b
Is set to half of the predetermined wavelength or an integral multiple thereof, so that even when the flip 3 is opened,
Radiation pattern is not affected. That is, the polarization diversity effect of the main body side antenna 2 and the flip built-in antenna 6 having different main polarizations can be enhanced.

FIG. 7 is a diagram showing another configuration in the present embodiment. In the figure, reference numeral 12 denotes a ferrite provided on the feeder line 4, which utilizes the property of blocking high frequencies. By doing so, the radiation pattern distortion of the antenna 2 on the main body side can be prevented. That is, the polarization diversity effect of the combination can be enhanced.

[0019]

As described above, according to the present invention, the built-in antenna is configured to eliminate the polarization loss during a call and to have a high gain, and when the cover is closed, the antenna function on the cover side is stopped to stop the main body. Since the configuration does not affect the radiation pattern on the side, a high gain can be obtained mainly during a call.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a built-in antenna according to Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a configuration of another built-in antenna according to the first embodiment.

FIG. 3 is a diagram showing a configuration of another built-in antenna according to the first embodiment.

FIG. 4 is a diagram showing a configuration of another built-in antenna according to the first embodiment.

FIG. 5 is a diagram showing a configuration of another built-in antenna according to the first embodiment.

FIG. 6 is a diagram showing a configuration of a built-in antenna according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of another built-in antenna according to the second embodiment.

FIG. 8 is a diagram showing a configuration of a conventional built-in antenna.

[Explanation of symbols]

1 Radio, 2 Radio body side antenna, 3 flip, 4,4b feeder, 5 feed, 6 flip built-in antenna, 7 weight, 9 meander antenna element, 1
0 Helical antenna element, 11 chip antenna element, 12 ferrite.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H04B 7/26 H04B 7/26 B F term (reference) 5J021 AA02 AA13 AB02 AB03 CA01 CA06 HA05 HA06 5J046 AA04 AB06 AB07 AB10 AB12 PA01 5J047 AA04 AB06 AB07 AB10 AB12 FD01 5K067 AA02 AA33 BB04 BB08 EE04 KK03 KK17

Claims (6)

[Claims] 1. A first antenna connected to a transmission / reception circuit provided on a radio device main body side, and a second antenna provided on a lid side opposed to the main body which is opened during a call and closed during standby. The second antenna is provided in the short side direction on the lid side along the farthest end from the main body side when the lid is opened, and communicates with a transmission / reception circuit connected by the power supply line. A built-in antenna that is sometimes connected and cut off during standby. 2. The second antenna has a distance of 4
The built-in antenna according to claim 1, wherein the antenna is installed at an angle of 5 to 30 degrees. 3. The built-in antenna according to claim 1, wherein the second antenna is rotatably supported at a fulcrum by a lid, and a weight is provided at a tip of the second antenna. 4. The built-in antenna according to claim 2, wherein the second antenna has an antenna structure whose actual length is compressed. 5. A power supply line for connecting a second antenna and a transmission / reception circuit is provided, and an electrical length of the power supply line is set to の of a transmission / reception wavelength.
2. The built-in antenna according to claim 1, wherein the integral antenna is an integral multiple of the following. 6. The built-in antenna according to claim 1, wherein a feed line connecting the second antenna and the transmission / reception circuit is provided, and a high-frequency blocking substance is provided in the middle of the feed line.