JPH0648247U - Wireless device with integrated antenna - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Even if an accessory such as a headphone is connected to the housing, good communication is possible without affecting the antenna gain or the directivity of radio waves. [Structure] Antenna 2 provided integrally with the housing
And an accessory connection terminal 1, the accessory connection terminal 21 is formed at the tip of the antenna, and the accessory terminal is connected to an electronic circuit inside the housing via the antenna. Integrated wireless device.

Description

[Detailed description of the device] [Industrial applications]

 The present invention relates to a wireless device with an integrated antenna.

[Prior art]

 Conventionally, in communication devices such as mobile phones, cordless phones, and specified low-power transceivers, the Radio Law and the Japan Radio Wave Development Center (RCR) have been used to prevent public radio waves from interfering with each other or to maintain compatibility between these devices. Standardization of planning is being carried out by public organizations such as. For example, in a 400 MHz band specific low power transceiver, “For an antenna, the antenna gain of the transmitter is an absolute gain of 2.14 dB or less, and the radio equipment is housed in one casing and does not have an antenna terminal. It cannot be opened easily. ” In a vertical antenna such as a mobile phone or a cordless phone, the antenna is equivalent to the case where the housing is connected by a ground capacitor, so the antenna is half the length of a 1 / 2λ dipole, that is, 1 / 4λ. . A vertical antenna with a length of ¼ λ or more will have a dipole gain of ½ λ or more and an absolute gain of 2.14 dB or more depending on the matching, and the Radio Law is not satisfied. Therefore, in these wireless devices, the housing and the antenna are integrated, the length of the antenna is 1 / 4λ or less, and the antenna cannot be easily removed.

[Problems to be Solved by the Invention]

 In recent years, many external accessories have been prepared for such wireless devices in order to improve usability. Most of these accessories are used by connecting to the housing of wireless equipment, and examples of these accessories include headphones, microphones, press talk switches, remote controllers, and intercoms that combine them. Unlike a loop antenna, a vertical antenna integrated in a wireless device is more effective in detecting or emitting an electric field than a magnetic field. In addition, the current distribution often exists at the feeding point. Therefore, in these wireless devices, when such an accessory is attached to the housing of the wireless device, the directivity of the radio wave is increased or the antenna gain is significantly reduced, which adversely affects the flight of the radio wave and is important. Communication was hindered.

[Means for Solving Problems]

 An antenna integrated with the housing and an accessory terminal are provided, and the accessory connection terminal is formed at the tip of the antenna so that the accessory terminal can be electrically connected to the electronic circuit inside the housing through the antenna. did.

[Action]

 At the tip of the vertical antenna, the current distribution of the radio wave is considerably reduced compared to the feeding point. Therefore, even if the accessory is connected to the accessory connection terminal provided at the tip of the antenna, the directivity of the radio wave and the antenna gain will not be affected.

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a wireless device with a built-in antenna according to the present invention, and a specific low power transceiver of 400 MHz band will be described below as an example. Reference numeral 1 is an accessory connection terminal, 2 is an antenna, 3 is a housing, 4 is a press talk switch, 5 is a speaker, and 6 is a microphone. In this case, the accessory connection terminal is a headphone jack. By connecting a headphone to this terminal, the sound of the speaker is cut off and it becomes possible to listen to the sound from the headphone. The press talk switch 4 is a switch for switching from reception to transmission and transmitting. Press this switch to switch to transmission. FIG. 2 is a perspective view showing an example of use of the antenna-integrated wireless device of the present invention, to which headphones as an accessory of the transceiver are connected. Reference numeral 21 is a headphone plug, 22 is a headphone cord, and 23 is a headphone. FIG. 3 is a simplified block diagram showing an example of a wireless device with an integrated antenna according to the present invention. 30 is a transceiver, 31 is a low frequency amplifier, and 32 is an antenna terminal. The connection between the connection terminal 1 provided at the tip of the antenna 2 and the low-frequency amplifier 31 and the speaker 5 exists inside the antenna in the embodiment. FIG. 4 is a cross-sectional view of an antenna as an example of the antenna-integrated wireless device of the present invention, showing a three-core shielded wire structure in the embodiment. Reference numeral 11 is an inner core conductor, 12 is an inner core insulator, 13 is a shield material, and 14 is an insulator. Copper or the like is used as the material of the conductor 11 and the shield material 13. Further, vinyl chloride or the like is used as the material of the insulators 12 and 14. FIG. 5 is a perspective view showing an example of an antenna-integrated wireless device of the present invention in which an accessory connection terminal is integrally formed with an antenna, wherein 41 is a connection terminal and 42 is an antenna.

[Effect of device]

 Even if an accessory is connected to the accessory connection terminal provided at the tip of the antenna, the directivity of the radio wave will increase or the antenna gain will decrease significantly, adversely affecting the flight of the radio wave or interfering with important communications. It is to obtain a wireless device that is easy to use while efficiently communicating without causing any trouble. Also, since the accessory connection terminal is located at the tip of the protrusion called the antenna, the accessory and antenna do not get entangled when the accessory is connected.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an antenna integrated wireless device of the present invention.

FIG. 2 is a perspective view showing an example of use of the antenna-integrated wireless device of the present invention.

FIG. 3 is a simplified block diagram showing an example of a wireless device with an integrated antenna according to the present invention.

FIG. 4 is a cross-sectional view of an antenna of an example of a wireless device with an integrated antenna according to the present invention.

FIG. 5 is a perspective view showing an example of an antenna-integrated wireless device of the present invention in which an accessory connection terminal is formed integrally with an antenna.

FIG. 6 is a perspective view showing an example of a conventional wireless device with an integrated antenna.

FIG. 7 is a perspective view showing a usage example of a conventional wireless device with an integrated antenna.

[Explanation of symbols]

 1 Accessory Connection Terminal 2 Antenna 3 Housing 4 Press Talk Switch 5 Speaker 6 Microphone 11 Inner Core Conductor 12 Inner Core Insulator 13 Shielding Material 14 Insulator 21 Headphone Plug 22 Headphone Cord 23 Headphone 30 Transceiver 31 Low Frequency Amplifier 32 Antenna terminal 41 Connection terminal 42 Antenna

Claims (1)

[Scope of utility model registration request] 1. An antenna integrally provided to a housing, and an accessory connection terminal, wherein the accessory connection terminal is formed at a tip of the antenna, and the accessory terminal is provided through the antenna to the housing. An antenna-integrated wireless device, which is connected to an internal electronic circuit.