JPH10224698A - Antenna circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna circuit by which the operating convenience is improved without giving an effect on reception sensitivity and an external appearance with respect to a miniaturized device is not deteriorated by configuring the antenna circuit without the use of a comparatively long rod antenna. SOLUTION: Relating to the reception capability of a dielectric antenna section 13, the receptible frequency band is made extremely narrower in comparison with that of a conventional rod antenna. Thus, since it is required to allow the antenna circuit to be tuned to each broadcast channel, a varactor diode 14 is provided in series with the dielectric antenna section 13 and a voltage generating circuit 17 applies a voltage suitable for each antenna to the varactor diode 14 to allow the diode 14 to receive a radio wave through tuning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna circuit capable of receiving a television signal.

[0002]

2. Description of the Related Art In recent years, with the development of television signal output devices typified by liquid crystal devices and the progress of miniaturization of electronic circuits, television receivers, video cameras and their peripherals which can be used outdoors have been represented. Combined products of television signal receivers are thriving in the market. Among them, a rod antenna is generally used as an antenna for receiving a television signal with a size suitable for miniaturization of equipment.

Hereinafter, a conventional antenna circuit will be described with reference to the drawings. FIG. 3 is a block diagram showing a configuration of a conventional antenna circuit. In FIG. 3, reference numeral 31 denotes a rod antenna for receiving a broadcast wave of a television signal;
Is a tuner unit for receiving a television signal of a desired channel in the television signal received by the rod antenna 31.

The operation of the conventional antenna circuit configured as described above will be described below.

[0005] A television signal received by the rod antenna 31 is input to a tuner section 32, from which a television signal of a desired channel is received. Here, the setting of the receiving sensitivity of the antenna circuit is determined by the length and directionality of the rod antenna 31, so that the rod antenna 31 is configured to be extensible and rotatable. In general, the length is set to about 70 cm, and the range of the rotation angle is set to be about hemispherical from the center of rotation.

[0006]

However, in the above-described conventional configuration, the length and angle of the rod antenna corresponding to the receiving channel must be adjusted as necessary. In a narrow place such as in a car, these adjustment ranges are also limited. However, there is a problem that the receiving sensitivity is reduced and the usability is deteriorated. Further, since the rod antenna becomes longer for a miniaturized device, the appearance of the entire device is deteriorated.

The present invention solves the above-mentioned conventional problems. By forming an antenna circuit without using a relatively long rod antenna, the reception sensitivity is not affected and the usability is improved and the size is reduced. An object of the present invention is to provide an antenna circuit that does not degrade the appearance of a device.

[0008]

In order to solve the above-mentioned problems, an antenna circuit according to the present invention comprises: a dielectric antenna unit capable of receiving a television signal; And a voltage generating circuit for generating a voltage corresponding to a receiving channel in the variable capacitance diode.

Also, a dielectric antenna unit capable of receiving a television signal, a variable capacitance diode for tuning the dielectric antenna unit to the frequency of each channel of the television signal, and a variable capacitance diode corresponding to a receiving channel. A voltage generating circuit for generating a voltage; and an auxiliary antenna connected to the dielectric antenna unit and capable of receiving a television signal.

[0010] With this configuration, the antenna circuit is configured without using a relatively long rod antenna, thereby improving the usability without affecting the receiving sensitivity and improving the aesthetic appearance of a miniaturized device. Is obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a dielectric antenna capable of receiving a television signal, and a variable antenna for tuning the dielectric antenna to the frequency of each channel of the television signal. A capacitance diode; and a voltage generation circuit that generates a voltage corresponding to a reception channel in the variable capacitance diode. With this configuration, the usability is improved without affecting the reception sensitivity and the size of the downsized device is improved. Is not reduced.

According to a second aspect of the present invention, there is provided a dielectric antenna unit capable of receiving a television signal, a variable capacitance diode for tuning the dielectric antenna unit to the frequency of each channel of the television signal, and the variable capacitance diode. A diode is provided with a voltage generating circuit for generating a voltage corresponding to a reception channel, and an auxiliary antenna connected to the dielectric antenna unit and capable of receiving a television signal. An antenna circuit that does not degrade the aesthetic appearance of a device that has been manufactured can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram showing the configuration of an embodiment of an antenna circuit according to the present invention. In FIG. 1, 1
Reference numeral 3 denotes a small dielectric antenna unit for receiving a broadcast wave of a television signal, 12 denotes a tuner unit for receiving a television signal of a desired channel in the television signal received by the dielectric antenna unit 13, and 14 denotes a dielectric material. Antenna unit 1
A variable capacitance diode for tuning the television signal received at 3 to a desired channel, 15 is a digital / analog converter (hereinafter referred to as D / A converter), and 16 is a central processing unit (hereinafter referred to as CPU). , 17 are voltage generating circuits each comprising a D / A converter 15 and a CPU 16, generating a voltage suitable for the receiving channel and supplying the voltage to the variable capacitance diode 14.

The operation of the antenna circuit of the present embodiment configured as described above will be described below.

The television signal received by the dielectric antenna section 13 is such that the tuner section 12 receives a television signal of a desired channel. here,
The television signal is received by the dielectric antenna unit 13, and the reception capability of the dielectric antenna unit 13 is extremely narrow in a receivable frequency band as compared with a general rod antenna. Therefore, since it is necessary to tune each broadcast channel in the antenna circuit, a variable capacitance diode 14 is provided in series with the dielectric antenna unit 13,
Further, the voltage generating circuit 17 supplies a voltage suitable for each channel to the variable capacitance diode 14 so as to perform tuning reception.

As described above, according to the present embodiment, by using the small dielectric antenna section 13 instead of the rod antenna, the miniaturization of the device is not affected and the appearance is not deteriorated. Further, the reception sensitivity can be ensured by the variable capacitance diode 14 and the voltage generation circuit 17.

(Embodiment 2) Hereinafter, a second embodiment of the antenna circuit of the present invention will be described. FIG. 2 is a block diagram of the antenna circuit according to the present embodiment. In FIG. 2, reference numeral 23 denotes a small dielectric antenna unit that receives a broadcast wave of a television signal, 22 denotes a tuner unit that receives a television signal of a desired channel in the television signal received by the dielectric antenna unit 23, 24 is a variable capacitance diode for tuning a television signal received by the dielectric antenna unit 23 to a desired channel, 25 is a D / A converter, 26 is a CPU, 27 is a D / A converter 25 and a CPU.
26, a voltage generation circuit for generating a voltage suitable for the reception channel and supplying the voltage to the variable capacitance diode 24;
Is an auxiliary antenna connected in series to the dielectric antenna section 23, which is an antenna shorter than a normal rod antenna, and may be configured by a pattern on a printed circuit board (pattern antenna).

The operation of the antenna circuit of the present embodiment configured as described above will be described below.

The television signal received by the dielectric antenna section 23 and the auxiliary antenna 21 is transmitted to the tuner section 22.
Receives a television signal of a desired channel. Here, the television signal is received by the dielectric antenna unit 23, and the reception capability of the dielectric antenna unit 23 is extremely narrow in a receivable frequency band as compared with a general rod antenna. Therefore,
Since it is necessary to tune each broadcast channel in the antenna circuit, a variable capacitance diode 24 is provided in series with the dielectric antenna unit 23, and a voltage generating circuit 27 applies a voltage suitable for each channel to the variable capacitance diode 24. By supplying the signal, tuning reception is performed.

The reason why the auxiliary antenna 21 is provided as described above is that, in order to further improve the receiving sensitivity (especially in the VHF band) in the configuration of the first embodiment, it is necessary to enlarge the dielectric antenna portion. This is because it leads to a significant cost increase.

As described above, according to the present embodiment, in addition to the configuration of the first embodiment, the provision of the auxiliary antenna 21 further improves the receiving sensitivity, does not affect the miniaturization of the device, and Aesthetics are not reduced.

[0022]

As described above, according to the present invention, it is possible to obtain an excellent effect that an antenna circuit which can secure the receiving sensitivity and does not affect the downsizing of the device and does not deteriorate the aesthetic appearance can be obtained. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an antenna circuit according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of an antenna circuit according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional antenna circuit.

[Explanation of symbols]

 Reference Signs List 12 Tuner 13 Dielectric antenna section 14 Variable capacitance diode 17 Voltage generation circuit 21 Auxiliary antenna 22 Tuner 23 Dielectric antenna section 24 Variable capacitance diode 27 Voltage generation circuit

Claims (3)

[Claims] 1. A dielectric antenna capable of receiving a television signal, a variable capacitance diode for tuning the dielectric antenna to a frequency of each channel of the television signal, and a variable capacitance diode corresponding to a receiving channel. An antenna circuit, comprising: a voltage generation circuit that generates a voltage. 2. A dielectric antenna unit capable of receiving a television signal, a variable capacitance diode for tuning the dielectric antenna unit to a frequency of each channel of the television signal, and a variable capacitance diode corresponding to a receiving channel. An antenna circuit comprising: a voltage generation circuit for generating a voltage; and an auxiliary antenna connected to the dielectric antenna unit and capable of receiving a television signal. 3. The antenna circuit according to claim 1, wherein the voltage generation circuit includes a digital / analog converter and a central processing unit.