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Antenna equipment

An antenna device and antenna unit technology, which is applied in the directions of antennas, resonant antennas, components of resonant antennas, etc., can solve the problems of increasing distance and difficulty in achieving antenna gain, and achieve the effect of high antenna gain.

Inactive Publication Date: 2008-01-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gain and frequency characteristics of the gain characteristic curve 6 are relatively uniform in a wide frequency range, however, as the frequency increases, the distance 7 between the characteristic curve 6 and the reference value 5a becomes larger
Therefore, it is difficult for this antenna device to achieve sufficient antenna gain in a wide frequency range

Method used

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  • Antenna equipment
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] FIG. 1 is a circuit diagram of an antenna device according to Embodiment 1. As shown in FIG. In FIG. 1 , a cathode 12 a of a varactor diode (variable capacitor) 12 whose capacitance varies with an applied voltage is connected to one end of a tuning type monopole antenna element 11 . The anode 12b of the varactor diode 12 is grounded through the choke inductor 13 used to prevent the RF signal from passing through the DC. The tuning power supply terminal 14 is connected to the cathode 12a of the varactor diode 12 through a choke inductor 15 for supplying direct current. The signal power terminal 16 is connected to the anode 12b of the varactor diode 12 through a coupling capacitor 17 for blocking the direct current flow of the radio frequency signal. A varactor can be used as the varactor 12 .

[0026] The combination of the inductance component of the monopole antenna unit 11 and the capacitance of the varactor diode 12 forms a series resonant circuit. Therefore, the ...

Embodiment 2

[0032] The antenna device according to Embodiment 2 includes a parallel resonant circuit including an inductor 20 with a center tap and a varactor diode 12 connected in parallel. In FIG. 3 , one end of the monopole antenna element 11 is connected to the center tap 20c of the inductor 20 . One end 20a of the inductor 20 is connected to the signal power terminal 16 through a coupling capacitor 17 for blocking DC by passing a radio frequency (RF) signal. The other end 20b of the inductor 20 is grounded. The tuning capacitor 21 is connected in series with the varactor diode 12 and also connected in parallel with the inductor 20 to form a parallel resonant circuit.

[0033] The junction of the tuning capacitor 21 and the varactor diode 12 (the cathode 12a of the varactor diode 12 ) is connected to the tuning power supply terminal 14 through the choke inductance 15 used to prevent the RF signal from passing through DC. Tuning capacitor 21 is also used to block DC.

[0034] In Emb...

Embodiment 3

[0036] An antenna device according to Embodiment 3 includes a parallel resonance circuit having mutual inductance. In FIG. 4 , inductor 22 is coupled with tuning inductor 23 through mutual inductance. One end of the inductor 22 is connected to one end of the monopole antenna element, and the other end of the inductor is grounded.

[0037] After the tuning capacitor 21 is connected in series with the varactor diode 12, it is connected in parallel with the inductor 23 to form a parallel resonant circuit.

[0038] In this example, the impedance of the inductor 22 is easily matched to the impedance of the monopole antenna element 11 .

[0039] Although not shown in the figure, the antenna device may comprise a separate inductor 24 coupled to the tuning inductor 23 by mutual inductance. One end of the inductor 24 may be connected to the signal power terminal 16 while the other end is connected to ground. After the tuning capacitor 21 is connected in series with the varactor diod...

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PUM

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Abstract

An antenna device having a high gain is presented. The device includes an antenna element, a variable capacitor disposed closely to the antenna element and connected to the antenna element in series or parallel to form a resonance circuit, a tuning voltage supply terminal for supplying a tuning voltage for varying a capacitance of the variable capacitor, and an signal power terminal capable of at least one of sending a signal power to the resonance circuit and receiving a signal power from the resonance circuit.

Description

technical field [0001] The invention relates to a variable frequency antenna device capable of changing its operating frequency. Background technique [0002] The operating frequency of the monopole antenna device usually depends on the entire length of the antenna rod, which has an extended structure and is widely used in small wireless devices. Figure 17 shows a conventional monopole antenna arrangement. The monopole antenna unit 1 is connected to a signal power terminal 3 through a coupling capacitor 2 . When the antenna device is used as a receiving antenna, radio waves received by the signal power terminal 3 are sent to a radio frequency (RF) receiver such as a tuner. When the antenna device is used as a transmitting antenna, the transmitting signal from the radio frequency transmitter is sent to the antenna unit through the signal power terminal 3, and is transmitted to free space in the form of radio waves. Fig. 18 is a gain versus frequency characteristic curve of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q23/00H04B1/04H04B1/16H01Q13/08H01Q1/38H01Q5/10H01Q5/335H01Q5/364H01Q9/14H01Q9/30H04B1/18
CPCH01Q5/0041H01Q9/30H01Q23/00H01Q5/335
Inventor 北村浩一安田雅克大西和夫中岛吉启
Owner PANASONIC CORP