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A tuning method for tuning an antenna

A technology for tuning antennas and antennas, applied in the field of tuning antennas, can solve problems such as affecting bandwidth accuracy, and achieve the effect of improving anti-interference ability

Active Publication Date: 2017-10-20
INST OF ELECTRONICS & INFORMATION ENG OF UESTC IN GUANGDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Antennas are susceptible to environmental influences such as metals and magnetic materials, causing their resonant frequency to change. At present, capacitor tuning is commonly used to restore the resonant frequency, but at this time the quality factor of the circuit has also changed. According to the quality factor, resonant frequency and bandwidth The constraint relationship, the change of the quality factor will affect the accuracy of the bandwidth

Method used

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  • A tuning method for tuning an antenna
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Examples

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specific Embodiment

[0053] The multisim software is used to carry out the example simulation of the present invention. The frequency of the power supply is 13.56MHZ, and the amplitude is a sine wave of 1V. Add a circuit table to the corresponding branch of the circuit to facilitate direct reading of the current value of the branch.

[0054] Such as Figure 4 As shown, the antenna coil 1 is in a resonant state not affected by the external environment, that is, the best working state, the equivalent inductance 101 is 1.8μH, the equivalent resistance 102 is 4.73KΩ, the equivalent capacitance 103 is 76pF, and the variable capacitor 2 is 0pF, variable resistor 3 is ∞KΩ. The current value passing through the equivalent inductor 101 is 9.2mA, and the current value passing through the equivalent resistance 102 is 298.9uA. The resonant frequency of the antenna is 13.56MHZ, the quality factor of the antenna is 30, and the bandwidth of the antenna is 450KHZ.

[0055] Such as Figure 5 As shown, when th...

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Abstract

The invention relates to a tuning antenna and a tuning method, comprising an antenna coil, a variable capacitor and a variable resistor; the antenna coil and the variable capacitor are connected in parallel with the variable resistor; the variable capacitor and the variable A resistor, which is used to adjust the capacitance value of the variable capacitor when the electrical properties of the antenna coil change, so that the resonant frequency of the antenna remains unchanged, and then adjust the resistance value of the variable resistor to make the bandwidth of the antenna constant. The invention realizes that when the electrical properties of the antenna coil are affected, the capacitance value of the variable capacitor connected in parallel with the antenna coil is adjusted to keep the resonant frequency of the antenna unchanged; the capacitance value of the variable resistor connected in parallel with the antenna coil is adjusted The resistance value keeps the bandwidth of the antenna unchanged; improves the anti-interference ability of the antenna.

Description

technical field [0001] The invention relates to the field of radio communication, in particular to a method for tuning an antenna. Background technique [0002] Antennas are susceptible to environmental influences such as metals and magnetic materials, causing their resonant frequency to change. At present, capacitor tuning is commonly used to restore the resonant frequency, but at this time the quality factor of the circuit has also changed. According to the quality factor, resonant frequency and bandwidth The constraint relationship, the change of the quality factor will affect the accuracy of the bandwidth. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a tuning antenna and a tuning method, which keep the resonant frequency and bandwidth of the antenna unchanged. [0004] The technical scheme that the present invention solves the problems of the technologies described above is as follows: [0005] A tuned a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q23/00H01Q7/00H01Q1/50
Inventor 向勇赵正爽刘恒高诗光王维路凯
Owner INST OF ELECTRONICS & INFORMATION ENG OF UESTC IN GUANGDONG