Electrically controlled variable inductor

Abstract

The invention discloses an electrically controlled variable inductor which comprises a substrate. The electrically controlled variable inductor further comprises a core body, an inductor and a pair of electrodes of the inductor, a current control coil and a pair of electrodes of the current control coil, wherein the inductor and the pair of electrodes of the inductor are printed on the substrate; the current control coil and the pair of electrodes of the current control coil are printed on the substrate; a hole is formed inside the current control coil; and the core body is embedded in the hole. Continuously variable inductance quantity of high-frequency microwave is realized by changing the current of the current control coil.

Description

technical field [0001] The invention relates to an electrically controlled variable inductor, in particular to an electrically controlled variable inductor which can be used in various high-frequency and microwave circuits. Background technique [0002] In the family of electronic devices, the existence of adjustable inductors makes the production of electronic circuits more flexible and convenient. In electronic circuits below several hundred MHz, adjustable inductors have been widely used, such as matching circuits, tuning circuits, etc. However, when the operating frequency is higher, such as above several thousand MHz, the existing centralized parameter adjustable inductors can no longer reflect the characteristics of the inductor, the frequency characteristics deteriorate, the Q value becomes smaller, and the efficiency of the inductor has been lost. [0003] The inductance of the existing adjustable inductor is made of copper enameled wire, with a magnetic core in the...

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Problems solved by technology

However, when the frequency of use is higher, such as above several thousand MHz, the existing centralized parameter adjustable inductors can no longer reflect the characteristics of the inductor, the frequency characteristics deteriorate, the Q value becomes smaller, and the efficiency of the inductor has been lost.

[0003] The inductance of the existing adjustable inductor is made of copper enameled wire, with a magnetic core in the middle. The problem is that it is large in size and it is difficult to meet the miniaturization requirements of the radio frequency circuit. We know that the circuit of the radio frequency system generally needs shielding metal box, the larger the volume (height) of the device, the larger the space it occupies, and the greater the processing cost of its shielding box; since the inductance is a copper wire-wound inductor, not a radio frequency strip line, its radio frequency characteristics are not high. Its self-resonant frequency is several GHz, but its working frequency is difficult to achieve above 2GHz. In addition, in order to maintain the airtightness and fixity of the coil, the bracket is usually filled with resin, which is only suitable for manual soldering and wave soldering, not suitable for Automatic reflow soldering

In addition, the processing of copper wire winding is complex and mass production requires many machines to work at the same time, which is time-consuming and labor-intensive.

[0004] In addition, the existing manual mechanical adjustment of inductance has its disadvantages: the self-resonant frequency is not high, it cannot be adjusted by electronic control, the adjustment accuracy is not easy to control, and it is large in size, etc.

When high self-resonant frequency, high-precision adjustment, and fast adjustment of inductance are required, the requirements cannot be met

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