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Intermediate-frequency electrically tunable band-pass filter having fixed inductance value

A band-pass filter and inductance technology, applied in the field of filters, can solve the problems of weak low frequency suppression capability, large inductance, difficult winding, etc., and achieve the effects of real-time adjustability, fast tuning speed and low cost

Active Publication Date: 2016-03-16
DFINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing band-pass electronically tunable filter has weak low-frequency suppression ability, large inductance, and difficult winding

Method used

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  • Intermediate-frequency electrically tunable band-pass filter having fixed inductance value
  • Intermediate-frequency electrically tunable band-pass filter having fixed inductance value
  • Intermediate-frequency electrically tunable band-pass filter having fixed inductance value

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Embodiment 1

[0033] Such as figure 2 As shown, an intermediate frequency electronically adjustable bandpass filter with fixed inductance includes an input port 1, a first coupling capacitor 2, a second coupling capacitor 3, a third coupling capacitor 4, a fourth coupling capacitor 5, and a fifth coupling capacitor Capacitor 6, output port 7, first inductor 8, second inductor 9, third inductor 10, fourth inductor 11, first compensation capacitor 12, second compensation capacitor 13, third compensation capacitor 14, fourth compensation capacitor 15 , the first decoupling capacitor 16, the second decoupling capacitor 17, the third decoupling capacitor 18, the fourth decoupling capacitor 19, the first varactor diode 20, the second varactor diode 21, the third varactor diode 22, A fourth varactor diode 23 , a first isolation resistor 24 , a second isolation resistor 25 , a third isolation resistor 26 , a fourth isolation resistor 27 and an electrical tuning port 28 .

[0034] The input port 1...

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PUM

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Abstract

The invention discloses an intermediate-frequency electrically tunable band-pass filter having a fixed inductance value. The intermediate-frequency electrically tunable band-pass filter comprises an input port, at least two coupled circuits and an output port, which are connected in sequence; the connection point of the adjacent two coupled circuits is also connected to a resonance circuit; and the resonance circuit is also connected to an electrically tunable port. According to the invention, Chebyshev response of a capacity coupling fixed low-inductance resonance unit is adopted, such that the low-frequency-band suppression capability is greatly improved; the pass-band frequency can be changed along with bias voltage; therefore, the pass-band frequency has real-time adjustability and can dynamically satisfy requirements in different working environments; a tunable component is a variable-capacitance diode; the intermediate-frequency electrically tunable band-pass filter disclosed by the invention is matured in technology, easy to obtain and low in cost; compared with the YIG filter, the intermediate-frequency electrically tunable band-pass filter has the advantages of being rapid in tunable speed and low in loss; because a plane structure is adopted, large-batch production requirements can be satisfied; and the intermediate-frequency electrically tunable band-pass filter is small in volume, light in weight and high in integration degree.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to an intermediate-frequency electric-tunable band-pass filter with fixed inductance. Background technique [0002] The magnetron transmitter is favored by old-fashioned weather radars or ranging radars due to its high power, simple structure, and high frequency. However, due to the poor accuracy of the magnetron transmission frequency, which is only 400ppm, the IF filter of the receiver needs to be one-to-one. Matching the adjustment of the intermediate frequency frequency will waste a lot of manpower and material resources of component manufacturers and complete machine manufacturers. Therefore, a tunable filter is needed to solve the above problems. [0003] Due to the high gain at the low end of the amplifier, in order to improve efficiency, switching power supplies are commonly used in the circuit of the whole machine. The switching power supply frequency has rich harmonic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/12
CPCH03H7/12
Inventor 赵天新陈波徐克兴
Owner DFINE TECH
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