CN211860062U

CN211860062U - Frequency hopping filter

Info

Publication number: CN211860062U
Application number: CN202020144278.7U
Authority: CN
Inventors: 温海平; 梁远勇; 徐诗尧
Original assignee: Justiming Electronic Technology Shanghai Co ltd
Current assignee: Justiming Electronic Technology Shanghai Co ltd
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2020-11-03
Anticipated expiration: 2030-01-22

Abstract

The embodiment of the utility model discloses frequency hopping filter. The frequency hopping filter comprises a first coupling module, a second coupling module and a third coupling module, wherein the first coupling module is used for carrying out denoising processing on an input electric signal; the first capacitive resonance module is connected with the first coupling module and is used for carrying out frequency selection on the denoised electric signal; the first capacitance resonance module comprises a first capacitance resonance subunit and a plurality of second capacitance resonance subunits, and the first capacitance resonance subunit and each second capacitance resonance subunit are connected in parallel; the first capacitance harmonic oscillator unit comprises an adjustable capacitor and a first inductor which are connected in parallel. The miniaturized high-power design of the frequency hopping filter is realized, and the wide-frequency-band and high-precision adjustment of the capacitance of the frequency hopping filter is also realized.

Description

Frequency hopping filter

Technical Field

The embodiment of the utility model provides a relate to electronic communication technical field, especially relate to a frequency hopping filter.

Background

The frequency hopping filter is generally used in a former stage of a low noise amplifier at a transmitting end or a latter stage of a low noise amplifier at a receiving end, and functions as a tunable band-pass filter. It is a spread spectrum technique, and its outstanding advantages are high security and high anti-interference performance. The method is widely applied to main frequency hopping communication for resisting electronic interference of enemies, lateral positioning, interception, eavesdropping and the like.

At present, the conventional frequency hopping filter can adjust the frequency by changing the capacitance in the band pass filter, and there are two common ways of changing the capacitance: one is that varactor realizes frequency modulation, and the other is that PIN diode realizes frequency modulation, but has the following problems: the voltage born by the variable capacitance diode is low, and the output power of the corresponding frequency hopping filter is also low; the PIN diode bears high voltage, but under the actual condition, the product size is larger due to the fact that the PIN diodes are connected in parallel and the frequency and capacitance are adjusted by the aid of the capacitor with higher precision, and therefore the frequency hopping filter with small size and high power becomes the problem to be solved at present.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a frequency hopping filter to realize the miniaturized high-power design of frequency hopping filter, still realized frequency hopping filter broad band, high accuracy and adjusted.

The embodiment of the utility model provides a frequency hopping filter, this frequency hopping filter includes first coupling module, the first coupling module is used for removing noise to the electric signal of input and handles;

the first capacitive resonance module is connected with the first coupling module and is used for carrying out frequency selection on the denoised electric signal; the first capacitance resonance module comprises a first capacitance resonance subunit and a plurality of second capacitance resonance subunits, and the first capacitance resonance subunit and each second capacitance resonance subunit are connected in parallel; the first capacitor harmonic oscillator unit comprises an adjustable capacitor and a first inductor which are connected in parallel;

optionally, the impedance matching module is connected to the first capacitor resonance module, and is configured to output the maximum power of the frequency-selected electrical signal.

Optionally, the adjustable capacitor is a capacitor adjusting chip, the capacitor adjusting chip includes a first input pin, a first output pin, a control pin, and a plurality of capacitor units, the capacitor unit includes a first fixed-value capacitor and a switch, and the plurality of capacitor units are connected in parallel between the first input pin and the first output pin.

Optionally, the second capacitor harmonic oscillator unit includes a second fixed capacitor, a second inductor, and a PIN diode, a first end of the second fixed capacitor is connected to the first inductor, a second end of the second fixed capacitor is connected to a first end of the second inductor and a cathode of the PIN diode, a second end of the second inductor is used as a control signal input end, and an anode of the PIN diode is grounded; the number of the second capacitor harmonic oscillator units is smaller than or equal to a preset value.

Optionally, the preset value is 3.

Optionally, the first coupling module includes any one of an inductor, a capacitor, and a transformer.

Optionally, the impedance matching module includes a capacitor and an inductor, a connection point of the capacitor and the inductor is a first end of the impedance matching module, and the other ends of the capacitor and the inductor are respectively used as a second end and a ground end of the impedance matching module, or the other ends of the capacitor and the inductor are respectively used as a ground end and a second end of the impedance matching module.

Optionally, the impedance matching circuit further comprises a second capacitive resonance module and a second coupling module which are connected in series, wherein the second capacitive resonance module is connected in series with the impedance matching module.

Optionally, the structure of the second capacitive resonance module is the same as the structure of the first capacitive resonance module.

Optionally, the second coupling module and the first coupling module have the same structure.

The embodiment of the utility model provides an in the embodiment of the first coupling module link to each other with first electric capacity resonance module, first coupling module is used for removing the processing of making an uproar to the electric signal of input, then first electric capacity resonance module is used for removing the electric signal after making an uproar and carries out the frequency selection, first electric capacity resonance module includes the second electric capacity harmonic oscillator unit of first electric capacity harmonic oscillator unit and a plurality of series connection, first electric capacity harmonic oscillator unit includes adjustable electric capacity and first inductance. The mode that the adjustable capacitor in the first capacitor resonance module is combined with the PIN diode in the second capacitor resonance subunit is adopted, and the capacitor adjusting chip controls the on and off of the capacitors with different capacitance values, so that the number of the second capacitor resonance subunits connected in series is reduced, the problem of large volume of the frequency hopping filter in the prior art is solved, and the miniaturized design of the frequency hopping filter is realized; in addition, a PIN diode is adopted in the second capacitor harmonic oscillator unit and can bear higher voltage, so that the frequency hopping filter realizes high-power output on the basis of miniaturization design. The capacitance adjusting chip controls the on and off of different capacitances, the capacitance value is adjusted flexibly, and the precision of capacitance frequency modulation is improved on the basis of realizing broadband output.

Drawings

Fig. 1 is a block diagram of a frequency hopping filter according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a frequency hopping filter according to an embodiment of the present invention;

fig. 3 is an internal circuit diagram of an adjustable capacitor according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of another frequency hopping filter according to an embodiment of the present invention;

fig. 5 is a circuit diagram of a second capacitor resonator unit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a frequency hopping filter according to a second embodiment of the present invention;

fig. 7 is an internal circuit diagram of impedance matching according to the second embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a block diagram of a frequency hopping filter according to an embodiment of the present invention. As shown in fig. 1, the frequency hopping filter includes a first coupling module 10 and a first capacitive resonance module 20, where the first coupling module 10 is configured to perform denoising processing on an input electrical signal, and the first capacitive resonance module 20 is connected to the first coupling module 10 and configured to perform frequency selection on the denoised electrical signal. Fig. 2 is a schematic structural diagram of a frequency hopping filter according to a first embodiment of the present invention, as shown in fig. 2, a first capacitance resonance module 20 includes a first capacitance resonator unit 21 and a plurality of second capacitance resonator units 22, and the first capacitance resonator unit 21 and each of the second capacitance resonator units 22 are connected in parallel; the first capacitive resonant subunit 21 includes an adjustable capacitor 211 and a first inductor L1 connected in parallel.

Optionally, fig. 3 is an internal circuit diagram of the adjustable capacitor provided in the first embodiment of the present invention, referring to fig. 3, the adjustable capacitor 211 is a capacitor adjusting chip, the capacitor adjusting chip includes a first input pin RF1, a first output pin RF2, a control pin (not shown in the figure), and a plurality of capacitor units, the capacitor units include a first fixed value capacitor C1 and a switch K1, and the plurality of capacitor units are connected in parallel between the first input pin RF1 and the first output pin RF 2.

It should be noted that, a plurality of capacitor units are integrated on the capacitance adjusting chip, and the capacitance adjusting chip controls the turning on and off of the capacitances with different sizes, so that the defect that different voltages need to be readjusted when the capacitance frequency selection is adjusted only by adopting a varactor diode in the first capacitance resonance module in the traditional mode is avoided, the adjustment frequency of the capacitance by adopting the capacitance adjusting chip is more flexible, and the precision of capacitance adjustment is improved. Meanwhile, the capacitance adjusting chip can bear high voltage, and the high-power design of the frequency hopping filter is also realized.

Fig. 4 is a schematic structural diagram of another frequency hopping filter according to the first embodiment of the present invention, as shown in fig. 4, optionally, a first end of a third inductor L3 is connected to one end of the adjustable capacitor 211, a second end of the third inductor is electrically connected to the first coupling module 10, so that the connected third inductor L3 and the adjustable capacitor 211 form a capacitive whole, and then perform a resonant function with the first inductor L1 connected in parallel.

Optionally, fig. 5 is a circuit diagram of a second capacitor resonator unit according to a first embodiment of the present invention, referring to fig. 5, the second capacitor resonator unit 22 includes a second fixed capacitor C2, a second inductor L2 and a PIN diode D1, a first end of the second fixed capacitor C2 is connected to the first inductor L1, a second end of the second fixed capacitor C2 is connected to a first end of the second inductor L2 and a cathode of the PIN diode D1, the second end of the second inductor L2 is used as a control signal input end, and an anode of the switching diode D1 is grounded; the number of the second capacitive resonator sub-units 22 is less than or equal to a preset value.

Optionally, the preset value is 3.

Wherein the second capacitor resonance subunit 22 may include an inductor, so that the second resonance subunit 22 and the inductor perform a resonance function. It should be noted that, the first capacitor resonance module 20 of the conventional frequency hopping filter only includes a plurality of second capacitor resonance sub-units 22 connected in parallel, where a second end of the second inductor L2 is a control signal input end, when a negative voltage signal is input, the PIN diode D1 is turned on, the second constant value capacitor C2 is connected, and when an input signal is selected to be a certain frequency, a preset number of second constant value capacitors C2 are connected, where a preset value is usually 10; according to the technical scheme, the first capacitor resonance module 20 adopts a capacitance adjusting mode of combining the adjustable capacitor 21 and the PIN diode D1, the adjustable capacitor 21 is a capacitor adjusting chip, and the control unit controls the capacitor adjusting chip to be connected into a proper capacitor, so that the second capacitor resonance subunit 22 can achieve the effect of wideband adjustment of the capacitor of the traditional frequency hopping filter only by connecting a small number of second constant value capacitors. Optionally, with reference to fig. 5, the preset value of the second capacitor resonator subunit 22 is 3, so that while the performance of the frequency hopping filter is ensured, the number of second fixed capacitors is reduced, and the miniaturized design of the frequency hopping filter is realized, in addition, the second capacitor resonator subunit 22 adopts the PIN diode D1, and the PIN diode D1 can bear higher voltage, so that the frequency hopping filter realizes high-power output on the basis of the miniaturized design.

The embodiment of the utility model provides a link to each other with first electric capacity resonance module 20 through first coupling module 10, first coupling module 10 is used for removing the processing of making an uproar to the signal of telecommunication of input, and first electric capacity resonance module 20 is used for selecting frequently the signal of telecommunication after removing the noise. The first capacitive resonance module 20 comprises a first capacitive resonance subunit 21 and a plurality of second capacitive resonance subunits 22 connected in series, the first capacitive resonance subunit 21 comprising an adjustable capacitance 211 and a first inductance L1. By adopting the mode of combining the adjustable capacitor 211 and the PIN diode D1, the miniaturized high-power design of the frequency hopping filter is realized, the precision of capacitance frequency modulation is improved, and the wide-frequency-band adjustment of the capacitance of the frequency hopping filter is realized.

Example two

Fig. 6 is a schematic structural diagram of a second frequency hopping filter provided in the embodiment of the present invention, the technical scheme provided in this embodiment is further refined on the basis of the above technical scheme, referring to fig. 6, the second frequency hopping filter further includes an impedance matching module 30, and the impedance matching module 30 is connected with the first capacitance resonance module 20, and is used for outputting the maximum power of the electrical signal after frequency selection.

Optionally, the impedance matching module 30 includes a capacitor and an inductor connected in series, fig. 7 is an internal circuit diagram of the impedance matching module provided in the second embodiment, referring to fig. 7, a connection point of the capacitor and the inductor is a first end of the impedance matching module 30, and the other ends of the capacitor and the inductor are respectively used as a second end and a ground end of the impedance matching module 30, or the other ends of the capacitor and the inductor are respectively used as a ground end and a second end of the impedance matching module 30.

In which 50 ohm matching is usually adopted for the output of the input signal, the impedance matching module 30 enables the input signal to be transmitted with the maximum power as possible without being reflected, otherwise, the signal transmission is not performed, and the efficiency is reduced. The impedance matching module 30 is usually implemented by means of series-parallel inductive capacitors.

Illustratively, with continued reference to fig. 6, the first coupling module 10 includes any of an inductor, a capacitor, and a transformer. Optionally, one end of the capacitor is connected to the rf input signal, and the second end of the capacitor is connected to the first end of the first capacitor resonance module 20. Optionally, the first coupling module is a transformer and is magnetic field coupling, and the first coupler is inductor and capacitor and is inductor-capacitor coupling. The input radio frequency signal can be enabled to be isolated from direct current signals and communicated with alternating current signals by adopting inductive-capacitive coupling or magnetic field coupling, and high-frequency signals are communicated with low-frequency signals. And a first coupling module is connected to the output end of the input signal to filter and denoise the input signal.

Optionally, the impedance matching circuit further includes a second capacitive resonance module 40 and a second coupling module 50 connected in series, where the second capacitive resonance module 40 is connected in series with the impedance matching module 30.

Optionally, the second capacitive resonance module 40 has the same structure as the first capacitive resonance module 20.

Wherein, the second capacitive resonance module 40 has the same structure as the first capacitive resonance module 20,

the second capacitive resonance module 40 includes a third capacitive resonator unit and a plurality of fourth capacitive resonator units, and the third capacitive resonator unit and each of the fourth capacitive resonator units are connected in parallel; the third capacitance harmonic oscillator unit comprises an adjustable capacitor and a second inductor which are connected in parallel. The structure of the second capacitive resonance module 40 is the same as the structure of the first capacitive resonance module 20, so that the selective Q value of the frequency hopping filter can be improved, and the performance of the frequency hopping filter can be optimized.

Optionally, the second coupling module 50 and the first coupling module 10 have the same structure.

The second coupling module 50 and the first coupling module 10 may be any one of an inductor, a capacitor and a transformer. Illustratively, when the first coupling module 10 is connected to a capacitor, one end of the capacitor is connected to the rf output signal, and the second end of the capacitor is connected to the first end of the second capacitive resonant module 20, at this time, the first coupling module 10 is capacitively coupled. The first coupling module 10 is connected to a transformer, and the first coupling module 10 is coupled by a magnetic field. The capacitive coupling or the magnetic field coupling can enable an input radio frequency signal to be isolated from direct current, communicated with alternating current, communicated with high frequency and blocked from low frequency. Specifically, the second coupling module 50 is any one of an inductor, a capacitor and a transformer. The frequency-selected signal can be further denoised.

In the technical solution of this embodiment, an impedance matching module 30, a second capacitive resonance module 40, and a second coupling module 50 are added on the basis of the solution of the first embodiment, the impedance matching module 30 is connected to the second capacitive resonance module 40, the second coupling module 50 is connected to the second capacitive resonance module 40, the structure of the second capacitive resonance module 40 is the same as that of the first capacitive resonance module 20, and the structure of the second coupling module 50 is the same as that of the first coupling module 10. According to the embodiment, the small-sized high-power design of the frequency hopping filter is realized, the high precision and wide-frequency adjustment of capacitance frequency modulation are improved, and the selectivity of the frequency hopping filter is further improved.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. A frequency hopping filter, comprising:

the first coupling module is used for carrying out denoising processing on an input electric signal;

the first capacitive resonance module is connected with the first coupling module and is used for carrying out frequency selection on the denoised electric signal; the first capacitance resonance module comprises a first capacitance resonance subunit and a plurality of second capacitance resonance subunits, and the first capacitance resonance subunit and each second capacitance resonance subunit are connected in parallel; the first capacitance harmonic oscillator unit comprises an adjustable capacitor and a first inductor which are connected in parallel.

2. The frequency hopping filter of claim 1, further comprising an impedance matching module connected to the first capacitive resonant module for maximizing power output of the frequency-selected electrical signal.

3. The frequency hopping filter of claim 1, wherein the tunable capacitor is a capacitance tuning chip, the capacitance tuning chip comprises a first input pin, a first output pin, a control pin, and a plurality of capacitor units, the capacitor units comprise a first fixed value capacitor and a switch, and the plurality of capacitor units are connected in parallel between the first input pin and the first output pin.

4. The frequency hopping filter of claim 1, wherein the second capacitor harmonic oscillator unit comprises a second fixed capacitor, a second inductor and a PIN diode, a first end of the second fixed capacitor is connected to the first inductor, a second end of the second fixed capacitor is connected to the first end of the second inductor and a cathode of the PIN diode, the second end of the second inductor is used as a control signal input end, and an anode of the PIN diode is grounded; the number of the second capacitor harmonic oscillator units is smaller than or equal to a preset value.

5. The frequency hopping filter of claim 4, wherein the predetermined value is 3.

6. The frequency hopping filter of claim 1, wherein the first coupling module comprises any one of an inductor, a capacitor, and a transformer.

7. The frequency hopping filter of claim 2, wherein the impedance matching module comprises a capacitor and an inductor, a connection point of the capacitor and the inductor is a first end of the impedance matching module, and the other ends of the capacitor and the inductor are respectively used as a second end and a ground end of the impedance matching module, or the other ends of the capacitor and the inductor are respectively used as a ground end and a second end of the impedance matching module.

8. The frequency hopping filter of claim 2, further comprising a second capacitive resonance module and a second coupling module connected in series, said second capacitive resonance module being connected in series with said impedance matching module.

9. The frequency hopping filter of claim 8, wherein the second capacitive resonant module has the same structure as the first capacitive resonant module.

10. The frequency hopping filter of claim 8, wherein the second coupling module and the first coupling module are identical in structure.