CN113488749B - 2-18GHz frequency band center frequency continuously adjustable broadband band-stop filter - Google Patents
2-18GHz frequency band center frequency continuously adjustable broadband band-stop filter Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a broadband band-stop filter with continuously adjustable 2-18GHz frequency band center frequency, which comprises four band-stop filtering units working in different frequency bands, wherein the four band-stop filtering units comprise: the microstrip antenna comprises a microstrip main transmission line and a plurality of microstrip resonators periodically distributed on two sides of the microstrip main transmission line along the length direction of the microstrip main transmission line, the microstrip resonators are in slot coupling with the microstrip main transmission line, a variable capacitance diode is loaded on each microstrip resonator, and continuous adjustment of stop band center frequency is realized by changing the loaded capacitance value of the variable capacitance diode. The stop band filter can realize continuous adjustment of the center frequency of a 2-18GHz frequency band, and the adopted micro-strip distributed periodic filter circuit structure can increase the stop band rejection degree, realize good pass band performance and be beneficial to reducing the circuit area.
Description
Technical Field
The invention relates to a communication filter device, in particular to a broadband band-stop filter with continuously adjustable central frequency working in a 2-18GHz frequency band.
Background
The filter is the most important frequency selection component in modern wireless communication networks, and in a radio frequency transceiving system, the filter is required to perform frequency selection filtering on a received signal, and then further amplification and frequency conversion processing are performed through a back-end circuit. With the continuous development of modern communication systems, high-quality, high-speed, high-bandwidth communication puts higher demands on the performance of the filter, and therefore, the performance of the filter, which is the most important frequency selection element in the modern communication system, affects the whole communication system.
Modern radars, wireless communication systems and the like often need the working state of a plurality of frequency bands, and in order to meet the integration level and miniaturization requirements of the system, a radio frequency front end filter circuit with a plurality of filters connected in parallel is usually adopted, so that the requirement on the circuit area is large, and the integration is not facilitated. However, the reconfigurable filter has few related literature reports, adopts a mechanical or magnetic adjusting structure, has a complex frequency adjusting means, and is difficult to integrate and miniaturize.
Disclosure of Invention
The invention aims to solve the problems and provides a broadband band-stop filter with continuously adjustable central frequency, which works in a frequency band of 2-18 GHz.
The invention aims to realize the purpose, and provides a 2-18GHz frequency band center frequency continuously adjustable broadband band-stop filter, which comprises four band-stop filter units working at different frequency bands, wherein the four band-stop filter units are respectively as follows: the band-stop filter comprises a first band-stop filter unit working at a 2-4GHz frequency band, a second band-stop filter unit working at a 4-9GHz frequency band, a third band-stop filter unit working at a 9-13.7GHz frequency band and a fourth band-stop filter unit working at a 13.7-18GHz frequency band;
the four band elimination filter units all comprise: the microstrip antenna comprises a microstrip main transmission line and a plurality of microstrip resonators periodically distributed on two sides of the microstrip main transmission line along the length direction of the microstrip main transmission line, the microstrip resonators are in slot coupling with the microstrip main transmission line, a variable capacitance diode is loaded on each microstrip resonator, and continuous adjustment of stop band center frequency is realized by changing the loaded capacitance value of the variable capacitance diode.
Preferably, the microstrip resonators of the first band-stop filtering unit and the second band-stop filtering unit are both configured as microstrip resonators with short-circuited quarter-wavelength terminals.
Preferably, the microstrip resonators of the third band-stop filter unit and the fourth band-stop filter unit are both configured as half-wavelength open-ended microstrip resonators.
Preferably, the first band-stop filtering unit and the second band-stop filtering unit are both configured as follows: the microstrip resonator comprises a first microstrip line and a second microstrip line, one end of the first microstrip line is grounded through a metalized through hole, the other end of the first microstrip line is connected with one end of the second microstrip line through a variable capacitance diode C1, the other end of the second microstrip line is grounded after being connected with the metalized through hole through a variable capacitance diode C2, cathodes of the variable capacitance diodes C1 and C2 are connected with the second microstrip line, the first microstrip line is in gap coupling with a main microstrip transmission line, and the second microstrip lines of all the microstrip resonators are connected with a direct current voltage bias together through an alternating current isolation resistor and a direct current bias line which are connected in sequence.
Preferably, the third band-stop filtering unit and the fourth band-stop filtering unit are both configured as follows: the microstrip resonator comprises a third microstrip line and a fourth microstrip line, the third microstrip line is vertically connected with the fourth microstrip line, one end of the fourth microstrip line is connected with the metalized through hole through a variable capacitance diode C3 and then grounded, the third microstrip line is in gap coupling with the microstrip main transmission line, and the third microstrip lines of all the microstrip resonators are respectively connected with a direct current voltage bias through an alternating current isolation resistor and a direct current bias line which are sequentially connected.
Preferably, in the first band-stop filtering unit, the length of the first microstrip line is 5.2mm, the length of the second microstrip line is 1mm, the distance between the first microstrip line and the microstrip main transmission line is 0.1mm, and the number of the microstrip resonators is 22; in the second band-stop filtering unit, the length of the first microstrip line is 3.2mm, the length of the second microstrip line is 0.6mm, the distance between the first microstrip line and the microstrip main transmission line is 0.1mm, and the number of the microstrip resonators is 20.
Preferably, in the third stop band filtering unit, the length of the third microstrip line is 4.5mm, the length of the fourth microstrip line is 0.6mm, the distance between the third microstrip line and the microstrip main transmission line is 0.2mm, and the number of the microstrip resonators is 6; in the fourth stop band filtering unit, the length of the third microstrip line is 2.5mm, the length of the fourth microstrip line is 0.6mm, the distance between the third microstrip line and the microstrip main transmission line is 0.1mm, and the number of the microstrip resonators is 6.
Preferably, both ends of the microstrip main transmission line of each band-stop filtering unit are respectively connected with a gating switch, the gating switches are connected with the control end through a digital control circuit, control signals are input through the control end to control the conduction of the corresponding gating switches, and meanwhile, the bias voltage loaded on the variable capacitance diodes in the band-stop filtering units corresponding to the conducted gating switches is adjusted.
The significant advancement of the present invention is at least reflected in:
the broadband band-stop filter can realize continuous adjustment of the central frequency of a 2-18GHz frequency band, adopts a micro-strip distributed periodic filter circuit structure loaded with a varactor, has the characteristics of high suppression degree, low insertion loss and wide adjustment range, can increase the stop-band suppression degree, realizes good passband performance, and is favorable for reducing the circuit area. Meanwhile, the digital circuit is adopted to control the stop band frequency of the filter, so that the integration and digitization of the whole system are further improved, and the invention can better meet the engineering requirements. In addition, through two different forms of microstrip distributed resonance units, a higher working frequency and good passband performance are realized.
Drawings
FIG. 1 is a circuit diagram of a band-stop filter unit of 2-4GHz band;
FIG. 2 is a circuit diagram of a band-stop filter unit in the frequency band of 9-13.7GHz according to an embodiment;
FIG. 3 is a test performance diagram of the band elimination filter unit of the 2-4GHz frequency band of the embodiment;
FIG. 4 is a test performance diagram of the band-elimination filter unit of the 9-13.7GHz band of the embodiment.
Detailed Description
The present invention is further illustrated in the following description with reference to the drawings, and it should be noted that the embodiments of the present invention are not limited to the examples provided.
Referring to fig. 1-4, the present invention provides the following embodiments:
in the embodiment of the invention, the provided 2-18GHz band center frequency continuously adjustable broadband band-stop filter comprises four band-stop filtering units working at different frequency bands, wherein the four band-stop filtering units respectively comprise: the band-stop filter comprises a first band-stop filter unit working at a 2-4GHz frequency band, a second band-stop filter unit working at a 4-9GHz frequency band, a third band-stop filter unit working at a 9-13.7GHz frequency band and a fourth band-stop filter unit working at a 13.7-18GHz frequency band;
the four band elimination filter units all comprise: the microstrip antenna comprises a microstrip main transmission line and a plurality of microstrip resonators periodically distributed on two sides of the microstrip main transmission line along the length direction of the microstrip main transmission line, the microstrip resonators are in slot coupling with the microstrip main transmission line, a variable capacitance diode is loaded on each microstrip resonator, and continuous adjustment of stop band center frequency is realized by changing the loaded capacitance value of the variable capacitance diode.
In the above embodiment, the frequency adjustment range of 2 GHz-18 GHz is divided into four frequency bands, which correspond to the four independently adjustable band-stop filtering units, and the work of different band-stop filtering units can be switched, so that the continuous adjustability of the stop band in the whole frequency range of 2 GHz-18 GHz is realized. Furthermore, the band-stop filtering unit adopts a 50-ohm microstrip main transmission line, and a plurality of microstrip resonators are distributed on two sides of the band-stop filtering unit, so that energy in stop band frequency is coupled to the ground, and the function of band-stop filtering is realized. The microstrip distributed periodic filter circuit structure adopted in the embodiment has the characteristics of high rejection degree, low insertion loss and wide adjustment range, and the distributed periodic filter circuit structure can increase the stop band rejection degree, realize good passband performance and be beneficial to reducing the circuit area.
Referring to fig. 1, in some embodiments, the microstrip resonators of the first and second band-stop filtering units are configured as microstrip resonators with short-circuited quarter-wave terminals, each of the microstrip resonators may be equivalent to an LC parallel resonance structure, and the J/K converter is implemented by narrow-slot coupling. More specifically, the first band-stop filtering unit and the second band-stop filtering unit are both set as: the microstrip resonator comprises a first microstrip line 2 and a second microstrip line 3, one end of the first microstrip line 2 is grounded through a metalized through hole, the other end of the first microstrip line is connected with one end of the second microstrip line 3 through a variable capacitance diode C1, the other end of the second microstrip line 3 is grounded after being connected with the metalized through hole through the variable capacitance diode C2, cathodes of the variable capacitance diodes C1 and C2 are connected with the second microstrip line 3, the first microstrip line 2 is in gap coupling with a main microstrip transmission line 1, and second microstrip lines of all the microstrip resonators are connected with a direct current voltage bias together through alternating-current resistors (provided with R1 and R2 in the embodiment) and a direct current bias line 4 which are connected in sequence. The resonance frequency of the microstrip resonator is determined by inductance value capacitance values of the microstrip lines (the first microstrip line 2 and the second microstrip line 3) and loading capacitance values of the variable capacitance diodes (C1 and C2), and continuous adjustment of the center frequency of the stop band can be realized by changing the loading capacitance values of the variable capacitance diodes.
Referring to fig. 2, in some embodiments, the microstrip resonators of the third and fourth bandstop filter units are configured as half-wavelength open-ended microstrip resonators, each of which may be equivalent to an LC parallel resonance structure, and implement a J/K converter through narrow slot coupling. Specifically, the third band-stop filtering unit and the fourth band-stop filtering unit are both set as: the microstrip resonator comprises a third microstrip line 5 and a fourth microstrip line 6, the third microstrip line 5 is vertically connected with the fourth microstrip line 6, one end of the fourth microstrip line 6 is connected with the metalized through hole through a variable capacitance diode C3 and then grounded, the third microstrip line 5 is in gap coupling with the microstrip main transmission line 1, and the third microstrip lines 5 of all the microstrip resonators are respectively connected with a direct current voltage bias together through sequentially connected alternating-current resistors (in the embodiment, two alternating-current resistors R3 and R4 are arranged) and a direct current bias line. Similarly, in this embodiment, the resonant frequency of the microstrip resonator is determined by the inductance value and capacitance value of the microstrip lines (the third microstrip line 5 and the fourth microstrip line 6) and the loading capacitance value of the varactor diode (C3), and the continuous adjustment of the center frequency of the stop band can be realized by changing the loading capacitance value of the varactor diode.
In the above embodiment, the microstrip resonators with different structures are used in different frequency bands, so that the overall circuit area is reduced, the passband performance of the filter is optimized, and the signal loss is reduced. The half-wavelength open-circuit microstrip resonator loaded with the variable capacitance diode is used in the high-frequency band, and the number of the microstrip resonators is reduced, so that the use of the variable capacitance diode is reduced, and the cost of the whole filter is reduced.
It can be understood that, in the first and second band-stop filtering units, the first microstrip line is in slot coupling with the main microstrip transmission line, that is, has a coupling space S, similarly, in the third and fourth band-stop filtering units, the third microstrip line is in slot coupling with the main microstrip transmission line, has the same coupling space S, and can change the coupling strength by adjusting the coupling space S, thereby changing the bandwidth and the stop-band rejection of the whole band-stop filtering unit, and can change the bandwidth and the resonator resonance frequency by adjusting the length of the microstrip lines (the first to fourth microstrip lines), and the number of microstrip resonators on both sides of the microstrip main transmission line can be increased to increase the stop-band rejection, thereby reducing the bandwidth. Therefore, according to the frequency and the suppression degree index required by design, the coupling space S, the length of the microstrip line and the number of the microstrip resonators loaded on two sides of the microstrip main transmission line can be reasonably selected.
As a preferred embodiment, the width of the microstrip main transmission line 1 is 1.52mm, in the first band-stop filter unit, the length of the first microstrip line 2 is 5.2mm, the length of the second microstrip line 3 is 1mm, the distance between the first microstrip line 2 and the microstrip main transmission line 1 is 0.1mm, and the number of the microstrip resonators is 22, so as to achieve 30dB stop-band rejection and a wider adjustment range; in the second band-stop filtering unit, the length of the first microstrip line 2 is 3.2mm, the length of the second microstrip line 3 is 0.6mm, the distance between the first microstrip line 2 and the microstrip main transmission line 1 is 0.1mm, and the number of the microstrip resonators is 20. Further preferably, in the third stop band filtering unit, the length of the third microstrip line 5 is 4.5mm, the length of the fourth microstrip line 6 is 0.6mm, the distance between the third microstrip line 5 and the microstrip main transmission line 1 is 0.2mm, and the number of the microstrip resonators is 6; in the fourth stop band filtering unit, the length of the third microstrip line 5 is 2.5mm, the length of the fourth microstrip line 6 is 0.6mm, the distance between the third microstrip line 5 and the microstrip main transmission line 1 is 0.1mm, and the number of the microstrip resonators is 6. Referring to fig. 3 and fig. 4, fig. 3 is a test performance diagram of the band elimination filter unit in the 2-4GHz band of the present embodiment, and fig. 4 is a test performance diagram of the band elimination filter unit in the 9-13.7GHz band of the present embodiment; the band elimination filter provided by the embodiment can realize continuous adjustability of the center frequency of a 2-18GHz frequency band, has the characteristics of high suppression degree, low insertion loss and wide adjustment range, and realizes good passband performance.
For reducing the filter volume, with four sections filter circuit processing on same piece of circuit board, use aluminium system shielding cavity to encapsulate, holistic filter encapsulation cavity volume is: 200mm to 100mm to 60mm.
In some embodiments, both ends of the microstrip main transmission line of each band-stop filtering unit are respectively connected with a gating switch, the gating switches are connected with the control end through a counting digital control circuit, control signals are input through the control end so as to control the conduction of the corresponding gating switches, and meanwhile, bias voltage loaded on the variable capacitance diodes in the band-stop filtering units corresponding to the conducted gating switches is adjusted. For the frequency reconfigurable mode in the invention, the capacitance value of the variable capacitance diode working in a reverse bias state is adjusted, so that the resonant frequency of the whole resonator is changed to adjust the stop band frequency of the whole filter. Different voltage values are output through the digital control circuit, different stop band frequencies are correspondingly scanned, and therefore the approximate relation between the frequency and the voltage is obtained. The computer inputs corresponding stop band frequency, and is connected with the digital control circuit through a communication protocol, and the digital circuit outputs corresponding control voltage, so that the expected stop band frequency is achieved.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
- The continuously adjustable broadband band-stop filter with the frequency band center frequency of 1.2-18GHz is characterized by comprising four band-stop filtering units working at different frequency bands, wherein the four band-stop filtering units respectively comprise: the band-stop filter comprises a first band-stop filter unit working at a 2-4GHz frequency band, a second band-stop filter unit working at a 4-9GHz frequency band, a third band-stop filter unit working at a 9-13.7GHz frequency band and a fourth band-stop filter unit working at a 13.7-18GHz frequency band;the four band elimination filter units all comprise: the microstrip main transmission line and the plurality of microstrip resonators are periodically distributed on two sides of the microstrip main transmission line along the length direction of the microstrip main transmission line, the microstrip resonators are in slot coupling with the microstrip main transmission line, a variable capacitance diode is loaded on each microstrip resonator, and continuous adjustment of stop band center frequency is realized by changing the loaded capacitance value of the variable capacitance diode; the first band-stop filtering unit and the second band-stop filtering unit are both set as follows: the microstrip resonator comprises a first microstrip line and a second microstrip line, one end of the first microstrip line is grounded through a metalized through hole, the other end of the first microstrip line is connected with one end of the second microstrip line through a variable capacitance diode C1, the other end of the second microstrip line is grounded after being connected with the metalized through hole through a variable capacitance diode C2, cathodes of the variable capacitance diodes C1 and C2 are connected with the second microstrip line, the first microstrip line is in gap coupling with a main microstrip transmission line, and the second microstrip lines of all the microstrip resonators are connected with a direct current voltage bias through an alternating current resistor and a direct current bias line which are connected in sequence.
- 2. The wideband band-stop filter according to claim 1, wherein the microstrip resonators of the first and second band-stop filtering units are each configured as a quarter-wave shorted-ended microstrip resonator.
- 3. The wideband band-stop filter according to claim 2, wherein the microstrip resonators of the third and fourth band-stop filter units are each configured as half-wavelength open-ended microstrip resonators.
- 4. A wideband band reject filter according to claim 3, characterised in that the third and fourth band reject filter units are each arranged to: the microstrip resonator comprises a third microstrip line and a fourth microstrip line, the third microstrip line is vertically connected with the fourth microstrip line, one end of the fourth microstrip line is connected with the metalized through hole through a variable capacitance diode C3 and then grounded, the third microstrip line is in gap coupling with the microstrip main transmission line, and the third microstrip lines of all the microstrip resonators are respectively and jointly connected with a direct current voltage bias through an alternating current isolation resistor and a direct current bias line which are sequentially connected.
- 5. The wideband band-stop filter according to claim 4, wherein in the first band-stop filter unit, the length of the first microstrip line is 5.2mm, the length of the second microstrip line is 1mm, the distance between the first microstrip line and the main microstrip transmission line is 0.1mm, and the number of microstrip resonators is 22; in the second band-elimination filter unit, the length of the first microstrip line is 3.2mm, the length of the second microstrip line is 0.6mm, the distance between the first microstrip line and the microstrip main transmission line is 0.1mm, and the number of the microstrip resonators is 20.
- 6. The wideband band-stop filter according to claim 1, wherein in the third band-stop filter unit, the length of the third microstrip line is 4.5mm, the length of the fourth microstrip line is 0.6mm, the distance between the third microstrip line and the microstrip main transmission line is 0.2mm, and the number of microstrip resonators is 6; in the fourth stop band filtering unit, the length of the third microstrip line is 2.5mm, the length of the fourth microstrip line is 0.6mm, the distance between the third microstrip line and the microstrip main transmission line is 0.1mm, and the number of the microstrip resonators is 6.
- 7. The broadband band-stop filter according to claim 1, wherein both ends of the microstrip main transmission line of each band-stop filtering unit are respectively connected with a gating switch, the gating switches are connected with the control end through a counting digital control circuit, a control signal is input through the control end so as to control the conduction of the corresponding gating switches, and simultaneously, the bias voltage loaded on the variable capacitance diodes in the band-stop filtering units corresponding to the conducted gating switches is adjusted.
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| CN115117580B (en) * | 2022-07-12 | 2024-04-30 | 安徽大学 | High rectangular coefficient semi-lumped millimeter wave filter chip based on cross coupling structure |
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| CN110061333A (en) * | 2019-04-04 | 2019-07-26 | 电子科技大学 | A kind of microwave electricity tune bandstop filter of high degree of suppression and broad tuning range |
| CN110911786A (en) * | 2019-11-28 | 2020-03-24 | 电子科技大学 | Reconfigurable high-rejection dual-band-stop filter |
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| CN202210797U (en) * | 2011-09-28 | 2012-05-02 | 四川九立微波有限公司 | Front end assembly of frequency-selecting receiver of multichannel microwave communication machine |
| CN110061333A (en) * | 2019-04-04 | 2019-07-26 | 电子科技大学 | A kind of microwave electricity tune bandstop filter of high degree of suppression and broad tuning range |
| CN110911786A (en) * | 2019-11-28 | 2020-03-24 | 电子科技大学 | Reconfigurable high-rejection dual-band-stop filter |
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| 《Tunable Bandstop Filter Using Distributed Coupling Microstrip Resonators With Capacitive Terminal》;Qun Li等;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20191216;第30卷(第1期);附图1-5，正文第2节 * |
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