CN117477191A - Frequency hopping band stop filter and communication device - Google Patents
Frequency hopping band stop filter and communication device Download PDFInfo
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- CN117477191A CN117477191A CN202311549361.7A CN202311549361A CN117477191A CN 117477191 A CN117477191 A CN 117477191A CN 202311549361 A CN202311549361 A CN 202311549361A CN 117477191 A CN117477191 A CN 117477191A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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Abstract
The invention discloses a frequency hopping band stop filter and communication equipment, and belongs to the technical field of communication. A frequency hopping band reject filter comprising: the input end of the frequency hopping band stop module is connected with the input end of the frequency hopping band stop filter, and the output end of the frequency hopping band stop module is connected with the output end of the frequency hopping band stop filter; wherein, the frequency hopping band stop module includes: a directional coupling unit and a frequency hopping band pass unit; the input end of the directional coupling unit is connected with the input end of the frequency hopping band stop module, the isolation end of the directional coupling unit is connected with the output end of the frequency hopping band stop module, and the frequency hopping band pass unit is connected between the coupling end of the directional coupling unit and the straight-through end of the directional coupling unit; the passband of the passband-hopping passband unit is adjustable, and the passband of the passband-hopping passband blocking module is determined according to the passband of the passband-hopping passband unit. The embodiment of the invention can flexibly filter out the unnecessary interference signals in the channel, improve the signal quality and improve the communication quality of the communication equipment.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a frequency hopping band reject filter and a communications device.
Background
Currently, the development of the electronic communication field is gradually changed, the communication technology plays an important role in our production and life, but the popularization and application of various electronic and electric devices also bring various complex environmental interferences to the communication industry. The radio frequency interference, especially intermittent radio frequency interference, may bring about problems of reduced network throughput, reduced sensitivity of the radio frequency module, etc., if the radio frequency interference is light, packet loss of data is caused, communication quality is reduced, and if the radio frequency interference is heavy, communication interruption is caused, and the influence caused by the radio frequency interference is very great in both civil and military fields. And thus is critical for suppression of interfering signals.
In the prior art, for radio frequency interference signals, a band-stop filter is generally added on a channel path for filtering. A band-stop filter is a filter that can pass most frequency components but attenuate certain ranges of frequency components to very low levels by changing the impedance of the filter, as opposed to the concept of a band-pass filter. However, the existing band-stop filter is mostly formed by combining a low-pass filter and a high-pass filter in parallel, and can only inhibit interference signals with fixed frequencies. For an interference signal with external frequency change or an interference signal with intra-channel interference frequency change along with the change of the working frequency, the band-stop filter with fixed frequency points is limited, and the corresponding function cannot be exerted. Therefore, the stop band frequency of the existing band-stop filter is difficult to change according to the frequency of the interference signal, and unnecessary interference signals in the channel are difficult to flexibly filter, so that the communication quality of the communication equipment is influenced.
Disclosure of Invention
The invention provides a frequency hopping band stop filter and communication equipment, which are used for flexibly filtering unwanted interference signals in a channel, improving the signal quality and improving the communication quality of the communication equipment.
In a first aspect, an embodiment of the present invention provides a frequency hopping band reject filter, including:
the input end of the frequency hopping band elimination module is connected with the signal input end of the frequency hopping band elimination filter, and the output end of the frequency hopping band elimination module is connected with the signal output end of the frequency hopping band elimination filter;
wherein, the frequency hopping band blocking module comprises: a directional coupling unit and a frequency hopping band pass unit; the input end of the directional coupling unit is connected with the input end of the frequency hopping band stop module, the isolation end of the directional coupling unit is connected with the output end of the frequency hopping band stop module, and the frequency hopping band pass unit is connected between the coupling end of the directional coupling unit and the through end of the directional coupling unit; the passband of the passband-hopping passband-pass unit is adjustable, and the passband-blocking of the passband-blocking module is determined according to the passband of the passband-hopping passband-pass unit.
Optionally, the frequency hopping band stop module includes one frequency hopping band stop unit, a first end of the frequency hopping band stop unit is connected with a coupling end of the directional coupling unit, and a second end of the frequency hopping band stop unit is connected with a through end of the directional coupling unit;
or,
the frequency hopping band stop module comprises at least two frequency hopping band pass units which are connected in cascade; the first end of the first frequency hopping band pass unit is connected with the coupling end of the directional coupling unit, the second end of the former frequency hopping band pass unit is connected with the first end of the latter frequency hopping band pass unit, and the second end of the last frequency hopping band pass unit is connected with the direct end of the directional coupling unit.
Optionally, the frequency hopping band stop module includes at least two frequency hopping band pass units connected in cascade, and the pass frequency bands of the frequency hopping band pass units in the same frequency hopping band stop module are all set to be the same frequency band.
Optionally, the frequency hopping band stop filter includes one frequency hopping band stop module;
or,
the frequency hopping band elimination filter comprises at least two frequency hopping band elimination modules which are connected in cascade; the input end of the first frequency hopping band-stop module is connected with the signal input end, the output end of the former frequency hopping band-stop module is connected with the input end of the latter frequency hopping band-stop module, and the output end of the last frequency hopping band-stop module is connected with the signal output end.
Optionally, the frequency hopping band rejection filter includes at least two frequency hopping band rejection modules connected in cascade, and the rejection bands of the frequency hopping band rejection modules are all set to be the same frequency band, so as to improve the rejection capability of the frequency hopping band rejection filter on signals of the same frequency band.
Optionally, the frequency hopping band rejection filter includes at least two frequency hopping band rejection modules connected in cascade, and the frequency hopping bands of the at least two frequency hopping band rejection modules are set to different frequency bands, so that the frequency hopping band rejection filter supports the rejection of signals of at least two frequency bands.
Optionally, the frequency hopping band elimination module further includes:
the first matching unit is connected between the coupling end of the directional coupling unit and the first end of the frequency hopping band pass unit;
and/or the number of the groups of groups,
and the second matching unit is connected between the straight-through end of the directional coupling unit and the second end of the frequency hopping band pass unit.
Optionally, the directional coupling unit includes: 3dB bridge.
Optionally, the frequency hopping band pass unit includes: a frequency hopping filter.
In a second aspect, an embodiment of the present invention further provides a communication device, including: the frequency hopping band elimination filter provided by any embodiment of the invention.
The frequency hopping band elimination filter provided by the embodiment of the invention is provided with the frequency hopping band elimination module, and the frequency hopping band elimination module is formed by combining the directional coupling unit and the frequency hopping band passing unit, and can convert the pass band of the frequency hopping band passing unit into the frequency hopping band elimination of the frequency hopping band elimination module based on the cooperation of the directional coupling unit so as to realize the band elimination function of the frequency hopping band elimination filter. And for any interference signal (or noise signal) to be filtered, the passband of the passband hopping passband unit is shifted to cover the frequency of the interference signal, so that the passband of the passband hopping passband blocking module can be shifted synchronously, and the passband hopping passband blocking filter can inhibit the interference signal. Based on the above, compared with the band-stop filter with fixed frequency in the prior art, the band-stop filter with the frequency hopping provided by the embodiment of the invention can flexibly filter the unnecessary interference signals in the channel of the communication equipment, realize noise filtering, improve the signal-to-noise ratio, further improve the signal quality and improve the communication quality of the communication equipment.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a frequency hopping band reject filter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a frequency hopping band stop module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an impedance matching circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of another impedance matching circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the working principle of a frequency hopping band stop module according to an embodiment of the present invention;
fig. 6 is an equivalent schematic diagram of a signal transmission path of a frequency hopping band stop module according to an embodiment of the present invention;
fig. 7 is an equivalent schematic diagram of a signal transmission path of another frequency hopping band stop module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another frequency hopping band stop filter according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another frequency hopping band stop filter according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
As mentioned in the background art, the band-reject filter of the existing fixed frequency point cannot perform good filtering for the interference signal of the frequency variation. The cause of the interference signal is briefly described as follows: the frequency of the external interference signal may be changed due to the working condition and environmental factors of the communication device. Furthermore, for the device interior, when there are two or more signals mixed together on the channel, a new modulated signal is formed, most commonly a cubic intermodulation signal; and, after the external wireless signal passes through the nonlinear device, will also produce the new intermodulation frequency signal. For the interference signals in the module or the whole machine, the interference signals are generally difficult to filter, and the communication quality is seriously affected.
To solve the above problems, embodiments of the present invention provide a frequency hopping band stop filter, which may be disposed in a channel of a communication device; the frequency blocking band of the frequency hopping band-stop filter is adjustable, so that the frequency hopping band-stop filter can adjust the frequency blocking band according to the frequency of an interference signal, unnecessary interference signals in a channel can be flexibly filtered, noise filtering is realized, the signal to noise ratio is improved, and the signal quality is further improved. Fig. 1 is a schematic structural diagram of a frequency hopping band stop filter according to an embodiment of the present invention. Referring to fig. 1, the skip band reject filter 100 includes: a frequency hopping band stop module 10. The input end of the frequency hopping band stop module 10 is connected with the signal input end IN of the frequency hopping band stop filter 100, and the output end of the frequency hopping band stop module 10 is connected with the signal output end OUT of the frequency hopping band stop filter 100.
The frequency hopping band stop module 10 includes: a directional coupling unit 11 and a frequency hopping band pass unit 12. The input end NIN of the directional coupling unit 11 is connected with the input end of the frequency hopping band stop module 10, the isolation end NIS of the directional coupling unit 11 is connected with the output end of the frequency hopping band stop module 10, and the frequency hopping band pass unit 12 is connected between the coupling end NC of the directional coupling unit 11 and the through end ND of the directional coupling unit 11; for example, a first end of the frequency hopping band pass unit 12 is connected to the coupling end NC, and a second end of the frequency hopping band pass unit 12 is connected to the through end ND; illustratively, one of the first and second ends of the skip band pass unit 12 is an input end, and the other is an output end. The passband of the passband-hopping passband unit 12 is adjustable, and the passband of the passband-hopping passband-blocking module 10 is determined according to the passband of the passband-hopping passband unit 12.
The directional coupling unit 11 is formed, for example, by a directional coupler, for example: a transmission line is connected between the input terminal NIN and the through terminal ND of the directional coupling unit 11, and a transmission line is connected between the coupling terminal NC and the isolation terminal NIS. When a signal is input from the input terminal NIN, alternating current passes through the transmission line between the input terminal NIN and the through terminal ND, and energy is coupled to the transmission line between the coupling terminal NC and the isolation terminal NIS due to the mutual approach of the two transmission lines, so that energy distribution and signal transmission in the directional coupling unit 11 are realized. By connecting the band-pass filter unit 12 between the through terminal ND and the coupling terminal NC, a signal transmission path between the through terminal ND and the coupling terminal NC can be provided outside the directional coupling unit 11. Then, by reasonably setting parameters such as the length, the coupling degree and the like of each transmission line, the input power of the directional coupling unit 11 can be attenuated most in the passband of the passband hopping passband unit 12, and a better suppression effect on the input signal is realized; whereas outside the passband of the hopping bandpass unit 12 the input signal is made to pass almost intact and output via the isolated terminal NIS. The frequency hopping band pass unit 12 may be configured by using a band pass filter such as an arbitrary frequency hopping filter. For the frequency hopping band pass unit 12, the closer the frequency of its input signal is to the center frequency of its pass band, the higher the amplitude of its output signal is; based on the cooperation of the directional coupling unit 11 and the frequency hopping band pass unit 12, the higher the amplitude of the signal outputted from the frequency hopping band pass unit 12, the lower the amplitude of the signal outputted from the isolated terminal NIS. Therefore, for the entire frequency hopping band stop module 10, the closer the frequency of its input signal is to the center frequency of the passband of the frequency hopping passband unit 12, the lower the amplitude of its output signal is; that is, the blocking band of the skip band blocking module 10 corresponds to the passband of the skip band passband unit 12.
In summary, the band-stop filter 100 provided in the embodiment of the present invention is provided with the band-stop module 10, where the band-stop module 10 is formed by combining the directional coupling unit 11 and the band-stop unit 12, and based on the cooperation of the directional coupling unit 11, the passband of the band-stop unit 12 can be converted into the band-stop of the band-stop module 10, so as to implement the band-stop function of the band-stop filter 100. And, for any interference signal (or noise signal) to be filtered, the passband of the passband filter unit 12 is shifted to cover the frequency of the interference signal, i.e. the passband of the passband filter module 10 can be shifted synchronously, so that the passband filter 100 can suppress the interference signal. Based on this, compared with the band-stop filter with fixed frequency in the prior art, the band-stop filter 100 provided by the embodiment of the invention can flexibly filter out the unnecessary interference signals in the channel of the communication equipment, realize noise filtering, improve the signal-to-noise ratio, further improve the signal quality and improve the communication quality of the communication equipment.
The above embodiments exemplarily illustrate the operation principle of each functional module in the skip-band rejection filter 100, and the following exemplarily illustrates a specific structure that the skip-band rejection filter 100 may have.
Fig. 2 is a schematic structural diagram of a frequency hopping band stop module according to an embodiment of the present invention. Referring to fig. 2, in one embodiment, the frequency hopping band-pass unit 12 optionally includes: the first end N1 of the frequency hopping filter 122 serves as a first end of the frequency hopping band-pass unit 12, and the second end N2 of the frequency hopping filter 122 serves as a second end of the frequency hopping band-pass unit 12. Illustratively, the frequency hopping filter 122 may be an electrically tunable filter or a cavity filter, and the like, and may be specifically configured according to actual requirements.
In short, the frequency hopping band pass unit 12 may be configured by using an existing band pass filter with an arbitrary adjustable pass band. The band pass filter may include a filter array therein; the frequency hopping band stop filter 100 may be provided with a microprocessor, a digital-to-analog converter, etc., or the frequency hopping band pass unit 12 in the frequency hopping band stop filter 100 may be controlled by a microprocessor and a digital-to-analog converter which are redundantly provided in the communication device. In the use process, the microprocessor can be adopted to control the filter array through the digital-to-analog converter so as to adjust the passband of the passband hopping passband unit 12 and realize the filtering function.
With continued reference to fig. 2, on the basis of the above embodiments, the directional coupling unit 11 may optionally include: a 3dB bridge 111. The 3dB bridge 111 may include a first PIN1, a second PIN2, a third PIN3, and a fourth PIN4, wherein, one transmission line is connected between the first PIN PIN1 and the third PIN PIN3, and the other transmission line is connected between the second PIN PIN2 and the fourth PIN PIN 4. The port characteristics of the 3dB bridge 111 can be seen in table 1:
TABLE 1
| Configuration of | PIN1 | PIN2 | PIN3 | PIN4 |
| Power divider | Input device | Isolation of | -3dB∠θ-90 | -3dB∠θ |
| Power divider | Isolation of | Input device | -3dB∠θ | -3dB∠θ-90 |
| Power divider | -3dB∠θ-90 | -3dB∠θ | Input device | Isolation of |
| Power divider | -3dB∠θ | -3dB∠θ-90 | Isolation of | Input device |
| * Power synthesizer | A∠θ-90 | A∠θ | Isolation of | Output of |
| * Power synthesizer | A∠θ | A∠θ-90 | Output of | Isolation of |
| * Power synthesizer | Isolation of | Output of | A∠θ-90 | A∠θ |
| * Power synthesizer | Output of | Isolation of | A∠θ | A∠θ-90 |
As can be seen from table 1, in the embodiment of the present invention, the 3dB bridge 111 is used as a power divider, and in practical application, any pin of the 3dB bridge 111 may be used as an input terminal to connect the input terminal of the frequency hopping band stop module 10. Once the 3dB bridge 111 is defined as the pin of the input terminal, the functional terminals corresponding to the remaining pins are also defined. In fig. 2, the first PIN1 is taken as an input terminal, the second PIN2 is taken as an isolation terminal, the third PIN3 is taken as a through terminal (-3 dB +.theta. -90), and the fourth PIN4 is taken as a coupling terminal (-3 dB +.theta.).
With continued reference to fig. 2, the frequency hopping band stop module 10 further includes, optionally, on the basis of the above embodiments: the first matching unit 13 is connected between the coupling end NC of the directional coupling unit 11 and the first end of the frequency hopping band pass unit 12, and is used for providing an impedance matching function, reducing signal reflection, optimizing a standing wave waveform, and avoiding signal waveform distortion as much as possible.
And/or, the frequency hopping band-stop module 10 further comprises a second matching unit 14, which is connected between the pass-through end ND of the directional coupling unit 11 and the second end of the frequency hopping band-stop unit 12, and is used for providing an impedance matching function, reducing signal reflection, optimizing the standing wave waveform, and avoiding signal waveform distortion as much as possible.
Illustratively, the first matching unit 13 and the second matching unit 14 may be implemented by using any impedance matching circuit such as LC circuit, and the matching impedance may be set according to practical requirements. For example, referring to fig. 3 and 4, the impedance matching circuit may include a capacitor C and an inductor L, the inductor L may be connected between two ends of the matching unit, one end of the capacitor C may be connected to either end of the matching unit, and the other end of the capacitor C is grounded. Alternatively, the positions of the capacitor C and the inductor L may be interchanged as desired. The above-described structure is merely illustrative and not restrictive of the present invention. In practical applications, a user may determine the types and the number of impedance matching elements in the circuit according to the actual requirements, and configure a combination manner and a connection structure between the impedance matching elements, for example, select any one of a resistor, a capacitor and an inductor, or a combination between multiple types of elements.
Fig. 5 is a schematic diagram of the working principle of a frequency hopping band stop module according to an embodiment of the present invention. The following describes the operation principle of the skip band reject filter 100 in detail with reference to fig. 2 and 5 by taking the configuration of fig. 2 as an example.
In fig. 5, a curve S21 shows power characteristics of the frequency hopping band-pass unit 12 at different frequency points, such as a forward transmission coefficient of the frequency hopping filter 122; curve S11 shows the power characteristics of the frequency hopping band stop module 10 at different frequency points, for example, the input reflection coefficient of the frequency hopping band stop module 10. Referring to fig. 2 and 5, taking an example in which the frequency hopping band stop filter 100 includes a frequency hopping band stop module 10 as shown in fig. 2, the frequency hopping band stop filter 100 operates according to the following principle:
the peak position of the corresponding curve S21 is the insertion loss of the current frequency point, in which the insertion loss of the frequency hopping filter 122 is 0dB in the ideal case, and it is assumed that s21=1 and s11=0 at the frequency point, and no energy loss passes through the frequency hopping filter 122, in which case the frequency hopping filter 122 can be equivalently a section of lossless stub, which shorts the third PIN3 and the fourth PIN4 of the 3dB bridge 111. The radio frequency signal (input signal RFIN) enters from the first PIN1 and exits from the second PIN2 (output signal RFOUT) of the 3dB bridge 111. Ideally, the power output by the second PIN PIN2 is PF OUT ＝1-(S21) 2 =0, i.e. the theoretical input power decays to the lowest, corresponding to the valley of curve S11. In practical situations, insertion losses of both the frequency hopping filter 122 and the 3dB bridge 111 should also be accounted for, for example, energy dissipation due to insufficient bridge isolation, losses due to transmission media, etc.
The equivalent transmission circuit of the frequency hopping band stop module can be seen in fig. 6, corresponding to the position of the peak of the curve S21, wherein when the input signal RFIN is transmitted into the first PIN1, the first PIN1 is used as the input terminal of the 3dB bridge 111, each PIN function can be seen in the first row of the power dividers in table 1, the power of the input signal RFIN is distributed to a third PIN PIN3 and a fourth PIN PIN4 respectively, the third PIN PIN3 obtains-3 dB theta-90, the fourth PIN PIN4 obtains-3 dB theta, and the signals on the third PIN PIN3 and the fourth PIN PIN4 are out of phase by 90 degrees. At this time, since the signal frequency point corresponds to the peak value of the curve S21, the frequency hopping filter 122 is equivalent to a section of lossless stub, i.e. the first end N1 and the second end N2 of the frequency hopping filter 122 are equivalent to direct connection, so that signals can be mutually transmitted between the third PIN3 and the fourth PIN 4. Then the third PIN PIN3 may acquire-3 dB +.θ and the fourth PIN PIN4 may acquire-3 dB +.θ -90. On the basis, the third PIN PIN3 takes the acquired signals as input, the functions of the PINs are seen in the third row of the power divider in the table 1, the signals of-3 dB & lt theta & gt can be distributed again, the power transmitted to the first PIN PIN1 and the second PIN PIN2 are the same, and the phases are respectively +. Theta. -90 and +. Theta.; similarly, the fourth PIN PIN4 takes the signal obtained from the fourth PIN PIN4 as input, the functions of each PIN are shown in the fourth row of the power divider in the table 1, the signal of-3 dB & lt theta-90 can be distributed again, the power transmitted to the first PIN PIN1 and the second PIN PIN2 are the same, and the phases are respectively +. Theta-90 and +. Theta-180. Therefore, after the redistribution of the signals, the second PIN PIN2 obtains two signals with the same power and phases of theta and theta-180 respectively, and the two signals cancel each other, so that the theoretical input power is attenuated to the lowest, and the theoretical output corresponds to the S11 valley.
At the valley position of the corresponding curve S21, i.e. at the lowest power point, the value S21 of the frequency hopping filter 122 is very small, for example, -50dB or even smaller, which corresponds to the third PIN3 and the fourth PIN4 of the 3dB bridge 111 being in a 50Ω matching state, but an open circuit state between the two PINs. At this time, the power output by the second PIN PIN2 is PF OUT ＝1-(S21) 2 And 1. Ideally, the signal passes almost intact; in practical situations, the insertion loss of the output end of the frequency hopping band stop module 10 is almost equal to the insertion loss of the 3dB bridge 111.
The equivalent transmission circuit of the frequency hopping band stop module can be seen in fig. 7, where when the input signal RFIN is transmitted into the first PIN1, the first PIN1 is used as the input terminal of the 3dB bridge 111, the functions of the PINs can be seen in the first row of the power dividers in table 1, the power of the input signal RFIN is distributed to a third PIN PIN3 and a fourth PIN PIN4 respectively, the third PIN PIN3 obtains-3 dB theta-90, the fourth PIN PIN4 obtains-3 dB theta, and the signals on the third PIN PIN3 and the fourth PIN PIN4 are out of phase by 90 degrees. At this time, since the signal frequency point corresponds to the valley of the curve S21, the frequency hopping filter 122 is equivalent to an open circuit, as shown by the dashed line in fig. 7, the first end N1 and the second end N2 of the frequency hopping filter 122 are equivalent to being disconnected, and the third PIN3 and the fourth PIN4 cannot transmit signals basically. On the basis, the third PIN PIN3 takes the signals acquired by the third PIN PIN3 as input, the functions of the PINs are seen in the third row of the power divider in the table 1, the signals of-3 dB & lt theta-90 can be distributed again, the power transmitted to the first PIN PIN1 and the second PIN PIN2 are the same in size, and the phases are respectively +. Theta-180 and +. Theta-90; similarly, the fourth PIN PIN4 takes the signal obtained from the fourth PIN PIN4 as input, and the functions of the PINs are shown in the fourth row of the power divider in the table 1, so that the signal of minus 3dB & lt theta can be redistributed, the power transmitted to the first PIN PIN1 and the second PIN PIN2 is the same, and the phases are respectively +thetaand +theta-90. Therefore, after the redistribution of the signals, the second PIN PIN2 obtains two signals with the same power and phase being & lt theta-90, and the two signals are overlapped, so that the theoretical output reaches an S11 peak value.
A similar analysis can be made for the frequency band where the power of the curve S21 in fig. 5 is between the maximum and minimum. The 3dB bridge 111 is a passive device. Ideally, the waveforms of the curve S21 and the curve S11 are interchanged between the first PIN1 and the second PIN2 of the 3dB bridge 111. That is, the frequency hopping band rejection module 10 is equivalent to converting the band pass filter into the band reject filter by the 3dB bridge 111, and the band selection (e.g. shifting the peak of the curve S21 forward or backward in fig. 5) can be achieved by the band pass filter, and the function of the bridge can be matched to convert the pass frequency into the frequency reject function.
The foregoing embodiments exemplarily show that the frequency hopping band stop filter 100 includes one frequency hopping band stop module 10, and that one frequency hopping band stop module 10 includes one frequency hopping band pass unit 12, but are not limited to the present invention. In other embodiments, the number of the frequency hopping band stop modules 10 in the frequency hopping band stop filter 100 and the number of the frequency hopping band pass units 12 in the frequency hopping band stop modules 10 may be flexibly set according to actual requirements, which will be described below.
Fig. 8 is a schematic structural diagram of another frequency hopping band stop filter according to an embodiment of the present invention. Referring to fig. 8, in one embodiment, optionally, at least two hopping band pass units 12 are included in the hopping band stop module 10 that are cascade connected. Wherein a first end of the first frequency hopping band pass unit 1201 is connected to the coupling end NC of the directional coupling unit 11, a second end of the previous frequency hopping band pass unit 12 is connected to a first end of the next frequency hopping band pass unit 12 (e.g., a second end of the first frequency hopping band pass unit 1201 is connected to a first end of the second frequency hopping band pass unit 1202, and so on), and a second end of the last frequency hopping band pass unit 12 is connected to the pass-through end ND of the directional coupling unit 11.
Wherein, when the first matching unit 13 is included in the frequency hopping band-stop module 10, the first matching unit 13 is connected between the coupling terminal NC of the directional coupling unit 11 and the first terminal of the first frequency hopping band-pass unit 1201. When the second matching unit 14 is included in the frequency hopping band-stop module 10, the second matching unit 14 is connected between the pass-through end ND of the directional coupling unit 11 and the second end of the last frequency hopping band-pass unit 12.
Illustratively, the passband of each of the hopping band pass units 12 in the same hopping band stop module 10 is set to the same frequency band to provide a higher suppression capability. Alternatively, the passband of each frequency hopping passband unit 12 in the same frequency hopping passband blocking module 10 may be set to be different according to the requirement, and specifically may be adjusted according to the actual requirement, which is not limited herein.
Fig. 9 is a schematic structural diagram of another frequency hopping band stop filter according to an embodiment of the present invention. Referring to fig. 9, in one embodiment, optionally, at least two skip-band reject modules 10 in a cascade connection may be included in the skip-band reject filter 100; the frequency hopping band stop module 10 may have the structure in any of the embodiments described above. The input of the first skip band block 1001 is connected to the signal input IN, the output of the previous skip band block 10 is connected to the input of the next skip band block 10 (e.g., the output of the first skip band block 1001 is connected to the input of the second skip band block 1002, and so on), and the output of the last skip band block 10 is connected to the signal output OUT.
A skip band reject filter 100 cascaded for a multi-skip band reject module 10:
in one embodiment, the frequency blocking bands of each frequency hopping band blocking module 10 may be optionally set to the same frequency band to improve the rejection capability of the frequency hopping band blocking filter 100 for signals of that frequency band. And, the cascade structure may allow more powerful signals to pass through.
In another embodiment, optionally, the suppression frequency points of each cascade part may be independently controlled to implement suppression of different frequency points. For example, the frequency blocking bands of the at least two frequency hopping band blocking modules 10 may be set to different frequency bands, so that the frequency hopping band blocking filter 100 supports a function of suppressing signals of the at least two frequency bands, and at least two interference peaks can be suppressed.
In practical application, the blocking frequency bands of each cascade part can be flexibly set according to the inhibition requirement.
The above-described structures are all exemplary of the present invention. In practical applications, each functional device in the frequency hopping band-stop filter 100 may be selected according to different indexes, for example, power and suppression capability. The structures of the directional coupling unit, the frequency hopping band pass unit and each matching unit are not limited here, and the target functions thereof may be realized.
In summary, the embodiments of the present invention provide a high suppression frequency hopping band rejection filter, which has low attenuation of a communication band and strong suppression capability of a suppression frequency band, and can flexibly filter out unwanted interference signals in a channel of a communication device.
The embodiment of the invention also provides communication equipment, which comprises the frequency hopping band elimination filter provided by any embodiment of the invention and has corresponding beneficial effects. For example, the communication device may include at least one channel, and in practical application, a corresponding frequency hopping band stop filter may be set in the at least one channel, so as to implement noise filtering of a transmission signal of the channel. Preferably, each channel in the communication device is provided with a corresponding frequency hopping band stop filter so as to ensure the normal communication of the communication device; and, for multi-channel communication devices, the inter-channel isolation may be improved.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A frequency hopping band reject filter, comprising:
the input end of the frequency hopping band elimination module is connected with the signal input end of the frequency hopping band elimination filter, and the output end of the frequency hopping band elimination module is connected with the signal output end of the frequency hopping band elimination filter;
wherein, the frequency hopping band blocking module comprises: a directional coupling unit and a frequency hopping band pass unit; the input end of the directional coupling unit is connected with the input end of the frequency hopping band stop module, the isolation end of the directional coupling unit is connected with the output end of the frequency hopping band stop module, and the frequency hopping band pass unit is connected between the coupling end of the directional coupling unit and the through end of the directional coupling unit; the passband of the passband-hopping passband-pass unit is adjustable, and the passband-blocking of the passband-blocking module is determined according to the passband of the passband-hopping passband-pass unit.
2. The frequency hopping band reject filter of claim 1, wherein the frequency hopping band reject module comprises one frequency hopping band pass unit, a first end of the frequency hopping band pass unit is connected with a coupling end of the directional coupling unit, and a second end of the frequency hopping band pass unit is connected with a pass-through end of the directional coupling unit;
or,
the frequency hopping band stop module comprises at least two frequency hopping band pass units which are connected in cascade; the first end of the first frequency hopping band pass unit is connected with the coupling end of the directional coupling unit, the second end of the former frequency hopping band pass unit is connected with the first end of the latter frequency hopping band pass unit, and the second end of the last frequency hopping band pass unit is connected with the direct end of the directional coupling unit.
3. The frequency hopping band rejection filter according to claim 1, wherein the frequency hopping band rejection module comprises at least two frequency hopping band pass units connected in cascade, and the pass frequency bands of the frequency hopping band pass units in the same frequency hopping band rejection module are all set to be the same frequency band.
4. A frequency hopping block filter as claimed in any one of claims 1 to 3, characterized in that the frequency hopping block filter comprises one of the frequency hopping block modules;
or,
the frequency hopping band elimination filter comprises at least two frequency hopping band elimination modules which are connected in cascade; the input end of the first frequency hopping band-stop module is connected with the signal input end, the output end of the former frequency hopping band-stop module is connected with the input end of the latter frequency hopping band-stop module, and the output end of the last frequency hopping band-stop module is connected with the signal output end.
5. The filter according to claim 4, wherein the filter includes at least two blocks connected in cascade, and the blocks of each block are set to be the same band, so as to improve the suppression capability of the filter to the signals of the same band.
6. The frequency hopping band rejection filter according to claim 4, wherein the frequency hopping band rejection filter comprises at least two frequency hopping band rejection modules connected in cascade, and the frequency rejection bands of the at least two frequency hopping band rejection modules are set to different frequency bands, so that the frequency hopping band rejection filter supports the rejection of signals of at least two frequency bands.
7. The frequency hopping band reject filter of claim 1, wherein the frequency hopping band reject module further comprises:
the first matching unit is connected between the coupling end of the directional coupling unit and the first end of the frequency hopping band pass unit;
and/or the number of the groups of groups,
and the second matching unit is connected between the straight-through end of the directional coupling unit and the second end of the frequency hopping band pass unit.
8. The frequency hopping band reject filter of claim 1, wherein the directional coupling unit comprises: 3dB bridge.
9. The hopping band-reject filter of claim 1, wherein the hopping band-pass unit comprises: a frequency hopping filter.
10. A communication device, comprising: the skip band reject filter of any one of claims 1-9.
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| CN202311549361.7A CN117477191A (en) | 2023-11-20 | 2023-11-20 | Frequency hopping band stop filter and communication device |
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| CN202311549361.7A CN117477191A (en) | 2023-11-20 | 2023-11-20 | Frequency hopping band stop filter and communication device |
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| CN202311549361.7A Pending CN117477191A (en) | 2023-11-20 | 2023-11-20 | Frequency hopping band stop filter and communication device |
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