CN214227101U - Novel waveguide band-pass filter - Google Patents
Novel waveguide band-pass filter Download PDFInfo
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- CN214227101U CN214227101U CN202120436998.5U CN202120436998U CN214227101U CN 214227101 U CN214227101 U CN 214227101U CN 202120436998 U CN202120436998 U CN 202120436998U CN 214227101 U CN214227101 U CN 214227101U
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- resonant cavity
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Abstract
The utility model provides a novel waveguide band pass filter, including last cavity and lower cavity, go up cavity and lower cavity cooperation installation back formation filter body, filter body both ends all are provided with the inner chamber, and the cavity between the inner chamber at both ends is the resonant cavity, and the inner chamber at both ends all is connected with the resonant cavity, is provided with a plurality of coupling windows in the resonant cavity, and a plurality of coupling windows are separated each other and are set up and leave the interval, and interval part between the adjacent coupling window is provided with electric capacity loading spine, and two coupling windows that are located the resonant cavity both ends communicate with the inner chamber at both ends respectively. The utility model provides a present because the existence of higher order parasitic resonance mode for the waveguide band pass filter's of standard form second passband is very close with fundamental mode work passband, is located about the 1.5 times frequency of fundamental mode passband frequency, and this high-end stop band performance that also leads to standard waveguide band pass filter is relatively poor, is less than the stop band suppression of passband low frequency end, and this kind of difference is more obvious problem when the wide of wave filter passband bandwidth.
Description
Technical Field
The utility model relates to a wave filter field, more specifically relates to a novel waveguide band pass filter.
Background
A filter is a frequency-selective device that passes certain frequency components of a signal while significantly attenuating other frequency components. By using the frequency selection function of the filter, interference noise can be filtered out or spectrum analysis can be carried out. In other words, any device or system that can pass a specific frequency component of a signal and greatly attenuate or suppress other frequency components is called a filter. The filter is a device for filtering waves. "wave" is a very broad physical concept, and in the field of electronics, is narrowly limited to refer specifically to processes that describe the variation of values of various physical quantities over time. This process is converted into a time function of voltage or current, called time waveform of various physical quantities, or called signal, by the action of various sensors. Since the argument time is continuously valued, it is called a continuous time signal, which is also conventionally called an analog signal.
The conventional waveguide band-pass filter consists of a resonant cavity and a coupling window, wherein the waveguide mode of the waveguide resonant cavity is TE10 mode; meanwhile, the resonant cavity can also have a plurality of other high-order resonant modes, wherein the lowest resonant frequency is closest to the frequency of the main mode (TE10 mode), and the highest-order parasitic resonant modes such as TE01, TE20 and the like exist, and the lowest frequency of the high-order parasitic resonant modes is only close to 1.5-2 times of the frequency of the main mode. Due to the existence of the high-order parasitic resonance modes, the second passband of the standard waveguide bandpass filter is very close to the main mode working passband and is positioned at about 1.5 times of the frequency of the main mode passband, so that the high-end stopband performance of the standard waveguide bandpass filter is poor and is lower than the stopband rejection at the low-frequency end of the passband, and the difference is more obvious when the passband bandwidth of the filter is wider.
SUMMERY OF THE UTILITY MODEL
The utility model provides a novel waveguide band pass filter, in order to solve present because the existence of higher order parasitic resonance mode, make the second passband of the waveguide band pass filter of standard form very close with master mode work passband, lie in about 1.5 times frequency of master mode passband frequency, this high-end stop band performance that also leads to standard waveguide band pass filter is relatively poor, be less than the stop band suppression of passband low frequency end, this kind of difference is more obvious problem when the wide of filter passband bandwidth.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
the utility model provides a novel waveguide band pass filter, including last cavity and lower cavity, go up the cavity and form the filter body with cavity cooperation installation back down, the filter body both ends all are provided with the inner chamber, the cavity between the inner chamber at both ends is the resonant cavity, the inner chamber at both ends all is connected with the resonant cavity, be provided with a plurality of coupling windows in the resonant cavity, a plurality of coupling windows are separated each other and are set up and leave the interval, interval part between the adjacent coupling window is provided with electric capacity loading spine, a plurality of coupling windows use electric capacity loading spine to separate each other the setting as the interval promptly, two coupling windows that are located the resonant cavity both ends communicate with the inner chamber at both ends respectively.
Further, the capacitive loading ridges are arranged laterally within the resonant cavity.
Further, the filter body is provided with a flange at the outward side of the inner cavity.
Furthermore, the filter body is provided with a soldering tin groove at one side of the resonant cavity facing outwards.
Further, the solder slots are distributed along the edges of the cavity.
Furthermore, the surface of the filter body is provided with a nickel-plated silver layer.
Further, the surface of the nickel-plated silver layer is coated with brown-green paint.
Further, the outer edge of the filter body is provided with a chamfer.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses an increase horizontal electric capacity loading spine in the waveguide resonant cavity, compare in standard waveguide resonant cavity, under the unchangeable prerequisite of fundamental mode resonant frequency, can effectively improve second, third and higher order eigen resonant frequency of this resonant cavity, objectively push away this waveguide band pass filter's parasitic passband to higher frequency section, effectively improve waveguide band pass filter's high-frequency end stop band rejection performance. By reasonably designing the size of the transverse capacitor loading ridge, the characteristics of the standard waveguide band-pass filter with out-of-band rejection low-end high and high-end difference can be artificially changed, even the state of high-end rejection high and low-end rejection is achieved, and the frequency selection response range of the waveguide band-pass filter is greatly improved. In addition, compared with the waveguide filter with the same frequency, the length of the waveguide filter can be effectively shortened due to the existence of the capacitive loading ridge, and generally, the length of the waveguide filter adopting the capacitive loading ridge can reach 70% -60% of the length of a standard waveguide filter without the capacitive loading ridge, so that the size of the waveguide filter is effectively reduced, and the weight of a device is reduced.
Drawings
Fig. 1 is a schematic diagram of an external structure of the novel waveguide band-pass filter according to the present invention.
Fig. 2 is a schematic diagram of the internal structure of the novel waveguide band-pass filter of the present invention.
Reference numerals: the filter comprises a filter body 1, an upper cavity 2, a lower cavity 3, an inner cavity 4, a resonant cavity 5, a coupling window 6, a capacitor loading ridge 7, a flange 8 and a soldering tin groove 9.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the presence of a first feature above or below a second feature may encompass direct contact of the first and second features, and may also encompass contact of the first and second features not being in direct contact, but via additional features between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. Including a first feature being directly below and obliquely below a second feature, or simply indicating that the first feature is at a lesser elevation than the second feature, if present below, under or below the second feature.
The present invention will be further described with reference to the following examples, which are only some, but not all, of the examples of the present invention. Based on the embodiments in the present invention, other embodiments used by those skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention is shown for illustrative purposes and is not limited to the above-mentioned structure.
Example one
As shown in fig. 1 and 2, a novel waveguide band-pass filter, including last cavity 2 and lower cavity 3, go up cavity 2 and form filter body 1 after the cavity 3 cooperation installation down, filter body 1 both ends all are provided with inner chamber 4, the cavity between the inner chamber 4 at both ends is resonant cavity 5, the inner chamber 4 at both ends all is connected with resonant cavity 5, be provided with a plurality of coupling windows 6 in the resonant cavity 5, a plurality of coupling windows 6 set up and leave the interval each other at interval, interval part between the adjacent coupling window 6 is provided with electric capacity loading spine 7, i.e. a plurality of coupling windows 6 use electric capacity loading spine 7 to set up as the interval each other, two coupling windows 6 that are located resonant cavity 5 both ends communicate with the inner chamber 4 at both ends respectively.
The capacitive loading ridge 7 is arranged laterally within the resonant cavity 5. The filter body 1 is provided with a flange 8 on the outward side of the cavity 4. The filter body 1 is provided with a soldering tin groove 9 at one side of the resonant cavity 5 which faces outwards. The solder slots 9 are distributed along the edge of the cavity 5. The upper cavity 2 and the lower cavity 3 are connected by soldering through a soldering tin groove 9.
The surface of the filter body 1 is provided with a nickel-plated silver layer. The surface of the nickel and silver plating layer is coated with brown green paint. The outer edge of the filter body 1 is provided with a chamfer.
Example two
The second embodiment is a further optimization of the first embodiment.
The capacitive loading ridges 7 are provided with rounded corners with an R of 0.3 mm.
The width of the solder container 9 is 1.2mm and the depth thereof is 1 mm.
The working principle is as follows:
the conventional waveguide band-pass filter comprises a resonant cavity 5 and a coupling window 6, wherein the waveguide mode of the waveguide resonant cavity is TE10 mode, and meanwhile, the resonant cavity 5 can simultaneously have a plurality of other high-order resonant modes, wherein the lowest resonant frequency, the highest-order parasitic resonant modes such as TE01 and TE20 which are closest to the frequency of a main mode (TE10 mode), and the lowest frequency of the high-order parasitic resonant modes is only 1.5-2 times of the frequency of the main mode. Due to the existence of the high-order parasitic resonance modes, the second passband of the standard waveguide bandpass filter is very close to the main mode working passband and is positioned at about 1.5 times of the frequency of the main mode passband, so that the high-end stopband performance of the standard waveguide bandpass filter is poor and is lower than the stopband rejection at the low-frequency end of the passband, and the difference is more obvious when the passband bandwidth of the filter is wider. The capacitor loading ridge 7 of the patent is used for improving and correcting the inherent characteristic of poor stop band rejection of the high-frequency end of the waveguide low-pass filter.
Compared with a standard waveguide resonant cavity, on the premise that the fundamental mode resonant frequency is not changed, the second, third and higher order fundamental resonant frequencies of the resonant cavity 5 can be effectively improved, the parasitic pass band of the waveguide band-pass filter is objectively pushed to a higher frequency section, and the high-frequency end stop band rejection performance of the waveguide band-pass filter is effectively improved. By reasonably designing the size of the transverse capacitor loading ridge 7, the characteristics of the standard waveguide band-pass filter with out-of-band rejection low-end high and high-end difference can be artificially changed, even the state of high-end rejection high and low-end rejection is achieved, and the frequency selection response range of the waveguide band-pass filter is greatly improved. In addition, compared with the waveguide filter with the same frequency, the length of the waveguide filter can be effectively shortened due to the existence of the capacitive loading ridge 7, and generally, the length of the waveguide filter adopting the capacitive loading ridge 7 can reach 60% -70% of the length of a standard waveguide filter without the capacitive loading ridge 7, so that the size of the waveguide filter is effectively reduced, and the weight of a device is reduced.
The above-mentioned embodiments are provided for illustration and not for limitation, and the changes of the examples and the replacement of equivalent elements should be understood as belonging to the scope of the present invention.
From the above detailed description, it will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof.
Claims (8)
1. The utility model provides a novel waveguide band pass filter, a serial communication port, including last cavity and lower cavity, go up the cavity and form the filter body with cavity cooperation installation back down, the filter body both ends all are provided with the inner chamber, the cavity between the inner chamber at both ends is the resonant cavity, the inner chamber at both ends all is connected with the resonant cavity, be provided with a plurality of coupling windows in the resonant cavity, a plurality of coupling windows are separated each other and are set up and leave the interval, interval part between the adjacent coupling window is provided with electric capacity loading spine, a plurality of coupling windows use electric capacity loading spine to separate each other the setting as the interval promptly, two coupling windows that are located the resonant cavity both ends communicate with the inner chamber at both ends respectively.
2. A novel waveguide bandpass filter as claimed in claim 1 wherein the capacitively loaded ridges are disposed laterally within the resonator.
3. A novel waveguide bandpass filter as claimed in claim 1 wherein the filter body is flanged on the outward side of the cavity.
4. A novel waveguide bandpass filter as claimed in claim 1 wherein the filter body is provided with solder slots on the outward side of the resonator.
5. A novel waveguide bandpass filter as claimed in claim 4 wherein the solder slots are distributed along the edges of the resonator.
6. The novel waveguide bandpass filter of claim 1 wherein the surface of the filter body is coated with nickel and silver plated layers.
7. The novel waveguide bandpass filter of claim 6 wherein the surface of the nickel and silver plated layer is coated with a brownish green paint.
8. A novel waveguide bandpass filter as claimed in claim 1 wherein the outer edge of the filter body is chamfered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120436998.5U CN214227101U (en) | 2021-03-01 | 2021-03-01 | Novel waveguide band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120436998.5U CN214227101U (en) | 2021-03-01 | 2021-03-01 | Novel waveguide band-pass filter |
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| CN214227101U true CN214227101U (en) | 2021-09-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838342A (en) * | 2021-03-01 | 2021-05-25 | 成都欧拉微波元器件有限公司 | Novel waveguide band-pass filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838342A (en) * | 2021-03-01 | 2021-05-25 | 成都欧拉微波元器件有限公司 | Novel waveguide band-pass filter |
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