Zero Cavity Filter

Abstract

The invention discloses a zero cavity filter, wherein a left connecting rib is connected to the rear position of the inner surface of the cavity, an input transmission copper rod is arranged on the right side of the left connecting rib, a resonator is arranged on the right side of the input transmission copper rod, a coupling rib is arranged at the rear of the resonator, a right connecting rib is arranged on the right side of the coupling rib, an output transmission copper rod is connected to the left end face of the right connecting rib, an upper cover plate is arranged above the output transmission copper rod above the cavity, an input connector is connected to the left side of the top end face of the upper cover plate, and a tuning screw is arranged on the right side of the input connector. The strength of the invention can be tuned through the coupling point between the first cavity of the passband cavity and the zero point cavity to meet more detailed use requirements, and at the same time, the product indicators are relatively easy to control, the tuning operation is relatively convenient, the processing cost and the batch cost are relatively low and easy to control, and the invention has extremely strong practicality.

Description

Technical Field

[0001] The present invention belongs to the technical field related to metal filters, and in particular relates to a zero cavity filter. Background Art

[0002] A filter is a filter circuit composed of capacitors, inductors and resistors. The filter can effectively filter out a specific frequency point in the power line or frequencies other than the frequency point to obtain a power signal of a specific frequency, or eliminate a power signal after a specific frequency. The filter is a frequency-selective device that allows specific frequency components in the signal to pass through while greatly attenuating other frequency components. The frequency-selective function of the filter can be used to filter out interference noise or perform spectrum analysis.

[0003] The existing filter technology has the following problems: in the design of metal filters with relatively high frequencies, the size of a single cavity is relatively small due to the frequency. It is relatively difficult to add zero points such as capacitors and inductors in a relatively small single cavity. At the same time, the high processing cost and high assembly error bring certain troubles to users. Summary of the invention

[0004] The purpose of the present invention is to provide a zero cavity filter to solve the problem proposed in the above background technology that in the design of metal filters with relatively high frequencies, the size of a single cavity is relatively small due to the frequency, and it is relatively difficult to add zero points such as capacitors and inductors in a relatively small single cavity. At the same time, the processing cost is high and the assembly error is high, which brings certain troubles to users.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A zero cavity filter comprises a cavity and a left connecting rib, wherein the left connecting rib is connected to the rear position of the inner surface of the cavity, an input transmission copper rod is arranged on the right side of the left connecting rib, a resonator is arranged on the right side of the input transmission copper rod, a coupling rib is arranged behind the resonator, a right connecting rib is arranged on the right side of the coupling rib, an output transmission copper rod is connected to the left end face of the right connecting rib, an upper cover plate is arranged above the output transmission copper rod above the cavity, an input connector is connected to the left side of the top end face of the upper cover plate, a tuning screw is arranged on the right side of the input connector, a cover fixing screw is arranged on the right side of the tuning screw, and an output connector is arranged on the right side of the cover fixing screw.

[0007] Preferably, the top end surface of the cavity is provided with annularly distributed limiting grooves and the inner threads can engage with the outer bolt surface threads, and the upper cover plate can move relative to the cavity.

[0008] Preferably, the bottom end surface of the upper cover plate is fitted with the top end surface of the cavity, and the top end surface of the upper cover plate is provided with cover plate fixing screws distributed in an annular manner.

[0009] Preferably, the tuning screw can rotate relative to the upper cover plate, and the top end surface of the tuning screw is arranged flush with the top end surface of the cover plate fixing screw.

[0010] Preferably, the bottom end surface of the tuning screw is arranged to fit the inner surface of the resonator, the number of the tuning screws and the number of the resonators are matched, and the input connector can be fixedly connected to an external device.

[0011] Preferably, the input connector and the output connector are located at the same horizontal line and are symmetrically distributed, and the input transmission copper rod and the output transmission copper rod can be electrically connected to the input connector and the output connector respectively.

[0012] Preferably, the top end surface of the coupling rib is sunken by one millimeter compared to the top end surface of the cavity, and five resonators are provided and the size specifications of the five resonators are consistent.

[0013] Compared with the prior art, the present invention provides a zero cavity filter, which has the following beneficial effects:

[0014] 1. The present invention adds a separate resonant cavity outside the passband cavity to form a separate zero point. The zero point form can be arbitrarily changed to capacitance or inductance according to index requirements to adapt to different frequency filtering requirements, so that the whole has extremely strong flexibility when used.

[0015] 2. The strength of the present invention can be tuned through the coupling point between the first cavity of the passband cavity and the zero-point cavity to meet more detailed usage requirements. At the same time, the product indicators are relatively easy to control, the tuning operation is relatively convenient, the processing cost and the batch cost are relatively low and easy to control, and it has extremely strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the zero cavity filter proposed by the present invention;

[0018] Figure 2 This is a schematic diagram of the top view of the cover plate proposed by the present invention;

[0019] Figure 3 This is a schematic diagram of the top view of the cavity structure proposed by the present invention;

[0020] Figure 4 It is a left-side structural schematic diagram proposed by the present invention;

[0021] In the figure: 1. Cavity; 2. Cover; 3. Cover fixing screw; 4. Tuning screw; 5. Input connector; 6. Output connector; 7. Input transmission copper rod; 8. Output transmission copper rod; 9. Coupling rib; 10. Resonator; 11. Left connecting rib; 12. Right connecting rib. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] See also Figure 1-4 , the present invention provides a zero cavity filter technical solution:

[0026] The zero cavity filter comprises a cavity 1 and a left connecting rib 11. The top end face of the cavity 1 is provided with a ring-shaped limiting groove and the inner thread can be engaged with the thread on the surface of the external bolt. The upper cover plate 2 can be fixedly connected with the cover plate fixing screw 3 to make the upper cover plate 2 fit with the cavity 1. The left connecting rib 11 is connected to the rear position of the inner surface of the cavity 1. The right side of the left connecting rib 11 is provided with an input transmission copper rod 7. The input transmission copper rod 7 and the output transmission copper rod 8 can be electrically connected to the input connector 5 and the output connector 6 respectively. The electrical connection realizes real-time frequency transmission. The right side of the input transmission copper rod 7 A resonator 10 is arranged on the side, and there are five resonators 10, and the size specifications of the five resonators 10 are all consistent, which can avoid occupying additional use space. The whole is a matching auxiliary setting. A coupling rib 9 is arranged at the rear of the resonator 10. The top end face of the coupling rib 9 is sunken by one millimeter than the top end face of the cavity 1. The coupling rib 9 is relatively small, and the cover fixing screws 3 cannot be added to lock the cavity 1 and the upper cover 2. After sinking, there is no problem of poor grounding. A right connecting rib 12 is arranged on the right side of the coupling rib 9, and the right connecting rib 12 and the left connecting rib 11 are matched and fixed.

[0027] A zero cavity filter, comprising a right connecting rib 12, the left end face of which is connected to an output transmission copper rod 8, an upper cover plate 2 is arranged above the output transmission copper rod 8 and above the cavity 1, the upper cover plate 2 can move relative to the cavity 1, the upper cover plate 2 can be selectively opened according to usage requirements and usage conditions, the bottom end face of the upper cover plate 2 is fitted with the top end face of the cavity 1, the top end face of the upper cover plate 2 is provided with an annularly distributed cover plate fixing screws 3, the annularly distributed cover plate fixing screws 3 can make the upper cover plate 2 fit with the cavity 1, the top end face of the upper cover plate 2 is connected to an input connector 5 on the left side, the input connector 5 can be fixedly connected to an external device, and the specified frequency after filtering can be input through the fixed connection with the external device The input connector 5 and the output connector 6 are on the same horizontal line and are symmetrically distributed. The two are the input and output ends of the equipment. A tuning screw 4 is arranged on the right side of the input connector 5. The tuning screw 4 can rotate relative to the upper cover plate 2. The top end face of the tuning screw 4 is arranged flush with the top end face of the cover plate fixing screw 3 to avoid occupying additional operating space. The bottom end face of the tuning screw 4 is arranged in contact with the inner surface of the resonator 10. The number of the tuning screws 4 and the resonator 10 is matched. The two are matched. A cover plate fixing screw 3 is arranged on the right side of the tuning screw 4. The output connector 6 is arranged on the right side of the cover plate fixing screw 3. The output connector 6 can transmit the frequency filtered out from the inside to the specified position.

[0028] The working principle and use process of the present invention: After the present invention is installed, first place the device at the position where it needs to be used, then the external frequency input device can be fixedly connected to the input connector 5, and then the external frequency receiving device can be fixedly connected to the output connector 6, and then after the transmission frequency of the external frequency input device reaches the inner side of the left connecting rib 11 through the input connector 5, the coupling point of the frequency is tuned through the five resonators 10 to make the specified frequency absorbed, and then the filtered frequency is transmitted to the external specified device through the output transmission copper rod 8 and the output connector 6, and then when the specified index of the device needs to be adjusted, the The cover fixing screws 3 are separated from the annular limiting grooves on the top end face of the cavity 1, and then the cavity 1 is separated from the upper cover 2. It can then be changed to capacitance or inductance as required to meet the different frequency filtering needs of the user. At the same time, the intensity can be adjusted by tuning the coupling point of the resonator 10 for frequency adjustment. After the adjustment, the bottom end face of the upper cover 2 can be fitted with the top end face of the cavity 1, and then fixed in position by the cover fixing screws 3, and then the external frequency input device is fixedly connected to the input connector 5, and then the external frequency receiving device is fixedly connected to the output connector 6 to start working.

[0029] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A zero cavity filter, comprising a cavity (1) and a left connecting rib (11), characterized in that: A left connecting rib (11) is connected to the rear position of the inner surface of the cavity (1), an input transmission copper rod (7) is arranged on the right side of the left connecting rib (11), a resonator (10) is arranged on the right side of the input transmission copper rod (7), a coupling rib (9) is arranged behind the resonator (10), a right connecting rib (12) is arranged on the right side of the coupling rib (9), an output transmission copper rod (8) is connected to the left end face of the right connecting rib (12), an upper cover plate (2) is arranged above the output transmission copper rod (8) at the top of the cavity (1), an input connector (5) is connected to the left side of the top end face of the upper cover plate (2), a tuning screw (4) is arranged on the right side of the input connector (5), and a cover is arranged on the right side of the tuning screw (4). The cover plate fixing screw (3) is provided with an output connector (6) on the right side of the cover plate fixing screw (3); the bottom end surface of the tuning screw (4) is arranged to fit the inner surface of the resonator (10); the number of the tuning screw (4) and the resonator (10) is arranged to match; the input connector (5) can be fixedly connected to an external device; the input connector (5) and the output connector (6) are located at the same horizontal line and are symmetrically distributed; the input transmission copper rod (7) and the output transmission copper rod (8) can be electrically connected to the input connector (5) and the output connector (6) respectively; the top end surface of the coupling rib (9) is sunken by one millimeter compared to the top end surface of the cavity (1); and five resonators (10) are arranged and the size specifications of the five resonators (10) are consistent.

2. The zero cavity filter according to claim 1, characterized in that: The top end surface of the cavity (1) is provided with annularly distributed limiting grooves and the inner threads can engage with the threads on the outer bolt surface, and the upper cover plate (2) can move relative to the cavity (1).

3. The zero cavity filter according to claim 1, characterized in that: The bottom end surface of the upper cover plate (2) is arranged to fit the top end surface of the cavity (1), and the top end surface of the upper cover plate (2) is provided with cover plate fixing screws (3) distributed in an annular manner.

4. The zero cavity filter according to claim 1, characterized in that: The tuning screw (4) can rotate relative to the upper cover plate (2), and the top end surface of the tuning screw (4) and the top end surface of the cover plate fixing screw (3) are arranged to be flush with each other.

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