WO2016106707A1 - 调谐螺杆及其制造方法、腔体滤波器、通信设备 - Google Patents
调谐螺杆及其制造方法、腔体滤波器、通信设备 Download PDFInfo
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- WO2016106707A1 WO2016106707A1 PCT/CN2014/095960 CN2014095960W WO2016106707A1 WO 2016106707 A1 WO2016106707 A1 WO 2016106707A1 CN 2014095960 W CN2014095960 W CN 2014095960W WO 2016106707 A1 WO2016106707 A1 WO 2016106707A1
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- Prior art keywords
- tuning
- screw
- segment
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- cavity filter
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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
- H01P1/207—Hollow waveguide filters
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a tuning screw and a method of manufacturing the same, and to a cavity filter and a communication device.
- the concept of intermodulation refers to the signal of a new frequency generated by superimposing two different frequency signals in a certain system.
- Passive intermodulation is mainly generated by passive nonlinear devices (such as cables, connectors, filters, etc.), and passive nonlinear intermodulation is usually generated for two reasons: one is nonlinearity caused by metal contact, and the other is nonlinear One is the inherent nonlinearity of the material itself.
- the first category is the main reason for the intermodulation, and it is more difficult to solve.
- This program mainly solves the first type of intermodulation caused by poor metal contact.
- Intermodulation is an indicator of the filter product.
- the main method of the inventor's test is to apply two equal-frequency signals of different frequencies in the transmission band of the filter, and observe the influence of the intermodulation signal falling in the receiving frequency band on the received signal.
- the intermodulation signal is below a certain reference value.
- intermodulation is basically used as an indicator to measure the nonlinearity of the device. Because the intermodulation signal generated by it is easy to fall into the working passband and affect the normal operation of the system, a new design solution is needed to solve this problem. Tricky problem.
- the nonlinearity caused by metal contact mainly includes the following reasons:
- the tuning screw is not securely locked
- the combination of the tuning screw and the cover of the cavity filter is not stable, and is not fully contacted by 360 degrees.
- the input port of the product needs to feed a large amount of power. Due to the limited locking torque of the cavity filter, it is impossible to ensure that the combination of the cover plate and the screw joint surface is very stable, and it is easy to produce non-360 degree full contact. This poorly connected structure produces a strong intermodulation signal.
- FIG. 1 is a simplified schematic diagram of a cavity filter in the prior art.
- the cavity filter 100 includes a cavity 110, a cover 120, a resonance tube 130, and a tuning screw 140.
- the total thickness of the existing cover plate 120 is only 3 mm, and the current density of the bonding portion between the tuning screw 140 and the inner surface of the cover plate 120 is very large, and since the thread is always spiral, The last half turn of the inner surface of the cover plate 120 always has an end, and this last half turn of the thread does not fit well with the cover 120. As a result, a strong intermodulation source is formed between the tuning screw 140 and the surface of the cover plate 120, and the intermodulation straight-through rate of the product is very poor.
- the invention provides a tuning screw and a manufacturing method thereof, a cavity filter and a communication device, so as to solve the problem that the tuning screw generates a strong intermodulation signal falling into the working passband and affects the normal operation of the system.
- a technical solution adopted by the present invention is to provide a tuning screw, including:
- a tuning section coupled to the first end of the screw segment
- the outer surface of the tuning segment has an insulating layer.
- the insulating layer is a polytetrafluoroethylene layer, and the polytetrafluoroethylene layer is composited on an outer surface of the tuning segment.
- the insulating layer is an insulating sleeve, and the insulating sleeve is sleeved on an outer surface of the tuning segment.
- the outer surface of the tuning segment has a smooth wall.
- the outer end of the tuning segment is in the shape of a ball.
- the second end of the screw segment is provided with a spiral fitting structure, and the spiral fitting structure is a concave inner six-flower, a groove or a cross groove.
- the polytetrafluoroethylene layer has a thickness of from 0.2 to 0.25 mm.
- a cavity filter including:
- a cover plate covering the cavity to form a resonant cavity
- the tuning screw comprises a screw segment and a tuning segment connected to the first end of the screw segment, the screw segment is locked with the cover plate, and an outer surface of the tuning segment has an insulating layer, the insulation The layer serves to reduce the current density at the junction of the tuning screw and the cover.
- another technical solution adopted by the present invention is to provide a communication device, including the cavity filter according to the above claim, wherein the cavity filter is disposed in a signal transmitting and receiving circuit portion of the communication device. Used to select a signal.
- another technical solution adopted by the present invention is to provide a method for manufacturing a tuning screw, comprising the following steps:
- An insulating layer is disposed on an outer surface of the tuning segment.
- the step of machining a section of the metal bar into the tuning segment comprises:
- the outer end of the tuning segment is machined into a ball-like shape with smooth walls.
- the step of machining a section of the metal bar out of the screw segment comprises:
- the second end of the screw segment is machined into a spiral mating structure, which is a concave inner six-flower, a groove or a cross recess.
- the step of providing an insulating layer on an outer surface of the tuning segment comprises:
- An insulating sleeve is placed on the outer surface of the tuning segment.
- the method before the step of spraying the outer surface of the tuning segment with the polytetrafluoroethylene, the method further comprises:
- the outer surface of the screw segment is shielded, wherein the shielding surface is spaced from the insulating layer by one or two turns of thread.
- the tuning screw provided by the present invention can reduce the field strength on the tuning screw and reduce the current of the bonding portion between the tuning screw and the inner surface of the cover plate due to the provision of the insulating layer.
- Density in the case of ensuring the adjustment frequency, can greatly reduce the influence of the tuning screw on the intermodulation, improve the intermodulation straight-through rate of mass-produced products, reduce the maintenance cost of the product, and improve the performance of the entire product.
- FIG. 1 is a simplified schematic diagram of a cavity filter in the prior art
- FIG. 2 is a simplified schematic view of a tuning screw of a preferred embodiment of the present invention.
- FIG. 3 is a simplified flow diagram of a method of manufacturing a tuning screw in accordance with a preferred embodiment of the present invention.
- FIG. 2 is a simplified schematic structural view of a tuning screw according to a preferred embodiment of the present invention.
- the present invention provides a tuning screw 200 that includes a screw segment 210 and a tuning segment 220.
- the screw segment 210 includes a first end 211 and a second end 212.
- the second end 212 of the screw segment 210 is provided with a spiral fitting structure 214, and the spiral fitting structure 214 is a concave inner six-flower, a groove or a cross groove.
- the tuning section 220 is coupled to the first end 211 of the screw segment 210.
- the outer surface of the tuning section 220 has a smooth wall.
- the outer end of the tuning section 220 is in the shape of a ball, and the outer surface of the tuning section 220 has an insulating layer 222.
- the insulating layer 222 is a polytetrafluoroethylene layer (PTFE), and the polytetrafluoroethylene layer can be composited on the outer surface of the tuning section 220 by spraying.
- PTFE polytetrafluoroethylene layer
- the thickness of the polytetrafluoroethylene layer sprayed is preferably 0.2-0.25 mm, and by changing the thickness of the spray, the current density of the bonding surface of the inner surface of the tuning screw 210 and the cover plate (refer to FIG. 1) can be directly changed, thereby reducing the tuning.
- the insulating layer 222 can also be an insulating sleeve that is disposed on the outer surface of the tuning segment 220.
- the present invention also provides a cavity filter including a cavity, a cover plate, a resonance tube, and the above-described tuning screw 200.
- the cover cap covers the cavity to form a resonant cavity, and the resonant tube is disposed in the resonant cavity;
- the tuning screw 200 is inserted into the resonant tube through the cover plate, and the tuning screw 200 includes the screw segment 210 and the first portion connected to the screw segment 210
- One end of the tuning section 220, the screw section 210 is locked with the cover plate, and the outer surface of the tuning section 220 has an insulating layer 222 for reducing the current density at the junction of the tuning screw 200 and the cover plate.
- the specific structure and formation manner of the tuning screw 200 refer to the context, and details are not described herein again.
- the present invention also provides a communication device comprising the above-described cavity filter, the cavity filter being provided in a signal transceiving circuit portion of the communication device for selecting a signal.
- FIG. 3 is a simplified flow chart of a method of manufacturing a tuning screw in accordance with a preferred embodiment of the present invention.
- the present invention also provides a manufacturing method of the tuning screw 200, comprising the following steps:
- the method further includes the step of machining the second end 212 of the screw segment 210 into the spiral fitting structure 214, wherein the spiral fitting structure 214 is a concave inner six-flower, a groove or a cross groove.
- a section of the metal bar is machined out of the tuning section 220, wherein the tuning section 220 is located at the first end 211 of the screw section 210.
- the method further includes the step of processing the outer end of the tuning section 220 into a ball-shaped shape having a smooth wall.
- An insulating layer 222 is disposed on the outer surface of the tuning section 220.
- the method further includes the steps of: spraying the outer surface of the tuning section 220 with Teflon; or providing the insulating sleeve on the outer surface of the tuning section 220.
- the step of spraying the outer surface of the tuning section 220 before the step of spraying the polytetrafluoroethylene further includes the step of shielding the outer surface of the screw segment 210, wherein the shielding layer insulating layer 222 is spaced apart by one or two turns of the thread.
- the tuning screw 200 provided by the present invention can reduce the field strength on the tuning screw 200 by reducing the field strength on the tuning screw 200 and reduce the bonding position between the tuning screw 200 and the inner surface of the cover plate.
- the current density can greatly reduce the influence of the tuning screw 200 on the intermodulation while ensuring the adjustment frequency, improve the intermodulation straight-through rate of the mass-produced products, reduce the maintenance cost of the product, and improve the performance of the entire product.
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Abstract
本发明提供一种调谐螺杆及其制造方法、腔体滤波器、通信设备，该调谐螺杆包括螺杆段及调谐段，调谐段连接于螺杆段的第一端；调谐段上的外表面具有绝缘层。本发明提供的调谐螺杆由于设置有绝缘层，可减小调谐螺杆上的场强，减小调谐螺杆与盖板内表面结合部位的电流密度，在保证调节频率的情况下可大幅降低调谐螺杆对互调的影响，提高大批量生产产品的互调直通率，降低产品维修成本，提升了整个产品的性能。
Description
【技术领域】
本发明涉及通信技术领域，特别涉及一种调谐螺杆及其制造方法，还涉及一种腔体滤波器、通信设备。
【背景技术】
互调的概念是指两个不同频率信号，在某一系统内叠加而产生的新的频率的信号。
当这种信号落在接收频带内，将影响电信设备的正常接收。当该系统为无源系统时，称为无源非线性互调。
无源互调主要由无源非线性器件产生（如电缆、连接器、滤波器等），而无源非线性互调的产生通常有两种原因：一类是金属接触引起的非线性，另一类是材料本身的固有非线性。
其中，第一类是产生互调的主要原因，且比较难解决。本方案主要解决第一类因金属接触不良引起的互调。
互调是滤波器产品的指标，发明人测试的主要方法是在滤波器发射频段内施加两个不同频率的等幅信号，观察其落入接收频段的互调信号对接收信号的影响，一般要求该互调信号低于某一参考值。
因此，现在基本上用互调作为衡量器件非线性的指标，又因其产生的互调信号很容易落入工作通带内，影响系统正常工作，所以需要采用一种全新的设计方案来解决此棘手问题。
在无源腔体滤波器中，由金属接触引起的非线性主要包括以下原因：
1、调谐螺杆锁合不牢固；
2、调谐螺杆与腔体滤波器的盖板的结合面结合不稳固，非360度全接触。
在测试互调时，产品的输入口需要馈入很大的功率，由于腔体滤波器的调试螺杆锁合力矩有限，无法保证盖板与螺杆结合面结合很稳固，容易产生非360度全接触，这种接触不良结构会产生很强的互调信号。
请参阅图1，图1是现有技术中一种腔体滤波器的简化结构示意图。
如图1所示，腔体滤波器100包括腔体110、盖板120、谐振管130以及调谐螺杆140。
由于盖板110与调谐螺杆140通过螺纹有效结合，现有盖板120的总厚度只有3mm，调谐螺杆140与盖板120内表面结合部位的电流密度非常大，又因螺纹总是螺旋状，在盖板120内表面最后半圈螺纹总有末端，这最后的半圈螺纹不能很好的与盖板120紧密结合。导致调谐螺杆140与盖板120面结合部位形成很强的互调源，产品的互调直通率很差。
【发明内容】
本发明提供一种调谐螺杆及其制造方法、腔体滤波器、通信设备，以解决现有技术中调谐螺杆会产生很强的互调信号落入工作通带内，影响系统正常工作的问题。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种调谐螺杆，包括：
螺杆段；
调谐段，连接于所述螺杆段的第一端；
其中，所述调谐段的外表面具有绝缘层。
根据本发明一优选实施例，所述绝缘层为聚四氟乙烯层，所述聚四氟乙烯层复合在所述调谐段的外表面。
根据本发明一优选实施例，所述绝缘层为绝缘套，所述绝缘套套设在所述调谐段的外表面。
根据本发明一优选实施例，所述调谐段的外表面具有光滑壁。
根据本发明一优选实施例，所述调谐段的外端呈球头状。
根据本发明一优选实施例，所述螺杆段的第二端设有螺旋配合结构，所述螺旋配合结构为凹陷的内六花、一字凹槽或十字凹槽。
根据本发明一优选实施例，所述聚四氟乙烯层的厚度为0.2-0.25毫米。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种腔体滤波器，包括：
腔体；
盖板，封盖所述腔体以形成谐振腔；
调谐螺杆，穿过所述盖板插置于所述谐振腔；
其中，所述调谐螺杆包括螺杆段和连接于所述螺杆段的第一端的调谐段，所述螺杆段与所述盖板锁合，所述调谐段的外表面具有绝缘层，所述绝缘层用于降低所述调谐螺杆与所述盖板结合处的电流密度。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种通信设备，包括权利要求上述的腔体滤波器，所述腔体滤波器设于所述通信设备的信号收发电路部分，用于对信号进行选择。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种调谐螺杆的制作方法，包括以下步骤：
将金属棒料的一段加工出螺杆段；
将金属棒料的一段加工出调谐段，其中，所述调谐段位于所述螺杆段的第一端；
在所述调谐段的外表面设置绝缘层。
根据本发明一优选实施例，所述将金属棒料的一段加工出调谐段的步骤包括：
将所述调谐段的外端加工呈具有光滑壁的球头状。
根据本发明一优选实施例，所述将金属棒料的一段加工出螺杆段的步骤包括：
将所述螺杆段的第二端加工出螺旋配合结构，所述螺旋配合结构为凹陷的内六花、一字凹槽或十字凹槽。
根据本发明一优选实施例，所述在所述调谐段的外表面设置绝缘层的步骤包括：
在所述调谐段的外表面喷涂聚四氟乙烯；或者
将绝缘套套设在所述调谐段的外表面。
根据本发明一优选实施例，所述在所述调谐段的外表面喷涂聚四氟乙烯的步骤之前还包括：
对所述螺杆段的外表面进行遮蔽，其中，所述遮蔽面与所述绝缘层间隔一到两圈螺纹。
本发明的有益效果是：区别于现有技术的情况，本发明提供的调谐螺杆由于设置有绝缘层，可减小调谐螺杆上的场强，减小调谐螺杆与盖板内表面结合部位的电流密度，在保证调节频率的情况下可大幅降低调谐螺杆对互调的影响，提高大批量生产产品的互调直通率，降低产品维修成本，提升了整个产品的性能。
【附图说明】
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图，其中：
图1是现有技术中一种腔体滤波器的简化结构示意图；
图2是本发明优选实施例的调谐螺杆的简化结构示意图；
图3是本发明优选实施例的调谐螺杆制造方法的简化流程图。
【具体实施方式】
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图2，图2是本发明优选实施例的调谐螺杆的简化结构示意图。
如图2所示，本发明提供一种调谐螺杆200，该调谐螺杆200包括螺杆段210和调谐段220。
螺杆段210包括第一端211和第二端212，螺杆段210的第二端212设有螺旋配合结构214，螺旋配合结构214为凹陷的内六花、一字凹槽或十字凹槽等。
调谐段220连接于螺杆段210的第一端211，调谐段220的外表面具有光滑壁，优选地，调谐段220的外端呈球头状，调谐段220的外表面具有绝缘层222。
在优选实施例中，该绝缘层222为聚四氟乙烯层（PTFE，Polytetrafluoroethylene），聚四氟乙烯层可通过喷涂方式复合在调谐段220的外表面。
其中，聚四氟乙烯层喷涂的厚度优选为0.2-0.25毫米，通过改变喷涂的厚度，可以直接改变调谐螺杆210与盖板（可参考图1）内表面结合部位的电流密度，从而降低因调谐螺杆210与盖板接触不良产生的互调信号电平。
在其他实施例中，绝缘层222也可为绝缘套，绝缘套套设在调谐段220的外表面。
本发明还提供一种腔体滤波器，腔体滤波器包括腔体、盖板、谐振管以及上述的调谐螺杆200。
其中，盖板封盖腔体以形成谐振腔，谐振管设于谐振腔内；调谐螺杆200穿过盖板插置于谐振管，调谐螺杆200包括螺杆段210和和连接于螺杆段210的第一端调谐段220，螺杆段210与盖板锁合，调谐段220的外表面具有绝缘层222，绝缘层222用于降低调谐螺杆200与盖板结合处的电流密度。调谐螺杆200的具体结构和形成方式参考上下文，此处不再赘述。
本发明还提供一种通信设备，该通信设备包括上述的腔体滤波器，腔体滤波器设于通信设备的信号收发电路部分，用于对信号进行选择。
请一并参阅图2和图3，其中，图3是本发明优选实施例的调谐螺杆制造方法的简化流程图。
如图3所示，本发明还提供一种调谐螺杆200的制作方法，包括以下步骤：
S1：将金属棒料的一段加工出螺杆段210。
在本步骤中，进一步包括步骤：将螺杆段210的第二端212加工出螺旋配合结构214，其中，螺旋配合结构214为凹陷的内六花、一字凹槽或十字凹槽等。
S2：将金属棒料的一段加工出调谐段220，其中，调谐段220位于螺杆段210的第一端211。
在本步骤中，进一步包括步骤：将调谐段220的外端加工呈具有光滑壁的球头状。
S3：在调谐段220的外表面设置绝缘层222。
在本步骤中，进一步包括步骤：在调谐段220的外表面喷涂聚四氟乙烯；或者将绝缘套套设在调谐段220的外表面。
其中，所述在调谐段220的外表面喷涂聚四氟乙烯的步骤之前还包括：在螺杆段210的外表面进于遮蔽的步骤，其中，遮蔽层面绝缘层222可间隔一到两圈螺纹。
综上所述，本领域技术人员容易理解，本发明提供的调谐螺杆200由于设置有绝缘层222，可减小调谐螺杆200上的场强，减小调谐螺杆200与盖板内表面结合部位的电流密度，在保证调节频率的情况下可大幅降低调谐螺杆200对互调的影响，提高大批量生产产品的互调直通率，降低产品维修成本，提升了整个产品的性能。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
Claims (20)
- 一种调谐螺杆，其特征在于，包括：螺杆段；调谐段，连接于所述螺杆段的第一端；其中，所述调谐段的外表面具有绝缘层。
- 根据权利要求1所述的调谐螺杆，其特征在于，所述绝缘层为聚四氟乙烯层，所述聚四氟乙烯层复合在所述调谐段的外表面。
- 根据权利要求1所述的调谐螺杆，其特征在于，所述绝缘层为绝缘套，所述绝缘套套设在所述调谐段的外表面。
- 根据权利要求1所述的调谐螺杆，其特征在于，所述调谐段的外表面具有光滑壁。
- 根据权利要求4所述的调谐螺杆，其特征在于，所述调谐段的外端呈球头状。
- 根据权利要求1所述的调谐螺杆，其特征在于，所述螺杆段的第二端设有螺旋配合结构，所述螺旋配合结构为凹陷的内六花、一字凹槽或十字凹槽。
- 根据权利要求2所述的调谐螺杆，其特征在于，所述聚四氟乙烯层的厚度为0.2-0.25毫米。
- 一种腔体滤波器，其特征在于，包括：腔体；盖板，封盖所述腔体以形成谐振腔；调谐螺杆，穿过所述盖板插置于所述谐振腔；其中，所述调谐螺杆包括螺杆段和连接于所述螺杆段的第一端的调谐段，所述螺杆段与所述盖板锁合，所述调谐段的外表面具有绝缘层，所述绝缘层用于降低所述调谐螺杆与所述盖板结合处的电流密度。
- 根据权利要求8所述的腔体滤波器，其特征在于，所述绝缘层为聚四氟乙烯层，所述聚四氟乙烯层复合在所述调谐段的外表面。
- 根据权利要求8所述的腔体滤波器，其特征在于，所述绝缘层为绝缘套，所述绝缘套套设在所述调谐段的外表面。
- 根据权利要求8所述的腔体滤波器，其特征在于，所述调谐段的外表面具有光滑壁。
- 根据权利要求11所述的腔体滤波器，其特征在于，所述调谐段的外端呈球头状。
- 根据权利要求8所述的腔体滤波器，其特征在于，所述螺杆段的第二端设有螺旋配合结构，所述螺旋配合结构为凹陷的内六花、一字凹槽或十字凹槽。
- 根据权利要求9所述的腔体滤波器，其特征在于，所述聚四氟乙烯层的厚度为0.2-0.25毫米。
- 一种通信设备，其特征在于，包括权利要求8-14中任一项所述的腔体滤波器，所述腔体滤波器设于所述通信设备的信号收发电路部分，用于对信号进行选择。
- 一种调谐螺杆的制作方法，其特征在于，包括以下步骤：将金属棒料的一段加工出螺杆段；将金属棒料的一段加工出调谐段，其中，所述调谐段位于所述螺杆段的第一端；在所述调谐段的外表面设置绝缘层。
- 根据权利要求16所述的调谐螺杆的制作方法，其特征在于，所述将金属棒料的一段加工出调谐段的步骤包括：将所述调谐段的外端加工呈具有光滑壁的球头状。
- 根据权利要求16所述的调谐螺杆的制作方法，其特征在于，所述将金属棒料的一段加工出螺杆段的步骤包括：将所述螺杆段的第二端加工出螺旋配合结构，所述螺旋配合结构为凹陷的内六花、一字凹槽或十字凹槽。
- 根据权利要求16所述的调谐螺杆的制作方法，其特征在于，所述在所述调谐段的外表面设置绝缘层的步骤包括：在所述调谐段的外表面喷涂聚四氟乙烯；或者将绝缘套套设在所述调谐段的外表面。
- 根据权利要求19所述的调谐螺杆的制作方法，其特征在于，所述在所述调谐段的外表面喷涂聚四氟乙烯的步骤之前还包括：对所述螺杆段的外表面进行遮蔽，其中，所述遮蔽面与所述绝缘层间隔一到两圈螺纹。
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