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Manufacturing Process for Tunable Cavity Filters

A manufacturing process and filter technology, applied in the field of reciprocal microwave devices, to achieve the effects of steep frequency characteristics, good temperature characteristics, and high Q value

Active Publication Date: 2016-09-28
江苏灿勤科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional cavity filters or dielectric cavity filters use aluminum materials such as AL6061 as the material of the cavity, which makes the realization of the dielectric cavity filter, due to the fact that aluminum is used as a metal part and a dielectric material There are serious reliability problems when soldering resonators

Method used

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  • Manufacturing Process for Tunable Cavity Filters
  • Manufacturing Process for Tunable Cavity Filters
  • Manufacturing Process for Tunable Cavity Filters

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Experimental program
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Embodiment 1~3

[0034] Embodiments 1 to 3: A manufacturing process for a tunable cavity filter, including a cavity 1 and a dielectric resonator 2, the dielectric resonator being a cylinder 4 with a through hole 3; the dielectric resonator 2 The composition of the following components by mass percentage is shown in Table 1:

[0035] Table 1

[0036]

[0037] One end of the dielectric resonator 2 is plated with a silver layer 5, and the other end of the dielectric resonator 2 is welded into the cavity 1;

[0038] The cavity 1 consists of the following components by mass percentage as shown in Table 2:

[0039] Table 2

[0040]

[0041] The relative dielectric constant of the cavity 1 is 9.5.

[0042] The above-mentioned dielectric resonator 2 is composed of the following components by mass percentage:

[0043] 30.5% calcium carbonate with a purity of 97.5%,

[0044] Alumina with a purity of 97.5% 10%,

[0045] 23% neodymium oxide with a purity of 99.5%,

[0046] 36.5% titanium dioxide with a purity of 99.6%....

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Abstract

The invention discloses a manufacturing process for an adjustable cavity filter, comprising the following steps: step 1, adding 95-96% of aluminum oxide, 2-3% of calcium carbonate, 0.8-1.5% of lanthanum oxide, and 0.2-3% of samarium oxide Mix 0.5% uniformly to obtain mixed powder; step 2, spray and granulate the mixed powder and form it into a green body with a density of 2.25~2.32g / cm³ by hydraulic press; step 3, heat up to 800°C at a rate of 110°C / h, and then Heat up to 1350°C at a rate of 300°C / h, keep warm for 1.5 hours, then lower the temperature to 1000°C at a rate of 200°C / h, then cool down to 500°C at a rate of 700~730°C / h, and then cool to normal; step 4. The inner wall of the cavity is covered with a metal layer, and the relative dielectric constant of the cavity is 9.5. The adjustable cavity filter obtained by the manufacturing process of the present invention has high Q value, small volume, adjustable temperature coefficient, high reliability of product structure, wide tuning range, good temperature characteristics, small volume and high reliability.

Description

Technical field [0001] The invention relates to a manufacturing process for an adjustable cavity filter, belonging to the field of reciprocal microwave devices. Background technique [0002] In the base station where the communication system completes the signal transmission and reception, the filter is used to select the communication signal and filter out the clutter or interference signal outside the frequency of the communication signal. At present, in mobile communication base station systems, cavity filters are commonly used to select frequencies for signals transmitted and received by antennas. Traditional cavity filters or dielectric cavity filters use aluminum materials such as AL6061 as the material of the cavity. This makes the realization of the dielectric cavity filter, because aluminum is used as metal parts and dielectric materials. There are serious reliability problems when welding the resonator. Therefore, how to design a high Q value dielectric filter with hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P11/00
Inventor 朱田中
Owner 江苏灿勤科技股份有限公司
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