QJ-B14900-1000-N7A28 type cavity band-pass filter

Abstract

The invention discloses a QJ-B14900-1000-N7A28 type cavity band-pass filter. The boundary dimensions of the filter are 9 mm, 13 mm and 40 mm respectively, the tolerance is + / -0.1, the filter is made of H62 copper, and the surface of the filter is plated with silver. The working temperature of the filter is-40 DEG C to +70 DEG C, the storage temperature is-55 DEG C to +85 DEG C, the bearable temperature range is-55 DEG C to +85 DEG C, the conversion time is shorter than 5 min, the temperature impact is kept for 30 min, and circulation is performed for 5 times. The pass band frequency of the filter ranges from 14400 MHz to 15400 MHz, the insertion loss is smaller than or equal to 2 dB, the center insertion loss is smaller than or equal to 1.5 dB, and the out-of-band rejection is larger thanor equal to 35 dBc@13350 MHz and larger than or equal to52dBc@DC to 12500MHz, the in-band fluctuation is less than or equal to 0.5 dB,and the passband standing wave is less than or equal to 1.5: 1. The passband width of the filter is increased in a limited size as much as possible, so that a smaller in-band fluctuation requirement can be obtained, and the production and actual requirements are met. The problem brought by the method is to increase the passband width and reduce the suppression degree of suppression frequency points outside the passband, and the solution is to properly expand thebandwidth, so that sideband loss and sideband suppression meet the production and actual requirements, and the operation is simple.

Description

technical field [0001] The invention relates to the field of filters, in particular to a QJ-B14900-1000-N7A28 cavity bandpass filter. Background technique [0002] A filter is a filter circuit composed of capacitors, inductors and resistors. The filter can effectively filter the frequency point of a specific frequency in the power line or frequencies other than this frequency point to obtain a power signal of a specific frequency or eliminate a power signal of a specific frequency. A filter is a frequency-selective device that allows specific frequency components in a signal to pass while greatly attenuating other frequency components. Utilizing this frequency selection function of the filter, it is possible to filter out interference noise or perform spectrum analysis. [0003] In the prior art, the closer the frequency point to the sideband of the passband, the greater the insertion loss. How to deal with the fluctuation of the insertion loss at the center frequency poin...

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Problems solved by technology

[0003] In the prior art, the closer the frequency point to the sideband of the passband, the greater the insertion loss. How to deal with the fluctuation of the insertion loss at the center frequency point and the sideband frequency point in the passband is very important. If the design is not appropriate, it may Will cause the in-band fluctuation index to fail to meet

When designing, the technical indicators are complex and there are certain design risks

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