Coaxial low-pass filter

A low-pass filter, coaxial technology, applied in the field of communication, can solve the problems of inability to increase the high-frequency suppression performance of the transmission zero point, unfavorable miniaturization design of the whole machine, limited suppression performance, etc.

Pending Publication Date: 2022-03-04
MOBILE ANTENNA TECH SHENZHEN +5
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AI Technical Summary

Problems solved by technology

[0005] The frequency response curve of the existing coaxial low-pass filter above the cut-off frequency is relatively smooth, and it is impossible to increase the transmission zero point to improve the high-frequency rejection performance
If the high-order harmonics of the system are close to the low-pass cut-off frequency, the low-pass suppression performance is limited, and the suppression performance can only be improved by increasing the low-pass order or the difference between high and low step impedances, which will result in the length of the low-pass Or the volume increases, which is not conducive to the miniaturization design of the whole machine
[0006] In summary, the existing structure obviously has inconvenience and defects in actual use, so it is necessary to improve it

Method used

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0031] see Figure 2 to Figure 9 In the first embodiment of the present invention, a coaxial low-pass filter 100 is provided, including a coaxial inner core 10, the coaxial inner core 10 includes low-impedance sections 11 connected in series with thick and thin intersecting intervals and high-impedance Section 12, at least one high-impedance section 12 is set as a winding inductance 20, and the low-impedance section 11 on the adjacent two sides of the winding inductance 20 is provided with a blind slot 13, and the two ends of the winding inductance 20 are respectively connected to two 13 blind slo...

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Abstract

The invention is suitable for the technical field of communication, and provides a coaxial low-pass filter which comprises a coaxial inner core, the coaxial inner core comprises a low-impedance section and a high-impedance section which are connected in series in a thick and thin crossed and spaced mode, and at least one high-impedance section is arranged to be a winding inductor. Blind grooves are formed in the low-impedance sections on the two adjacent sides of the winding inductor, and the two ends of the winding inductor are connected to the two blind grooves respectively. Therefore, at least one transmission zero point can be formed above the cut-off frequency of the coaxial low-pass filter, the high-frequency suppression performance is improved, and the total length of the coaxial low-pass filter can be reduced.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a coaxial low-pass filter. Background technique [0002] With the rapid development of wireless communication technology, the radio frequency spectrum resources are increasingly tight, and higher requirements are put forward for the high-frequency harmonic suppression performance of the communication base station duplexer. The current common practice is to use low-pass filters to suppress unnecessary High-frequency components, reducing the impact of high-frequency signals on the system itself and the surrounding electromagnetic environment. [0003] The coaxial impedance step low-pass filter is commonly known as the "sugar gourd string" low-pass filter. It adopts the metal coaxial inner core and coaxial outer wall in cascaded alternate thickness to realize the equivalent parallel capacitance and series inductance respectively. Because of its It is widely used due to the ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/202
CPCH01P1/202
Inventor 刘磊
Owner MOBILE ANTENNA TECH SHENZHEN
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