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LC filter with wide band, high rectangle coefficient and high suppression band-pass

An LC filter and rectangular coefficient technology, which is applied in the field of filters, can solve the problems of increased volume of cavity filters, difficult and complex product engineering applications, and difficult implementation, and achieves low standing wave and insertion loss, and takes into account performance and volume effect

Inactive Publication Date: 2017-06-13
北京中科飞鸿科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Generally speaking, it is not easy to realize a broadband high-rejection filter in the 1800MHz frequency band. Under the existing technology, it can only be realized with a cavity filter. In this frequency band, the volume of the cavity filter Larger, it is difficult to be used in engineering applications of complex products. With the increase of bandwidth, the size of the cavity filter also increases, and the realization is more difficult. Moreover, the existing cavity filter is at 1800MHz frequency The lower bandwidth can only achieve a bandwidth not greater than 800MHz
[0004] At present, if this frequency point reaches -0.5dB bandwidth ≥ 1000MHz and out-of-band rejection ≥ 35dBc at 1100MHz & ≥ 35dBc at 2500MHz, the corresponding LC filter has the following problems: If the Q value of the inductor is guaranteed, the volume is the smallest It can achieve 45.4mm*10mm*7mm; if it is reduced to the same volume, the parameters related to the Q value cannot be guaranteed

Method used

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  • LC filter with wide band, high rectangle coefficient and high suppression band-pass
  • LC filter with wide band, high rectangle coefficient and high suppression band-pass
  • LC filter with wide band, high rectangle coefficient and high suppression band-pass

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specific Embodiment approach

[0016] Broadband of the present invention, high rectangularity coefficient, high suppression band-pass LC filter, its preferred embodiment is:

[0017] It includes a filter cavity, a PCB board, a capacitor, an air-core coil, and an insulator. The PCB board is arranged in the cavity, and the outside of the air-core coil is covered with insulating varnish with a low dielectric constant. The capacitor and the The air-core coils are all fixed on the PCB by soldering;

[0018] The LC filter is an 8th-order LC filter structure. In the topology of the LC filter, there are 12 groups of LC resonant circuits composed of capacitors and air-core coils. Each group of LC resonant circuits is composed of a capacitor and an air-core coil. .

[0019] The back of the PCB board is completely grounded by soldering, directly connected to the cavity body, no solder mask is applied, and the back of the PCB board is in full contact with the base.

[0020] The high-frequency insulator is used to con...

specific Embodiment

[0037] like figure 1 As shown, it includes a shell 1, a capacitor 2, an air core coil 3, a PCB board 4 and an I / O pin 5, the PCB board is arranged on the shell 1, and the PCB board 2 is 0.8mm thick and 7.5mm wide. 43mm long, the air-core coil 3, the capacitor 2 and the air-core coil 3 are all fixed on the PCB by soldering; the two ends of the PCB board 2 are respectively connected to the high-frequency insulator through the air-core coil 3 , the shielding cover is fixed on the shell 1 by screws, the filter shell 1 and the shielding cover are made of brass, and the surface is silver-plated to increase the high-frequency conductivity of the shell; the hollow core The coil 3 has the advantages of stable magnetic inductance, small equivalent DC resistance, high Q value, small temperature drift and high stability.

[0038] The LC filter is an 8th-order LC filter, and the elliptical LC filter of the LC filter has 12 groups of resonant circuits composed of capacitors and air-core co...

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Abstract

The invention discloses an LC filter with a wide band, a high rectangle coefficient and a high suppression band-pass. The high suppression band-pass LC filter comprises a filter cavity, a printed circuit board, capacitors, hollow-core coils and an insulator, wherein the printed circuit board is arranged inside the cavity, the hollow-core coil is sleeved with an insulating varnish wrap of a low dielectric constant, and the capacitor and the hollow-core coil are fixed on the printed circuit board through tin soldering; the insulator is fixed inside the cavity, and one end of the insulator is welded on the printed circuit board; the LC filter is of an eight-order LC filter structure, and a topological structure of the LC filter is provided with 12 LC resonant circuit formed by the capacitors and the hollow-core coils, and each LC resonant circuit is formed by a capacitor and a hollow-core coil. The performance and the volume of the filter are taken into consideration, the LC filter has the advantages of small package, large bandwidth, low fluctuation and high stopband rejection, and meanwhile the standing wave and the insertion loss are small.

Description

technical field [0001] The invention relates to a filter, in particular to a band-pass LC filter with wide frequency band, high rectangular coefficient and high rejection. Background technique [0002] With the development of radio frequency technology, the requirements for the filter frequency index are becoming increasingly stringent. Some commonly used communication equipment transmit and receive channels need to use filters with higher square coefficient and higher rejection to meet the increasingly high clutter filtering requirements. , information transmission capacity and wide frequency bandwidth, but at the same time, the requirements for volume are becoming more and more stringent, and the volume must be developed towards "miniaturization". [0003] Generally speaking, it is not easy to realize a broadband high-rejection filter in the 1800MHz frequency band. Under the existing technology, it can only be realized with a cavity filter. In this frequency band, the volu...

Claims

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 杨丽伟左慧杰万飞靳超松
Owner 北京中科飞鸿科技股份有限公司
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