Multi-channel gyromagnetic filter magnetic circuit

Abstract

The invention discloses a multi-channel gyromagnetic filter magnetic circuit, and belongs to the technical field of magnetic device integration. The multi-channel gyromagnetic filter magnetic circuitcomprises a lower magnetic circuit (1), an upper magnetic circuit (2), magnetic pole columns (3) of the upper and lower magnetic circuits, a main coil (4), compensation coils (5), coil mounting grooves (6) and a multi-path resonance circuit (7), wherein the coil mounting grooves (6) are located in the end faces of the upper and lower magnetic pole columns (3) and are perpendicular to the end faces, the end faces of the magnetic pole columns (3) are equally divided into filter channel integration number n, the compensation coils (5) are sleeved with the coil mounting grooves (6), and the numberof the compensation coils (5) is not less than n-1. According to the invention, the magnetic circuit can achieve the frequency compensation capability of 0-200 MHz in the P-Ku waveband, the filter resonance circuit stage number is not limited, the applicability is wide, multi-channel integration of all gyromagnetic filters can be covered, power consumption of the device is reduced, the compensation frequency modulation range is controlled and the reliability is improved, and the manufacturing cost of the filter product is favorably controlled and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of magnetic device integration, in particular to a multi-channel gyromagnetic filter magnetic circuit. Background technique [0002] The basic structure of the gyromagnetic filter is composed of a resonant circuit and a magnetic circuit. The magnetic circuit adopts a self-shielding compact structure, and the magnetic poles of the upper and lower magnetic circuits form a working air gap. l g , the resonant circuit is placed in the working air gap l g Inside, the magnetic circuit coil passes through the current in the working air gap l g Generate a uniform magnetic field inside H e (A uniform and consistent magnetic field is the key to the consistent operating frequency of the resonators at all levels in the resonant circuit and to avoid the excitation of high-order magnetostatic modes). After the resonant circuit satisfies the resonant condition, the resonant frequency f 0 working air gap field H e...

AI Technical Summary

Problems solved by technology

[0005] 1) High manufacturing cost

[0006] The manufacturing precision of the magnetic circuit and the resonant circuit and the consistency control of the resonant circuit parameters are high in cost and low in production efficiency;

[0007] 2) The uniformity of the magnetic field of the air-core compensation coil is poor

[0008] The uniformity of the magnetic field generated in the air-core coil is poor, which is easy to excite the high-order magnetostatic mode of the resonant circuit, and affects the frequency consistency of the resonators at all levels. Therefore, the air-core compensation coil is only suitable for filters with few resonant stages;

[0009] 3) The hollow compensation coil frequency tuning compensation range is small

[0010] Limited by the air gap or the space of the resonant circuit, the compensation coil can be wound with fewer turns or can only use a small wire diameter, the tuning sensitivity of the compensation coil is low, and the current carrying capacity is small, resulting in a small frequency tuning compensation range of the compensation coil;

[0011] 4) Product power consumption increases

[0012] The FM coil has a certain thickness, no matter it is installed in the resonant circuit or bonded on the magnetic pole surface, the length of the working air gap should be increased l g , which reduces the tuning sensitivity of the main coil and increases the power consumption of the product

Images