A Dielectrically Loaded Resonator

Abstract

The invention discloses a medium-loaded resonator, which includes a cover plate, a tuning screw, a loading medium, a metal resonant rod and a metal cavity, the metal resonant rod is fixed on the bottom of the metal cavity, the tuning screw is installed on the cover plate, and the cover plate is located on the metal resonator On the top of the cavity, a cylindrical positioning seat made of non-conductive material with a ring of bosses along the circumferential direction of the outer surface is provided between the metal resonant rod and the loading medium; the loading medium is cylindrical microwave ceramics, and the positioning seat The loading medium and the metal resonant rod are positioned and fixed; the metal resonant rod is equipped with an elastic metal disc, and the upper and lower end surfaces of the loading medium are in close contact with the cover plate and the metal disc respectively. Since the present invention adopts the positioning seat to position and fix the loading medium and the metal resonator, the structure of the loading medium is simplified into a cylindrical loading medium without side walls, which effectively improves the product pass-through rate, and at the same time greatly improves the production efficiency. Improve the market competitiveness of products.

Description

technical field [0001] The invention relates to a passive antenna feeder device in the field of wireless network communication, in particular to a medium-loaded resonator. Background technique [0002] For a long time, filters have played an extremely important role in the processing of electronic signals. It has the function of filtering signals of used frequencies and suppressing interference signals. With the rapid development of microwave wireless communication, miniaturized base stations have become the mainstream, and more and more stringent requirements have been placed on the volume of filters. Traditional metal coaxial resonator filters can no longer meet these requirements, so we want to use metal The open-circuit end of the coaxial resonator is loaded with high dielectric constant microwave ceramics, and the loading capacitance is increased to improve the performance of the filter while reducing its volume. [0003] There are various practical difficulties in the...

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Problems solved by technology

[0004] 1. In order to accurately position the loading medium on the metal resonator rod, the bottom of the ring-shaped loading medium needs to be recessed to form a very thin side wall. However, this thin wall is easy to crack during the production process of green body pressing and ceramic sintering. The product scrap rate has increased significantly

[0005] 2. Both ends of the loading medium need to be metallized, usually both ends are covered with silver, and the most economical and effective way to be silvered is screen printing. Because the bottom is uneven, this process cannot be used, and only other methods such as spraying can be used for production, resulting in Reduced production efficiency and consequently increased costs

[0006] 3. The no-load Q value of the medium-loaded resonator is very sensitive to conductive materials. Whether it is supported and positioned by wrapping the metal resonator rod from the periphery of the loaded medium or going deep into its inner hole, it will make the medium-loaded resonator unaffected. The load Q value is greatly reduced

[0007] Therefore, existing dielectrically loaded resonators cannot be promoted on products

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