LTCC filtering Balun based on resonator coupling

Abstract

The invention discloses an LTCC filtering Balun based on resonator coupling. The LTCC filtering Balun comprises a semi-wave-length resonator, two quarter-wave-length resonators, three feeders and four floors, wherein the semi-wave-length resonator, the two quarter-wave-length resonators, the three feeders and the four floors are distributed on eleven conductor layers and connected through metallization through holes. One input port and two output ports are formed in the three feeders respectively; the semi-wave-length resonator is respectively coupled with the two quarter-wave-length resonators, the three resonators are coupled with the three feeders respectively to form two filtering networks, and the filtering characteristic is achieved. In addition, the 180-degree phase difference of the two output ports is achieved through the characteristic of constant-amplitude opposition of two open ends of the semi-wave-length resonator. The LTCC technology adopted in the LTCC filtering Balun comprises a plurality of layers of structures, the size of a filter is reduced, and the LTCC filtering Balun has novelty, creativeness and practicability.

Description

technical field [0001] The invention relates to a filter balun circuit applicable to radio frequency front-end circuits, in particular to an LTCC filter balun based on resonator coupling. Background technique [0002] With the continuous upgrading of modern communication systems, the rapid development of wireless communication technology puts forward stricter requirements for RF front-end circuit components. High performance, miniaturization, and low cost have become important indicators for evaluating components today. [0003] Balun is an indispensable RF front-end device, which is widely used in balanced and unbalanced conversion in mixing, amplification and other circuits. In many circuit applications, the balun needs to be connected with a filter to filter the signal, which will inevitably increase the cost, volume and complexity of the circuit, so in order to reduce the cost and size of the communication system, the balun and filter It is necessary to integrate the pe...

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Problems solved by technology

[0004] In order to obtain the filter balun described in the above method, various techniques have been used to make circuits, such as waveguides, cavities, printed circuit boards, etc. Although the performance of the filter balun can be guaranteed, the structure is complex The resulting radio frequency device is often relatively large in size, which is not conducive to the widespread use in practice

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