Topological structure of quadplexer

Abstract

The invention provides a topological structure of a quadplexer. The topological structure comprises a first topological structure and a second topological structure, wherein the first topological structure comprises a first bridge, a second phase shift element, a third phase shift element, a first duplexer and a third duplexer; and the second topological structure comprises a fourth bridge, a fifth phase shift element, a sixth phase shift element, a second duplexer and a fourth duplexer. By the adoption of the technical scheme, the isolation degree of a transmitting end and a receiving end isindependent of the isolation degree of the duplexer and only depends on the phase unbalance degree of the bridge and the phase shift elements, so that the isolation degree and the power capacity can be improved at the same time, the isolation degree can be improved by about 20 dB, and the power capacity can be improved by about one time. The method is expected to be widely applied to a future 5G small base station system.

Description

technical field [0001] The invention relates to the technical field of bulk acoustic wave filters, in particular to a topology of a quadruplexer. Background technique [0002] With the development of wireless communication technology, people have higher and higher requirements for data transmission rate. Corresponding to the data transmission rate is the high utilization rate of spectrum resources and the complexity of spectrum. The complexity of the communication protocol puts forward strict requirements on the performance of each module of the RF system. In the RF front-end module, the RF filter plays a vital role. It can filter out out-of-band interference and noise to meet the requirements of the RF system and The requirements of the communication protocol for the signal-to-noise ratio improve communication quality and user experience. At the same time, in addition to the high requirements on the filter performance, the system also puts forward high requirements on the ...

AI Technical Summary

Problems solved by technology

[0003] In the future 5G communication, the small base station system will become an important part. The small base station system will adopt a higher transmission frequency. Due to the space attenuation, the power of the transmitted signal will inevitably be increased. In order to improve the sensitivity of the receiver, it is necessary to Higher requirements are put forward for the isolation of transceivers, so the future small base station system will inevitably require smaller filters and multiplexers, higher power capacity, higher isolation, and lower cost. At present, the main use of base station systems is cavity Filters, cavity multiplexers, filters and multiplexers with cavity structures have small insertion loss, good out-of-band suppression, and high isolation, but one of their significant disadvantages is that they are large in size and high in processing costs, making it difficult It has been widely used in 5G communications, and bulk acoustic wave filters and multiplexers are characterized by good insertion loss, high out-of-band rejection, and low cost, but a significant disadvantage is that their power capacity is poor, and the current power capacity is only 1.5W It is difficult to adapt to the requirements of future 5G communication

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