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    5G base station filter changes

    In the 3/4G period, the base station is composed of three parts: the baseband processing unit BBU, the radio frequency processing unit RRU and the antenna feeder system. In the 5G era, the three components of the base station have undergone significant changes: (1) BBU is divided into CU-DU two-stage architecture (2) RRU and large-scale array antennas merge to form an active antenna AAU (3) some of the original BBU physical layer functions are placed in the AAU. The investment implications of these three changes, which we have described in detail in Series 4 and 5, will focus on the technological upgrade trend of filters as one of the key RF devices in the 5G era, as well as potential investment targets of concern.
    In the 3G/4G era, metal coaxial cavity filters are the mainstream choice in the market: base station filters are the key components of radio frequency systems, the main principle of which is to enable the transmission and reception of specific frequency components in the signal through, and greatly attenuate other frequency components. Conventional filters are usually implemented by metal coaxial cavities, in which different frequencies of electromagnetic waves oscillate in coaxial cavity filters, so that the resonant frequencies of the filters can be retained, while the remaining frequencies of electromagnetic waves dissipate in the oscillation. In the 3G / 4G era, the metal coaxial cavity with lower cost and more mature technology has become the mainstream choice of the market.
    With the development of mobile communication network, the wireless frequency band becomes very dense, which leads to the incompatibility problem of metal cavity filter which can not achieve high suppression. Ceramic dielectric material can be used to make cavity filter to solve the above problems. Question. Compared with the traditional metal cavity resonator, the ceramic dielectric resonator filter has the characteristics of high rejection, low insertion loss and good temperature drift, and the power capacity and passive intermodulation performance have been greatly improved.  Ceramic dielectric resonant filter represents the development direction of high-end RF devices. With its excellent performance, it has a broader application space in the field of mobile communications.
    The new change of base station filter in 5G era - ceramic dielectric filter: 5G era, limited by Massive MIMO requirements for large-scale antenna integration, the filter needs to be more miniaturized and integrated. Electromagnetic resonance in ceramic dielectric filters occurs in the interior of dielectric materials. Without a metal cavity, the size of the filter will be smaller than the two filters mentioned above. At the same time, it has the advantages of both ceramic dielectric resonant filters, and the cost will be lower once mass production is achieved. We think that ceramic dielectric filter is expected to become the mainstream choice in the middle and low frequency section of 5G.
    Suggestion: Ceramic dielectric filters used in the dielectric material is not natural, must be manufactured by artificial synthesis, need to be made by a variety of materials in accordance with a certain proportion of casting and pressing, production process is more complex, which has led to the further upgrading of the manufacturing threshold.

    date2018-8-9 Read6447second
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