Time division-synchronization code division multiple access (TD-SCDMA) and time division-long term evolution (TD-LTE) intelligent antenna multi-channel broadband calibration network

Abstract

The invention discloses a time division-synchronization code division multiple access (TD-SCDMA) and time division-long term evolution (TD-LTE) intelligent antenna multi-channel broadband calibration network. The multi-channel broadband calibration network (11) is characterized in that: a micro-strip coplanar waveguide structure is adopted; the two ends of a coupling line of a coupler are loaded with crossed coupling lines; and a metal shield box is eliminated. An entire structure comprises a plurality of power dividers, a plurality of directional couplers and an installation plate (12), wherein each power divider and each directional coupler adopt micro-strip coplanar waveguide structures (2); crossed coupling lines (5) are loaded between coupling lines of each directional coupler; a radiofrequency cable core is welded with each directional coupler through a through hole on the installation plate and a metallized via hole on the directional coupler; the sheath of a cable is welded with a back face grounding layer; one side, in the same direction as an antenna, of the installation plate is provided with a metal flange (14); and the installation plate is arranged on an antenna bottom plate (15). The network has the advantages of high electric index, simple structure and contribution to mass production.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to a multi-channel broadband calibration network used for TD-SCDMA and TD-SCDMA long-term evolution system TD-LTE smart antennas. Background technique [0002] The TD-SCDMA technology proposed by China is one of the three major 3G standards of WCDMA, CDMA2000 and TD-SCDMA recommended by the International Telecommunications Union. The time division duplex TDD method adopted by TD-SCDMA is obviously different from the frequency division duplex FDD method adopted by WCDMA and CDMA2000. Its biggest feature is that the receive / transmit duplex uses the same uplink / downlink frequency in different time slots. As one of the key components and technical highlights of TD-SCDMA network, the smart antenna has been widely used and studied deeply. With the development of TD technology and TD-LTE, the frequency used is also extended from the initial FA segment, namely 1880-1920MHz, 2010-2025MHz t...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing TD-SCDMA calibration networks adopt the structure of direct coupling and metal shielding box, and the installation method is also relatively complicated. Although it meets the use requirements in the FA frequency band, the broadband performance is poor, and it cannot meet the requirements of wide-band TD-SCDMA and TD-SCDMA at the same time. TD-LTE's high performance requirements, and the broadband performance of the calibration network directly affects the use of smart antennas on broadband

Since the smart antenna is arranged in multiple arrays, the internal space is narrow, the electromagnetic environment is complex, reflection and scattering cannot be avoided, and the calibration network as one of the antenna components will also be affected by the electromagnetic environment inside the antenna, and the indicators will deteriorate. These factors cause the smart antenna The performance of the antenna is degraded or unusable, seriously affecting the product quality and production capacity of smart antenna manufacturers

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