| With the high-speed picture, video, streaming media and other complex information of high-speed data transmission has become an increasingly urgent new needs of today's wireless communication system bandwidth, transmission rate put forward higher requirements. Ultra-wideband communication technology has become one of the most competitive and promising technologies in the field of wireless communication and has been successfully applied in communication sensing, high-resolution radar, wireless location tracking and monitoring. In 2002, the Federal Communications Commission allocated ultra-wideband wireless communications to the 3.1 GHz - 10.6 GHz band, and the ultra-wideband communication system became a new hotspot in academia and industry at home and abroad. Ultra-wideband antenna is one of the most important components of ultra-wideband system, responsible for sending and receiving signals and other important tasks. However, with a variety of narrowband communication systems continue to increase, spectrum resources are increasingly tense. At present, the working frequency bands of narrowband wireless communication systems such as global microwave access interoperable systems and wireless local area networks are included in the ultra-wideband wireless communication band, and these bands are isolated from the UWB band in order to suppress the potential interference between the various communication systems. Therefore, it is necessary to design an ultra-wideband antenna with a stop-band characteristic, that is, a band notch function.so that the antenna exhibits a stopband or "passivation" characteristic in these narrowband bands,that is,electromagnetic radiation in the radiation and reception space.The main research and innovation work in this paper is summarized as follows:[1] This paper briefly introduces the development history and basic theory of UWB antenna and the development and research status of notch UWB antenna.[2] In this paper,we first design a flat racquet monopole double band notch ultra-wideband antenna, through the racquet-shaped radiation patch and rectangular feed line etching inverted C-shaped groove and U-shaped groove,to achieve two trap frequency band (3.3 GHz - 3.7 GHz, 5.15 GHz - 5.825 GHz).Then, this paper designs the second ultra-wideband antenna with planar elliptical gap structure, which paves the way for the later triple band notch antenna. Finally, based on the notional wave technique of the first antenna and the research basis of the second antenna, this paper designs the third ultra-wideband antenna with triple band notch characteristics. By adding an asymmetric open resonant ring on the bottom of the substrate, to achieve the antenna in the X-band satellite communication system (7.25 GHz - 8.4 GHz)band to produce band notch characteristics.[3]The author has processed three antennas, its S11 and voltage standing wave ratio show that the design of antenna working band can fully cover ultra-wideband band, and have good band-resistance and band notch function in narrowband communication bands requiring trapped waves, and the results of physical measurement and software simulation are roughly unified. The 2d/3d radiation directions of the antenna show that the two notch antennas have stable and uniform radiation characteristics in the working band of Ultra-wideband communication system,and have a certain practical value in the notch band. |
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