Research On High Efficiency Water Antenna Based On Dielectric Loading

With the development of technology and the deepening of research,each part of information transmission is continuously developing and making progress to promote the continuous development of communication technology.As a key part in wireless communication technology,antenna plays an extremely important role.In order to meet the increasingly stringent communication technology standards,it is more and more difficult to break through the traditional structure design.In this case,we need to devote more research energy to the design and manufacture of new materials in antenna design and manufacture.The concept of liquid antenna is a very important research direction of new materials in antenna design.In this article,the liquid with high dielectric constant is used as the substitute material of metal structure or dielectric resonator structure in the traditional antenna.This paper studies how to increase the bandwidth of liquid antenna and reduce the dielectric loss of liquid antenna to achieve the high efficiency of liquid antenna.The specific work is as follows:1.Designed a wideband high efficiency liquid inverted F type antenna.Using the physical property that the dielectric with high dielectric constant is equivalent to the electric wall in the electromagnetic field,the patch antenna is designed.The radiation and short-circuit part of the antenna are made of non-metallic,low-permittivity transparent Acrylic plastics material wrapping in pure water and compared with traditional metal patch antenna,this antenna has wider bandwidth and overcomes the disadvantage of low radiation efficiency of liquid antenna as well.At the same time,the materials used to construct the antenna are cheap and easy to obtain that makes the cost of the antenna is much lower than that of the traditional metal patch antenna.2.Designed a reconfigurable E-type patch antenna working in digital TV frequency.The dual-mode design of the antenna is realized by slit on the lower metal to change the current distribution of the antenna.A square liquid water dielectric resonator is loaded on the top of the E-type metal patch,and the height of the liquid water is changed.On the one hand,it can affect the two basic modes of E type metal and adjust the matching of antennas.On the other hand,it can produce a new dielectric resonant mode in higher frequency band to realize the reconfigurable characteristics of antenna frequency.can cover the 490-615 mhz band of digital TV.3.Designed a broadband high efficiency liquid patch antenna.A patch antenna is designed using the physical property that the medium with high dielectric constant is equivalent to the electric wall in the electromagnetic field.The water of high dielectric constant is used as the patch,and an analogous resonant cavity is formed between the high dielectric constant and the floor.By introducing a new mode into the rotating symmetric structure,the broadband antenna design is realized.The antenna can achieve a relative bandwidth of 47%(2.02GHz-3.26GHz),and the water medium with high dielectric loss does not participate in the radiation of the antenna.Therefore,the energy loss is reduced effectively and the design of high radiation efficiency is realized.The radiation efficiency in the antenna bandwidth is 78%?82%.