Research Of Dielectric Resonator Antennas With High Efficiency And Derectivity

With the development of information network, people enter the wireless internet age. Wireless interconnection technology of the new generation will achieve wireless transmission of electric products with Gigabit rate, so that people appreciate the convenience of high speed wireless transmission. Development of these emerging interconnection technologies needs to be combined with the wireless systems designs with high efficiency, high integration, low power and low cost. The antenna is the important component of the wireless communication system. Wireless interconnection technology uses the antenna technology to replace the traditional metal interconnection, achieving the interconnection inside the chip or between chips. However, antennas on silicon substrate of wireless interconnection have the serious problem of low efficiency. The difference of radiation direction can also influence the space radiation efficiency. Dielectric resonator antennas(DRAs) have the advantages of small size, flexible feed modes,high radiation efficiency and multiple operation modes, which are suitable to solve the above problems. This paper takes the dielectric resonator antenna as the radiation element. The research concentrates on the high efficiency and high directivity.Firstly, the research background and significance are introduced. The state-of-the-art of dielectric resonator antenna is summarized. And then the basic theory of the dielectric resonator antenna is presented, including the analysis method of the cylindrical dielectric resonator antenna, the basic parameters of the DRA, and feed modes. Secondly, aiming at high efficiency and directivity of the DRA, the work is summarized as following.1. The efficiency of the DRA based on silicon substrate is studied. The key-shaped DR is used as the radiation element, covering the microstrip transmission line. Meanwhile, the air cavity is embedded in the silicon substrate, reducing the lost energy coupled into the silicon substrate. Radiation efficiency and feed efficiency are improved. In the range of 57~65GHz, the antenna efficiency increases from 4.5%~8% to 17%~22%.2. Directivity of the DRA in the low-order modes is studied. The cylinder DRA, the cylinder ring DRA and the cylinder ring DRA attached with a copper are designed and compared. By changing the electric field distributions of the dielectric resonators, wide beam, narrow beam and saddle-shaped beam are obtained.3. Suppressing the cross polarization level of the probe-fed DRA is studied. The cylinder ring DRA attached with a copper foil is designed. The electric field distribution is changed. Compared with the ordinary cylinder ring DRA, the cross polarization level of the proposed antenna drops 15 d B and the gain increased 0.5d B as well.4. A dielectric resonator antenna design with an inclined radiation is studied. A hole is punched on the side away from the feed point and metallized. By analyzing and optimizing the size and position of the hole, the stable inclined radiation of the cylindrical DRA is achieved. In the bandwidth of 400 MHz, the inclined radiation angle is stable from 36° to 37°.