| With the rapid development of mobile communication technology,third-generation mobile communications,fourth-generation mobile communications and other new types of communication systems emerged,making the existing spectrum resources become unusually tense.Which seriously hampered the rapid development of wireless communication technology.Ultra Wideband(UWB)antenna technology and millimeter-wave antenna technology based on Substrate integrated waveguide(SIW)are two effective ways to solve these problems.At present,most UWB antennas are a series of problems that are too large to cover all the frequency bands of the UWB communication system.In addition,the current use of the notch technology is relatively behind,to be innovative.At the same time,most UWB notch antenna still has the notch band relatively single,the interference between each notch band is big and other issues.Electromagnetic metamaterials as a new type of artificial electromagnetic materials,with a series of traditional materials do not have the special electromagnetic properties.The application of electromagnetic metamaterials to the design of UWB notch antenna not only can obtain the excellent UWB notch antenna,but also can realize the antenna miniaturization further.The SIW-based antenna can not only work effectively in the millimeter-wave band,but also has the advantages of high gain and good directivity,which makes the SIW-based antenna have a wide application prospect in the future mobile communication system..However,most of the current SIW-based antennas have a narrow operating frequency band,which limits the application of SIW antennas to a large extent.SIW antenna with electromagnetic metamaterials is not only able to keep the SIW antenna high gain,good direction and so on,but also can greatly expand the working bandwidth of SIW antenna.At present,the common metamaterials are mainly split-ring resonator/complementary split-ring resonator?left hand material and complementary left and right hand transmission line and so on.In this paper,the application of complementary split-ring resonator and left hand material in ultra-wideband notch antenna and SIW-based antenna design are studied.The main achievements are as follows:1.Based on the electromagnetic metamaterials proposed three with the notch characteristics of ultra-wideband antenna(1)The first antenna achieves the notch function by etching two reverse complementary opening resonant ring gap structures on the spade-shaped radiation sheet.The antenna is fabricated on a FR4 dielectric plate with a dielectric constant of 4.4.,finally,the working frequency of the antenna is 3-11.07GHz,and the notch function of 3.13-3.77GHz and 5.26-6.12GHz is realized,in addition,the size of the antenna is 18×22×1.5mm~3.(2)The second section is a three-trap ultra-wideband antenna which achieves a three-trap function by etching two coaxial circular opening resonant ring gap structures and a rectangular opening resonant ring gap structure on a radiation patch,Also produced in the dielectric constant of 4.4 on the FR4 dielectric plate,and ultimately from the test results we can see:the antenna operating frequency band 3.1-11GHz,while achieving the 3.2-3.97GHz,5.1-5.8GHz,7.3-7.9GHz three bands notch function,and the size of the antenna is only 14×22×1.6mm~3.(3)The third antenna combined with ultra-wideband and left-handed material technology,designed a double notched UWB antenna based on the left handed materials.First,a miniature UWB antenna was introduced on the back of the media plate to introduce a forked left-handed material array structure.The antenna was fabricated on a FR4 dielectric plate with a dielectric constant of 4.4 and had a size of only 20×20×1.6 mm~3.The test results show that the operating frequency band of the antenna is 3.1-10.5GHz,the notch frequency band is 5.1-6GHz and 7.2-8.3GHz two bands.2.Design of multi-frequency back-cavity slot antenna based on SIW.Antenna media plate selection of the dielectric constant of 2.2 Rogers Duroid 5880.(1)Design of a tri-band back-cavity slot antenna based on SIW.The antenna achieves a tri-band back-cavity slot antenna by etching a slot structure of a single-opening resonant ring on the back of the rectangular substrate integrated waveguide.The operating frequency band is 27.5-28.1 GHz,29.5-30.3 GHz,31.2-32.2 GHz.The size is 19.8 × 17 × 0.5mm~3.(2)Design of a dual-band broadband back-cavity slot antenna based on SIW.The antenna on the basis of an antenna on a single open resonant ring gap structure into a complementary aperture resonant ring gap structure,has been a dual-band broadband backlash slot antenna.The operating frequency band of the antenna is 27.2-28.3 GHz,29.2-31 GHz,and the size is 19.8×17×0.5 mm~3.(3)A two-cell SIW back-cavity slot array antenna design.On the basis of a SIW back cavity slot antenna,a two-unit SIW back cavity slot antenna is obtained by introducing a T-shaped feed structure.The working frequency band of the antenna is:28.2-32.3GHz,the size of the antenna is only 39.6×34×0.508mm~3. |
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