A compact design of microwave jet based on parallel-plate waveguide
To address the problem of large volume,heavy weight and low integration level of traditional microwave jet devices,a compact design was proposed based on the parallel-plate waveguide. Excited by a 50 Ω coaxial cable,the parallel-plate waveguide supports the propagation of TM0 mode in the form of a cylindrical wave within it. To generate microwave jet around specified focal point near the end of the waveguide,the phase compensation condition was derived for in-phase superposition of all rays at the focal point through analyzing the difference between ray paths from the feeding source to the focal point. Further,a transmission-type metasurface unit cell was designed by using a single dielectric substrate. And its transmission phase at 10 GHz can be tuned over a range of 2π by varying its geometrical dimensions to meet the phase compensation condition. A microwave jet was generated at the end of the parallel-plate waveguide after integrating the unit cells with different dimensions in the form of a one-dimensional linear array. In addition,the backscattering enhancement due to the microwave jet was analyzed for a conductive cylinder with a submillimeter-level diameter. The agreement between full-wave simulation and experiment validated the design. The compact design of the microwave jet can provide a basis for the practical application of microwave detection of fine objects.
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维普
