| 摘要 |
A dielectric-loaded antenna having a plurality of radiating elements and a loop element plated on the surface of a cylindrical ceramic core has balanced and single-ended modes of resonance which are coupled together so as to define an operating frequency band. The two modes of resonance are associated with different respective radio frequency current patterns in the radiating elements, and the input reactance component of the load represented by the antenna at its feedpoint is substantially zero within the operating frequency band only when the corresponding input resistance component is finite and substantially non-zero. |
