| 摘要 |
An antenna is formed from two antenna elements, a first antenna element and a second antenna element, wherein the second antenna element surrounds the first antenna element. A shorting element electrically connects the inner antenna element to the outer antenna element. An insulating gap insulates the inner antenna element from the outer antenna element except for the region where the shorting element connects the two antenna elements. A coaxial cable connects the antenna to a transceiver. The inner conductor of the coaxial cable is connected to the first antenna element and the outer conductor of the coaxial cable is connected to the second antenna element. The length of the outer perimeter of the first antenna element is equal to an integral multiple of one quarter of the wavelength of the center frequency of the antenna. The inner antenna element can be rectangular, square, circular, oval, or any similar shape. More than one antenna can be formed on a single layer of dielectric material. The impedance of the antenna is tuned by adjusting the location of the shorting element, the location of the connection of the inner conductor of the coaxial cable to the first antenna element, and the location at which the coaxial cable exits the second antenna element.
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