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A metaloop antenna that has a negative propagation phase constant for the current on its closed arm is proposed and investigated. A linearly polarized (LP) broadside radiation pattern is obtained at different frequencies below and above frequency fT, where the propagation phase constant is zero. In addition, it is revealed that the metaloop forms an LP dual-peak radiation pattern at different frequencies...
A curl antenna with a lossy structure is investigated. After presenting the lossless case (Case 0) as the reference for the investigation, the case where lossy capacitors are inserted into the curl arm (Case RCL) is analyzed. Subsequently, the case where lossy inductors are inserted into the curl arm (Case RLL) is investigated. It is found that the radiation pattern for each lossy case is similar...
A dual-band counter circularly-polarized (CP) loop antenna is proposed, where the antenna has a single feed point. Analysis is performed to reveal the effects of a lossy antenna structure on the radiation characteristics. The amount of reduction in the maximum gain and radiation efficiency due to the losses is revealed.
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