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The radiation from a conventional metamaterial loop antenna (metaloop) is circularly polarized within two frequency bands. This paper reveals that the radiation from a novel metaloop, where stubs are added to the loop arm, is circularly polarized within three frequency bands specified by the Nion frequency, Hion frequency, and upper band-edge frequency for a fast wave. The antenna characteristics,...
An inverted LFFL card antenna (InvLFFL) is designed as a quadband antenna, where target frequency bands are 1.7 GHz, 2.45 GHz, 3.5 GHz, and 5.2 GHz bands. The InvLFFL is composed of a modified inverted L element, two inverted F elements, and a parasitic inverted L element. The design is performed based on one-quarter wavelength resonance at each band. The InvLFFL has a 4.6% bandwidth around 1.7 GHz,...
The radiation from a metamaterial spiral (MTSP) is investigated. The MTSP radiates a left-handed circularly polarized (CP) wave, a right-handed CP wave, and a linearly polarized (LP) wave. Effects of antenna size on the antenna characteristics, including the radiation pattern, axial ratio, polarization, and gain, are discussed.
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 single-arm spiral antenna whose arm is made of a metamaterial (MTM) transmission line having right- and left- handed properties is discussed. This antenna, abbreviated as the 1-MTM-SPA, has an extremely low-profile structure (0.016 wavelength at a balanced frequency of 3 GHz) and does not need a balun circuit. It is predicted that the 1-MTM-SPA will operate as a circularly polarized (CP) antenna,...
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