Counter circularly-polarized curl antenna with a lossy structure

Nakano, Hisamatsu; Okuyama, Yuki; Miyake, Jun; Yamauchi, Junji

doi:10.1109/aps.2013.6710738

Cited by 1 publication

(1 citation statement)

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“…Recently, a CP curl antenna that differs from conventional curl antennas has been proposed [23]. This curl antenna is called a metamaterial curl antenna or a metacurl antenna, whose antenna arm is made of a C-type metamaterial line, which has the same operating mechanism as that for a composite right-and left-handed (CRLH) transmission line [24]- [26].…”

Section: Introductionmentioning

confidence: 99%

Compound Metacurl Antenna With C- and N-Type Metaatoms

et al. 2020

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A metacurl antenna made of C-type metaatoms (forming a C-type metaline), called the C-metacurl antenna, is investigated. The investigation reveals that the gain for a left-handed circularly polarized wave, LHCP gain, has a maximum value at frequency f LH and the gain for a right-handed circularly polarized wave, RHCP gain, has a maximum value at different frequency f RH , where the maximum LHCP gain is smaller than the maximum RHCP gain. Subsequently, a different metaatom that forms the unit cell of an N-type metaline, called the N-type metaatom, is investigated. It is found that the radiation from the N-type metaatom is LHCP. This infers that the maximum LHCP gain for the C-metacurl antenna will increase when some C-type metaatoms are replaced by N-type metaatoms. Based on this inference, a novel metacurl antenna composed of C-type metaatoms and N-type metaatoms, called the compound metacurl antenna, is analyzed. The analysis reveals that replacement with an appropriate number of N-type metaatoms increases the maximum LHCP gain, resulting in a balancing of LHCP gain and RHCP gain. The antenna characteristics under such a gain-balanced situation, including the radiation pattern, axial ratio, and input characteristic (VSWR), are also discussed. INDEX TERMS Metacurl antennas, metaatoms, circularly polarized wave, gain.

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Section: Introductionmentioning

confidence: 99%