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학술지 Generalized Friis Transmission Equation for Orbital Angular Momentum Radios
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저자
조용희, 변우진
발행일
201904
출처
IEEE Transactions on Antennas and Propagation, v.67 no.4, pp.2423-2429
ISSN
0018-926X
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TAP.2019.2891438
협약과제
18HR1400, 선제적 주파수 이용을 위한 시·공간적 스펙트럼 엔지니어링 기술 개발, 정영준
초록
Generalization of a Friis transmission equation for orbital angular momentum (OAM) radios is rigorously formulated using the Lorentz reciprocity theorem and a near-and-far-field convolution integral (NFCI). Based on the discretization of NFCIs, we computed the generalized Friis transmission equation to obtain the power-receiving behaviors of practical helicoidal parabolic reflector antennas (HPRAs) with continuously deformed surfaces. A simplified Friis equation is also used for computing the link budget and approximate Rayleigh length of discrete uniform circular arrays (UCAs) composed of 2× 2 dipole antennas. The transmission coefficients for the given OAM modes, represented by our equations for the HPRA and UCA, agree very well with commercial numerical simulators. In addition, an m th-order NFCI, which is an orthogonal convolution integral for the m th OAM mode, is proposed to define a figure of merit for the OAM mode purity of transmitting and receiving antennas.
키워드
Antenna arrays, electromagnetic (EM) propagation, receiving antennas, reciprocity principle, reflector antennas, transmitting antennas
KSP 제안 키워드
Convolution integral, Dipole antenna, Far-field, Figure of merit, Friis Equation, Link budget, Lorentz reciprocity, Mode purity, OAM modes, Orbital Angular Momentum, Rayleigh length