By Hisamatsu Nakano
Presents fresh growth in low-profile average and metamaterial antennas
This booklet offers the total diversity of low-profile antennas that use novel components and make the most of new thoughts in antenna implementation, together with metamaterials. commonly shaped by means of developing lattices of straightforward parts, metamaterials own electromagnetic homes no longer present in certainly happening fabrics, and express nice promise in a few low-profile antenna implementations. Introductory chapters outline quite a few usual and metamaterial-based antennas and supply the basics of writing computing device courses according to the tactic of moments (MoM) and the finite-difference time-domain procedure (FDTDM). Chapters then speak about low-profile traditional antennas labeled into base station antennas, cellular card antennas, beam-forming antennas, and satellite-satellite and earth-satellite communications antennas. ultimate chapters examine houses of low-profile metamaterial-based antennas, revealing the strengths and barriers of the metamaterial-based immediately line antenna (metaline antenna), metamaterial-based loop antenna (metaloop), open metaloop antenna, the consequences of counter dual-band CP radiation, and more.
- Offers finished insurance of either metamaterials and usual fabrics for low-profile antennas
- Written by means of an internationally-recognized specialist within the box of low-profile antennas
- Depicts real high-performance low-profile antennas for the antenna engineer
- Draws on classroom-tested fabric in graduate classes and brief classes during the last 20 years
Low-Profile usual and Metamaterial Antennas is a must have reference e-book for complicated undergraduate and graduate point scholars in addition to antenna engineers attracted to low-profile antenna layout theory.
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Extra info for Low-profile Natural and Metamaterial Antennas: Analysis Methods and Applications
Is the Bessel function of the ﬁrst kind of order 0. Formulate the scattered ﬁeld in z > 0, Πzs , and the transmitted ﬁeld in z < 0, Πzt . Answer The divergence of the Hertzian vector Π Πz^z Πz^z is @Πz @z (2:203) Hence, 1 @ 2 Πz ^ ϕ ρ @ϕ@z @ 2 Πz ^z @z2 where a spherical coordinate system is used. 18 Current source above the interface. 9 Integral Equation N5 for an Arbitrarily Shaped Wire Antenna Based on these results, the electromagnetic ﬁelds E Π k 2 Π and H homogeneous medium characterized by ε, μ, and k ω εμ are written as E @ 2 Πz ^ ρ @ρ@z 1 @ 2 Πz ^ ϕ ρ @ϕ@z @ 2 Πz ^z; @z2 k 2 Πz H 1 @Πz ^ ρ ρ @ϕ jωε jωε @Πz ^ ϕ @ρ 45 Π in a (2:206) Let the electromagnetic ﬁelds above interface i and the corresponding Hertzian vector be E 0 and H 0 and Πz0 , respectively, and let those below the interface be E 1 and H 1 and Πz1 , respectively.
IEEE Trans. , vol. 36, no. 12, pp. 1667–1674, 1988. 17. H. Nakano, K. Hirose, T. Suzuki, S. R. G. Alexopoulos, Numerical analyses of printed line antennas. IEE Proc. Microw. Antennas Propag. H, vol. 136, no. 2, pp. 98–104, 1989. 18. H. Nakano, A numerical approach to line antennas printed on dielectric materials. Comput. Phys. , vol. 68, pp. 441–450, 1991. 19. H. Nakano, T. Kawano, Y. Kozono, and J. Yamauchi, A fast MoM calculation technique using sinusoidal basis and testing functions for a wire on a dielectric substrate and its application to mean der loop and grid array antennas.
29) is written as Ez where β 1 jωε ∫ L L @ 2 V z; z @z2 β2 V z; z I z dz (2:30) ω με and I z are the current (line distribution) at z . 1 A straight-wire conductor. E iz 0 (2:33) 16 Chapter 2 Integral Equations and Method of Moments where E iz is the z-axis component of the incident electric ﬁeld or the applied electric ﬁeld. Substituting Eq. 30) into Eq. 33), we have L 1 Iz jωε ∫ L @ 2 V z; z @z2 β2 V z; z dz Eiz z 0 (2:34) Eq. 34) is called Pocklington’s integral equation [4–6]. Note that V z; z and E iz z in the integral equation are known functions, and I z is an unknown func tion.