A system development method by Jackson M.A

By Jackson M.A

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Two things happen when a dielectric slab is added next to a periodic structure: First, the resonant frequency fo changes. , it is easy to see from Maxwell’s equations that the resonant frequency would reduce in frequency with the factor &, as illustrated in Fig. 9 top. If the extent of the infinite dielectric is reduced into dielectric slabs of a small, finite thickness 2d, as shown in Fig. 9 bottom-left curve, the resonant frequency will change to somewhere between f o and to/&. 05h,, the resonant frequency is fairly close to f o / & (for more details, see Appendix E).

1. Periodic structure of electric conductors (dipoles) with load impedances Z L . Top: Passive case. The structure is excited by an incident plane wave E' which is being partly reflected in the specular direction ( E " ) and partly transmitted in the forward direction (if). Bottom: Active case. Each element is excited by individual generators with the same amplitude and each has a linear phase variation across the aperture as shown. (sx and si denote the directional cosines along the x- and z-axes, respectively).

18. The transmission coefficient curves for various angles of incidence for: Tipleft: A dielectric only h,/2 radome panel. Top-right: A slotted surface only panel. : Combination of the h,/2 and metal mounted to one side with thin layers of dielectric on both sides. Bottom-right: With the slotted surface placed in the middle of a h,/2 radome panel. Note the difference in bandwidth variation in the two bottom cases. 23 GRATING LOBES lossless radome panel, conservation of energy simply requires for the reflection and transmission coefficient r and 7 ,respectively, that r2+ 7 2= 1.

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