Download e-book for iPad: Basic Principles of Fresnel Antenna Arrays by Igor V. Minin, Oleg V. Minin

By Igor V. Minin, Oleg V. Minin

ISBN-10: 3540795588

ISBN-13: 9783540795582

ISBN-10: 3540795596

ISBN-13: 9783540795599

The short common fundamentals of antenna arrays -- Lens applicants to antenna array -- FZP lens array -- a few fields of lens array purposes

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Extra info for Basic Principles of Fresnel Antenna Arrays

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16 1 The Brief Elementary Basics of Antenna Arrays source to the specific point on the surface. As shown in Fig. 7a, if the point on the surface is A, this creates a triangle between the rays SO, SA, and the radius rA. The electrical path difference between SA and SO is the phase at point A. Since the source wave is spherical, all rays from the source to points on the surface at constant radii from O will have the same path difference. This results in constant phase spheres centered around O, which form circles on the planar surface.

In defining these zones of constructive and destructive radiation, Fresnel [9] assigned a specific phase origin or reference phase of 0° to the shortest ray connecting the source and detection point in order to simplify the analysis. Based on Fresnel’s analysis, Soret later demonstrated focusing in half opaque zone plates, which blocked radiation from what was defined as the destructively interfering zones [56]; the same choice of phase origin as Fresnel was used. Later work has shown that the out-ofphase zones need not be blocked if selective phase shifts are introduced into the zone plate [14, 57, 58].

The value of R0 is given in units of (λB)1/2. 2. I/Imax is the normalized field intensity at the distribution peak. 3. I0/I is the intensity of the central (axial) maximum relative to the maximum intensity within the ring. 4. Δr is the width of the ring at the indicated intensity levels. The results shown in Fig. 1 imply that even for binary diffractive elements, the field intensity distribution function can be corrected in the focal area by choosing R0. Similar effects are achieved also for elements that focus radiation onto an area of arbitrary shape, for instance, onto longitudinal or transversal segments, an ellipse, a transversal (relative to the optical axis) smooth curve, etc.

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Basic Principles of Fresnel Antenna Arrays by Igor V. Minin, Oleg V. Minin


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