Reflectarray Antennas by John Huang

By John Huang

Describes the configuration and rules of a reflectarray antenna, its benefits over different antennas, the historical past of its improvement, research thoughts, sensible layout tactics, bandwidth matters and wideband options, in addition to purposes and up to date advancements. either authors are good revered practitioners who've construct those antennas and constructed them for house flight.

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3 PHASE-SHIFT DISTRIBUTION The phase-shift that must be introduced at each element to produce a collimated beam in a given direction is determined in this section. Considering the coordinate system detailed in Fig. 1) where k0 is the propagation constant in vacuum, and (xi, yi) the coordinates of element i. 2) where, fR(xi, yi) is the phase of the reflection coefficient, or phase-shift, for element i, di is the distance from the phase center of the feed to the cell. 3) Fig. 3 shows the required phase-shift on a circular reflectarray of 30 × 30 elements with the focal point centered that produces a pencil beam in a direction normal to the surface.

Okoniewski, “An electronically tunable reflectarray using varactor-diode-tuned elements,” IEEE AP-S/URSI Symposium, Monterey, California, June 2004, Vol. 2, pp. 1827–1830. 23. S. V. Hum, G. McFeetors, and M. Okoniewski, “A reflectarray cell based on a tunable MEMS capacitor,” IEEE AP-S/URSI Symposium, Albuquerque, New Mexico, July 2006, URSI session 458. 24. A. Martynyuk, J. Lopez, J. Cuevas, and Y. Sydoruk, “Wideband reflective array based on loaded metal rings,” IEEE MTT-S Microwave symposium, Long Beach, California, June 2005.

8) is reduced to T A = S11 D. 17) The reflection coefficient for TE and TM polarized waves are, respectively, the T elements (1,1) and (L + 1, L + 1) of the submatrix S11 . The coefficients that generate cross-polarization, that is, reflection of TE when TM is incident, or T vice versa, are the elements (1, L + 1) or (L + 1, 1) of S11 , respectively. An arbitrary field incident on a periodic cell will be broken down into TE and TM components, and will be defined by the amplitudes d1 and dL+1 according to Eqs.

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