Download Reflectarray Antennas Analysis, Design, Fabrication, and by Jafar Shaker, Mohammad Reza Chaharmir, Jonathan Ethier PDF
By Jafar Shaker, Mohammad Reza Chaharmir, Jonathan Ethier
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Additional info for Reflectarray Antennas Analysis, Design, Fabrication, and Measurement
Example text
From: [9]. ) level, namely, microstrip patch. It is known that increasing the substrate permittivity increases the reactive power which drives up the quality factor Q and reduces the bandwidth of a microstrip patch element [2, 6]. 12. Generally, the width of the phase transition region represents the width of the resonance. Therefore, more gradual slope represents a wider transition and also wider element bandwidth. 13, which demonstrates reduction of the realizable phase range as the substrate height is increased.
Of wideband microstrip radiators and attempts to exploit this same feature of the isolated radiator to broaden the operating band of the reflectarray. 8. 9a3). (© 2001 IEEE. ) three-layer cell element is also shown in the same figure. It is to be noted that the size of patch elements of a given cell were varied simultaneously and the relative size of the patches on the layers (whether a two- or three-layer cell element) was held constant. As will be seen in the case of multiresonant loop elements, this is only one of the strategies in the toolbox of the designer to achieve a wideband cell element.
B) Proposed design with mirror symmetry to reduce cross-polarization. (© 1995 IEEE. 23 [22]. Two different implementations of the delay line have been have been introduced in the figure to realize truncated 360° and phase delay in excess of 360° to achieve true time delay and increase the reflectarray bandwidth, as will be discussed in Chapter 6. 24 for U-shaped delay line which shows close to 3 × 360° phase shift for the whole range of line length. 1. 25, which also provides a comparison between the required phase for reflectarrays composed of elements with one and three cycles of 360°.