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Conventional reflectarray elements have only phase-control property, and this letter presents novel reflectarray elements with both amplitude and phase control using proper resistor loading. Two amplitude-controllable reflectarray elements are presented with different phase tuning techniques. It is shown that the reflection amplitude for each element only depends on the resistor value, while the reflection...
A 1-bit reconfigurable reflectarray antenna consisting of 10×10 elements is fabricated and measured for proof-of-principle in high-gain beam-scanning antenna designs. The element is reconfigured by a PIN diode. By controlling the biasing voltage on each PIN, beam scanning performance of the reflectarray is obtained. The measured results show that both the radiation patterns and gains can be improved...
In this paper we report on a broad band reflectarray antenna using sub- wavelength elements based on variable size patch element analysis. Two Ka-band reflectarrays using single layer variable patch sizes as phasing elements have been developed. One is designed with the conventional lambda/2 element spacing and the other one with lambda/3 element spacing. Although both antennas demonstrate good performance,...
The paper demonstrates that the reflection coefficient calculated using the frequency dependent microchip impedance shows better agreement between the simulation and measurement than power reflection coefficients calculated from fixed frequency microchip impedances. Thus it is recommended to consider this procedure while designing tag antennas for better performance across the desired frequency band...
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