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Reflectarray antennas have been widely used in communications and national defense because of their remarkable advantages such as high gain, low loss, low profile, and etc. In the design of reflectarray antennas, the relation between the reflection phase of every element and its dimensions is usually computed through element simulation with infinite periodic boundary conditions. However, this assumption...
This paper proposes a 1-bit linearly polarized reconfigurable transmitarray element with double-layer square slots. The theory for the cascaded 2-layer transmitarray element is presented first, and a dielectric thickness corresponding to a 30° phase delay is suggested as the layer separation in order to get a 180° phase difference with less than 1-dB magnitude loss. The double-layer square slot element...
The design of an X-band circularly polarized reconfigurable reflectarray antenna is presented. Elements with concentric dual split rings are mechanically rotated by micromotors to achieve phase reconfigurability with low cross-polarization and low element loss. Simulation results show that a maximum gain of 26.43 dB with aperture efficiency of 62.9% is achieved by a reflectarray with 15×15 elements...
The design of a Ku-band reconfigurable reflectarray element is presented in this paper. The element structure of a microstrip patch loaded with two asymmetric slots are employed, on which two MEMS switches are integrated to achieve a 2-bit phase reconfigurability. Simulation results show that four well-distributed phase states can be electronically controlled, and the maximum element amplitude loss...
A novel linearly polarized metal-only slot-type Phoenix reflectarray element is proposed. It is able to achieve a full 360° phase coverage and stable responses for different incidence angles. The unique slot-type element design unifies all the elements into a whole piece so that the dielectric substrate is no longer required. A Ku-band reflectarray antenna with a circular aperture of 512 mm in diameter...
With the increasing interest in the applications of large deployable reflector antennas operating at high frequencies, the requirement on the reflector surface accuracy becomes more demanding. Thermal effects inevitably cause certain reflector surface distortions, thus degrading the overall antenna performance. This paper introduces a novel reflector surface distortion compensation technique using...
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