KoREMA - Croatian Society for Communications, Computing, Electronics, Measurement and Control
Abstract
Active reflectarrays having beam control are presented in this paper. The steering capability is obtained by achieving different amplitude and phase of the scattered field from each reflectarray element, which is controlled by the use of an IQ modulator in some cases. An aperture coupled patch with perpendicular microstrip feeds is employed as radiating element. One of its ports is employed to receive the signal and the other to retransmit it with the phase and gain selected in the amplitude/phase control unit. The beam control can be also obtained by means of switching circuit. A laboratory experience with 1-bit reflectarray of 4 × 4 elements shows the beam control performance, and a study to simplify manufacturing process of 3-bit reflectarray is also presented.U ovom su radu prikazani aktivni reflektorski nizovi s kontrolom snopa. Sposobnost zakretanja snopa dobivena je primjenom različitih amplituda i faza raspršenog polja iz elementa reflektorskog niza, koji je kontroliran uporabom IQ modulatora. Kao zračeći element upotrijebljen je patch spregnut preko otvora s okomitim mikrotrakastim pobudnim linijama. Jedan od njegovih prolaza je iskorišten za prijam signala, a drugi za reemitiranje istog signala s fazom i pojačanjem odabranim u kontrolnoj jedinici amplitude i faze. Kontrola snopa može se također dobiti pomoću prekidačkog sklopa. Laboratorijska iskustva s 1-bitnim reflektorskim nizom s 4 × 4 elementa pokazuje preformance kontrole snopa, a također je prikazano i istraživanje na pojednostavljenju proizvodnog procesa 3-bitnog reflektorskog niza
