Beam scannable microstrip patch antenna

A comparative performance analysis of SRR embedded ferrite superstrate patch antennas

“…A superstrate layer based on two ferrite rods similar to the one in [12] has been used to scan the main beam of the MPA. A schematic of the antenna with the superstrate layer is shown in Fig.…”

“…1. Based on the optimized design parameters derived in [12], a cavity height (h) of 16 mm gives a beam scan of ±30° based on the external DC biasing field H01 and H02 values. Considering the height of ferrite (h_f) is 20mm, the overall thickness of the antenna structure sums up to 36mm from the MPA aperture to the top of the ferrite superstrate.…”

“…Beam scan for the single MPA is achieved by producing a phase taper in the dominant component (y-component in this case) of the radiated E-field [12]. By embedding SRR structure on the ferrite rods of Fig.…”

“…3(c) it can be observed that for no SRR and Case 1, the phase changes smoothly until just before resonance, where the increase becomes steep. This region, before resonance, was used to produce phase change that resulted in a phase taper for beam scan in [12]. For Case 3, however, a sudden jump in phase is observed at a lower biasing of 0.1332T.…”

“…In literature, ferrites have been used for pattern shaping [9], reducing antenna dimensions for a given operating frequency [10] and to introduce frequency tuning [11]. A ferrite superstrate based MPA design presented in [12] shows an externally tunable beam scan of ±30° when DC biasing is varied between 0 and 0.219T. This paper presents the performance comparison of two split-ring resonator (SRR) embedded ferrite rod superstrate based single MPAs where the antenna profile has been considerably reduced while providing significant beam scans at much lower biasing levels as compared to the design of [12].…”