Circularly-Polarized Focused Microstrip Antenna Arrays

An enhanced circular polarization near‐field focused antenna array by director patches

“…It simplifies the antenna model and is applied extensively . The other method is based on maximum power transmission efficiency principle, which can be discussed earlier . It arranges the excitation distribution by maximizing the power transmission efficiency T array between an antenna array and a testing antenna.…”

“…[3][4][5][6][7][8][9] The other method is based on maximum power transmission efficiency principle, which can be discussed earlier. 11,12 It arranges the excitation distribution by maximizing the power transmission efficiency T array between an antenna array and a testing antenna. This technique takes coupling between elements into account and has advantage of flexibility and accuracy.…”

“…CP antenna can be used to reduce the disturbance of cloud and rain on radar systems, avoid polarization mismatch, and mitigate the multipath interference . Due to diverse applications, much effort has been put on the CP antenna arrays and most of the works have been concentrated on expanding the axial ratio (AR) bandwidth and increasing the gain, and there seems little effort on the designs of CP antenna arrays with focusing capabilities . Because the excitation distribution not only determines the near‐field focusing (NNF) properties but also affects the AR of the antenna array, it is very difficult to determine the excitation distribution of antenna array with both satisfactory focusing and AR performance.…”

A new design of microstrip antenna array for microwave power transmission

“…The optimization theory of transmission efficiency proposed in Ref. [13][14][15][16][17][18] could calculate the maximal PTE and the corresponding distribution of excitations directly, and the coupling between transmitting array and receiving array is included in this FI GU RE 1 Microwave power transmission arrays [Color figure can be viewed at wileyonlinelibrary.com] method. However, the coupling between transmitting elements is ignored in these works.…”

“…In this article, an improved method based on the optimization theory of transmission efficiency between arrays [13][14][15][16][17][18] is introduced to design the high transmission efficiency MPT array. Compared with the previous method, the constraint of the transmitting element arrangement that ensure the eigenvalue (PTE) be real is removed by defining the PTE different from previous works, and the coupling between transmitting elements is included completely.…”