A Hadamard Matrix Feed Network for a Dual-Beam Forming Array Antenna

Compact hybrid CPW‐FED slot antenna array with pattern diversity

“…By appropriately processing the receiving signals, the performance of the system can be enhanced even in the interference impaired environments. In recent articles [3–7], several design strategies of the antennas with pattern diversity have been studied. One of the effective methods is the pattern reconfigurable antenna [3, 4].…”

“…In a study by Yang et al [6], the conical and broadside radiation patterns of a single patch antenna are excited by two different sets of L‐shaped probes. More sophisticated feed network proposed in [7] is a 4 × 4 Hadamard matrix feed network for switched radiation patterns of antenna array. The direction of the main lobe can be controlled by input ports.…”

“…However, the insertion loss and parasitic parameters of RF switches implemented in [3, 4] must be considered in the design. In addition, dual antennas [5] and feed network [6, 7] are not compact and occupy more space. It is difficult to achieve good performance in a space‐limited situation.…”

“…Slot antenna elements are chosen for their intrinsic wide bandwidth. CPW is adopted to provide out‐phase and in‐phase feed modes with high isolation [8, 9], which is more compact than the design in [6, 7]. Difference and sum radiation patterns are achieved in azimuth plane as pattern diversity, showing an extension of the slot array performed in Ref.…”