Multi-Mode Yagi Uda Patch Array Antenna With Non-Linear Inter-Parasitic Element Spacing

A low-profile and broad steerable patch array antenna is presented. The improvement of the multi-directional functions from broadside very limited for antenna. In this work, number directional beams enhanced by 40% using a novel approach, inter-parasitic element expansion technique adopted only four PIN diode switches. Results in simulation measurement have verified that parasitic capable -of generating seven beam patterns directed towards −52°, −30°, −10°, 0°, +10°, +30°, +52° at xz-plane. Applying spacing’s optimization minimizing switching circuitry RF diodes on elements contributed to gain achievement more than 7 dBi.