Series- and Corner-Fed Planar Microstrip Antenna Arrays

Abstract

Linear arrays along radiating (E-plane) and nonradiating (H-plane) edges are designed for broadside radiation pattern at 5.8 GHz using U-shaped series- and corner-feed configurations, respectively. U-shaped feedlines are used to reduce the interelement spacing and size of the array. A 25-element radiating edge linear array provides 19.9 dBi gain with sidelobe level (SLL) and cross polar (X-pol) level of less than −15.3 and −33.8 dB, respectively. Nonradiating edge linear array is designed up to 31 elements using the corner-feed configuration to achieve 18 dBi gain with SLL and X-pol level of less than −15.2 and −22.5 dB, respectively. Furthermore, a planar array is designed using the series and corner feeds in E- and H-planes. A $15 \times 15$ -element array is designed to achieve 24.4 dBi gain with SLL and X-pol level of less than −14.7 and −18.8 dB, respectively, in both the E- and H-planes. This array eliminates the need of complex-, multilayer-, and lossy-feed network and improves SLL and X-pol level. A planar array of $9 \times 9$ elements is fabricated, and the measured results are in agreement with the simulated results.