A novel suspended stripline-fed printed square slot array antenna with high-gain

Abstract

A novel suspended stripline-fed square slot array antenna with high gain is presented. Its basic structure is a suspended stripline comprising of three layers. On the top layer, 4 3 4 square slots are etched and act as radiation elements. The middle layer consists of a suspended stripline power divider, and the bottom layer is a metal ground. After optimization by a parallel Genetic Algorithm (GA) on a cluster system, a prototype antenna is fabricated and tested. The measured results agree well with the simulated data, and show a high gain of 18.7 dBi and an impedance bandwidth of 5.7% for S11<-10 dB are obtained.

High-gain planar array designed by using fragmented slots

“…It is worth noting that the gain of the proposed slot array antenna has been considerably improved by the utilization of the fragmented slots. Table gives the comparison with the two slot array antennas in our previous works , the proposed antenna has improved the gain from 18.7 and 19.6 dBi, respectively to 20.5 dBi, and thus enhanced the corresponding aperture efficiency from 77% and 92%, respectively to 95%. The three antennas have the same number of slots and the same structure except for the slots' configuration, so the improvement of the gain should owe to the employment of the fragmented slot.…”

“…The possible value ranges of the unknown parameters must be determined prior to the implementation of the GA optimization. By making reference to our previous researches , the slots' width and length and should ∼0.5 at the resonance, where is the guided wavelength at the working frequency =5.8 GHz and is calculated by , in which is the free‐space wavelength, is the velocity of light in free space; to yield a good compromise among the side‐lobe level, antenna gain and aperture efficiency, the edge‐to‐edge distances between two neighboring slots and should be about 0.5 ; the parameters usually range from 0.02 and 0.15 ; the horizontal and upper margins and should range from 0.1 to 0.3 to leave enough upper and horizontal margins for the feed lines.…”

“…Some planar printed antennas use slots as their radiation elements. In our previous works , two planar printed slot array antennas have been devised. Both of them consist of 4 × 4 slots as their radiation elements, work at 5.8 GHz and are optimized by the Genetic Algorithm (GA).…”

“…Both of them consist of 4 × 4 slots as their radiation elements, work at 5.8 GHz and are optimized by the Genetic Algorithm (GA). One utilizes rectangular slots and achieves a gain of 18.7 dBi. Another employs a metamaterial structure, the periodic split‐ring resonator (SRR), to design its slots, and obtains a gain of 19.6 dBi.…”