Abstract
A new strategy for designing low side-lobe level (SLL) antenna array is presented. This strategy utilizes special arrangement of antenna elements rather than direct tapered excitation amplitude to obtain an equivalent desired amplitude distribution in the main planes and thus achieve low SLL and high gain concurrently. To illustrate the strategy, 9-element microstrip antennas are arranged in four manners. An equivalent analysis method is also proposed to predict the SLL of the arrays. Using this method, a fast analysis of the trend of a microstrip array for a low SLL can be performed and thus a proper array-element arrangement is acquired. Both numerical and experimental results demonstrate that the SLLs in E and H planes of the novel array are fairly low. Meanwhile, the main beam of the novel array is almost the same with that of a conventional high-gain array. The antenna arrangement manner and the proposed strategy are particularly suitable for applications when low SLL and high gain are both demanded.
Highlights
IntroductionThe radiation performance of antennas will directly affect the communication quality
Antennas are the key devices in wireless communication systems [1], [2]
NUMERICAL RESULTS AND ANALYSIS To verify the above design and analysis strategy of low side-lobe level (SLL), the four arrays shown in Fig. 1 are simulated numerically using HFSS
Summary
The radiation performance of antennas will directly affect the communication quality. Many excellent work has been done to design antennas with desired working bandwidth and radiation main beam [3]–[9]. With the improving requirement of more advanced performance, it becomes critical to reduce the side lobes of antennas. This is because high side-lobe level (SLL) will distribute the transmitted power and lead to the reception of unexpected noise from the direction away from the main beam in communication. Lots of practical applications have proved that antennas with low SLL are essential parts of many up-to-date communication and radar systems [10]–[12]
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