Abstract
A novel thinned array with symmetric distribution along the array center is proposed in this paper. The proposed symmetric thinned array is based on the theory of unequally spaced array and the amplitude of each element in the array can be changed by introducing the weighted function. The pattern of the proposed array can be properly adjusted by changing the weighted function and the amplitude of the weighted factor, which obviously releases new degrees of freedom in array design. It has advantages such as low side lobe level (SLL) in the visible region, no grating lobes, and low nearby side lobe level (NSL), which has good potential for wide-angle scanning. Both simulation and experiment have been done; the experiment results show that, by applying this novel symmetric thinned array with pattern reconfigurable quasi-Yagi antenna, the scanning range of the array is −70°~70° inH-plane with SLL almost −10 dB below the maximum of the main beam. The 3 dB beam-width coverage is −86°~86°, which means that the proposed array can realize the entire upper-space beam coverage and restrain the SLL at the same time.
Highlights
Phased array has received abundant applications in wireless communication and radar system in recent years due to its advantages such as high reliability, rapid speed, and high accuracy of beam scanning
According to the antenna theory, a microstrip phased array can scan its main beam from −50∘ to 50∘ with the array gain reduction of 4-5 dB down from its maximum because of the limitation of radiation pattern of array element and mutual coupling between elements, which will have huge influence on the radiation pattern when the scanning angle is large [2, 3]
A stable wide beam width in both E and H planes can be realized by using gaps and stubs-loaded patch in microstrip antenna [5]
Summary
Phased array has received abundant applications in wireless communication and radar system in recent years due to its advantages such as high reliability, rapid speed, and high accuracy of beam scanning. According to the antenna theory, a microstrip phased array can scan its main beam from −50∘ to 50∘ with the array gain reduction of 4-5 dB down from its maximum because of the limitation of radiation pattern of array element and mutual coupling between elements, which will have huge influence on the radiation pattern when the scanning angle is large [2, 3]. By properly adjusting the weighted function and weighted factor, the SLL can be suppressed By applying this novel symmetric thinned array with pattern reconfigurable quasi-Yagi antenna, the scanning range of the array is −70∘∼ 70∘ in H-plane with SLL almost −10 dB below the maximum of the main beam. The simulation results agree well with the experiment results, which shows the validation of the proposed method in wide-angle scanning array design
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