Abstract
In this paper, a compact, wideband, and high-efficiency substrate integrated waveguide (SIW) feeding cavity-backed aperture-coupled magneto-electric (ME) dipole antenna element and its array are proposed. Firstly, an SIW cavity-backed and a modified bowtie dipole are designed for the antenna element which makes it possess a high gain and wide impedance bandwidth. The antenna element covers an impedance bandwidth of 66.3% from 10.7 to 21.3 GHz with a peak gain of 10.3 dBi. Secondly, a 4 × 4 array is designed using the proposed antenna element. And a full-corporate substrate integrated waveguide feeding network is introduced to excite the array elements for the antenna application with wide bandwidth and high efficiency. For validation, a prototype of 4 × 4 array is fabricated by standard printed circuit board (PCB) facilities and further measured. The measured −10 dB impedance bandwidth of the proposed 4 × 4 antenna array is 30% (12.75–17.25 GHz) with its gain being 18.2–20.9 dBi within the entire band. The measured maximum aperture efficiency of the antenna array is 94% at 14.92 GHz. Notably, the measured results agree well with simulations, and it shows great advantages over other similar antennas on efficiency and bandwidth.
Highlights
In recent years, radar systems have received widespread attention for their ability to detect, identify, and monitor a variety of targets
E antenna arrays always include a number of antenna elements, and the performance of the antenna element is especially important for antenna arrays. erefore, a great interest has been addressed to the design of wideband and high-gain antenna element
A wideband unidirectional antenna, which is commonly known as magneto-electric (ME) dipole antenna, was proposed in [6]. e antenna using the theory of complementary antenna which has advantages of wide bandwidth and stable unidirectional radiation patterns with low cross-polarization and low back radiation
Summary
Radar systems have received widespread attention for their ability to detect, identify, and monitor a variety of targets. Microstrip patch or slot antenna has been widely studied and applied in many radar or communication systems due to many advantages like its light weight, low profile, low cost, and ease of integration [2] It usually suffers from narrow impedance bandwidth or unstable radiation patterns within the operating bandwidth. Several improved designs for enhancing its impedance bandwidth and gain have been proposed [7,8,9,10,11,12,13]; the methods mainly include loading parasitic patches, increasing open slots, or using EBG style [7,8,9,10] These antennas can achieve a wider bandwidth, their structures are large and complicated, and the metal manufacturing process
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