Abstract
Design of antenna array under the limitation of restricted size is a challenging problem. Cavity-backed slot antenna is widely used because of its advantages of small size, wide band, and wide beam. In this paper, a design of wide band and wide beam cavity-backed slot antenna array with the slant polarization is proposed. To obtain wide band and wide beam with limited size, the inverted microstrip-fed cavity-backed slot antenna (IMF-CBSA) is adopted as the element of 1 × 4 antenna array. The slant polarized antennas and their feeding networks are adopted because of their simple structures. The performance of the proposed antenna array is verified by the simulations and experiments. The measured VSWR < 2 bandwidth is 55% at the center frequency 21.8 GHz, and the gain is larger than 12.2 dB. Experimental results demonstrate that the proposed design achieves wide band and beam with the size of 68 mm × 56 mm × 14.5 mm.
Highlights
Slot antennas have advantages of low-profile, light weight, and ease of integration [1, 2]
The cavity-backed slot antenna (CBSA), where the slot is backed with rectangular cavity, achieves unidirectional radiation [3,4,5]
The CBSA can be fed by probe [5], metal waveguide, substrate integrated waveguide (SIW) [6], and microstrip [7, 8]
Summary
Slot antennas have advantages of low-profile, light weight, and ease of integration [1, 2]. The cavity-backed slot antenna (CBSA), where the slot is backed with rectangular cavity, achieves unidirectional radiation [3,4,5]. The CBSA can be fed by probe [5], metal waveguide, substrate integrated waveguide (SIW) [6], and microstrip [7, 8]. With the use of printed circuit board, the structure of the SIW and microstrip is simpler than the probe and metal waveguide. The size of microstrip is smaller than the SIW. The microstripfed CBSA (MF-CBSA) has simple structure and small size
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