Abstract
A single-layer waveguide slotted array antenna is proposed for W-band applications. To eliminate the alignment errors, all structures including the radiation slots, radiation waveguides, and power divider network are realized in one layer based on the milling process, and a planar metal plate is employed to cover the bottom. For example, an 8 × 9 array is designed with 1-to-8 power divider network to validate the proposed technology. The effective radiation aperture size of the array is 24 mm × 21 mm, and the height is only 8 mm. The measured reflection coefficient of the antenna is larger than 3 GHz for S11 < −10 dB. The peak gain is 25.9 dBi, and the corresponding antenna efficiency is about 65%. All cross-polarization of the antenna array is less than −35 dB. The proposed array antenna features a simple structure, low cost, and easy implementation for W-band applications.
Highlights
Antenna array is widely used in microwave engineering system, such as the microstrip antenna array, because of the high efficiency, simple structure, and low cost
When the frequency increases to millimeter-wave band, the microstrip antenna suffers from high dielectric loss and leakage loss which result in a low radiation efficiency [1,2,3]. e substrate-integrated waveguide (SIW) antenna is proposed for Ka-band and W-band applications [4,5,6,7,8,9]. e dielectric loss of the SIW antenna is acceptable at Ka-band [5]
Compared with SIW, the waveguide slotted array is an excellent candidate for millimeter wave antenna array as there is no dielectric loss
Summary
Antenna array is widely used in microwave engineering system, such as the microstrip antenna array, because of the high efficiency, simple structure, and low cost. When the frequency increases to millimeter-wave band, the microstrip antenna suffers from high dielectric loss and leakage loss which result in a low radiation efficiency [1,2,3]. Compared with SIW, the waveguide slotted array is an excellent candidate for millimeter wave antenna array as there is no dielectric loss. E radiation slots and feed waveguide are etched on two different plates and connected together by diffusing bounding for high precision assembling [11]. E electroforming process is proposed to fabricate the waveguide slotted array at W-band with very high radiation efficiency [12]. E power divider network, the radiation waveguides, and the radiation slots of the antenna are designed in a single layer, so the high fabrication precision can be achieved by milling process, and the assembly is very easy. All the 1-to-8 power divider network, 8 radiation waveguides, and 8 × 9 radiation
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