This paper presents an aperture coupled circularly polarized antenna element working in the 26GHz millimeter wave band. The antenna element is fed by four groups of coupling aperture, and composed of parasitic patch, primary patch, coupling apertures, feeding network and square equivalent shield cavity. To satisfy the demand of wide-angle scanning phased array antenna, the overall dimension of the antenna element is 0.5λ, λ refers to the wavelength at the center frequency. The four groups of coupling apertures are designed with the π-shape to implement miniaturization, moreover, eliminate the energy that coupled to the feed network below. The feeding network is a one-four power divider composed of cascaded one-two Wilkinson power dividers, and in form of stripline. The four output ports of the feed network successively provide signals with equal amplitude and phase difference of 90º to the coupling apertures to realize circularly polarization. The one-four divider feed network is arranged in the outer space of the π-shaped apertures, and completed in one layer of the multilayers PCB, which reduce the number of the layers and simplify the design of the PCB stack. This antenna is designed based on the technology of stacked multilayer dielectric substrates and AIP architecture. The RF chip mounted on the back surface of the multilayer board, and connect with the antenna that designed in the upper part of the multilayer board by the metallic via-holes. By adopting the multi-point feeding technology and π-shaped coupling aperture, the axial ratio of the circularly polarized antenna improved significantly. The simulated results show that the proposed antenna has good performance within the whole working bandwidth 24.25~27.5GHz with VSWR<1.15, AR<1dB, the average radiation efficiency exceeds 80%, and can be a promising candidate for millimeter-wave phased array antenna.

No abstract

No abstract

No abstract

For future 6G communication systems, higher millimeter wave frequency band are considered, especially E-band, which could be used in high-capacity mobile communication system in the integrated access and backhaul as well as airborne high speed communication. In this paper, the status of E-band high-capacity mobile communication system is reviewed. E-band communication system is mainly aimed at point-to-point applications. It adopts reflector antenna and mechanical scanning, with low integration and heavy weight. In order to further adapt to the application of high-capacity and high dynamic platform, it is necessary to improve the system architecture, RF antenna, modulation mode, tracking and aiming, etc. In this paper, trends of E-band high-capacity mobile communication system are proposed, including architecture, low cost phased array, high order modulation and demodulation, and spatial multiplexing. First, future E-band mobile communication system must adopt phased array to adapt to the high-speed and high dynamic environment. For the system architecture trend, analog-digital hybrid beamforming architecture should be used to achieve the balance between performance and cost. Multi-functional integrated chip and RF antenna integration technology are adopted to improve the integration of antennas, reduce the interconnection loss between RF and antennas, and ensure the signal consistency of the system. In terms of modulation mode, high-order modulation and demodulation should be adopted, such as 64QAM, 256QAM, for the air-to-air and air-to-ground channels. LOS-MIMO and other spatial multiplexing technologies are adopted to improve the system capacity further.