Several Antenna Studies Based On WHEMS Technology

The "14th Five-Year Plan" of our country proposes to focus on the new generation of information technology and accelerate the innovation and application of key core technologies.The new generation of communication technology has put forward new requirements for communication systems in new application environments.As the core and critical component of communication systems,antennas need new breakthroughs to adapt to these new requirements.The Wideband High-efficiency Electro-Magnetic Structure(WHEMS)antenna,which was first proposed in 1999 and has undergone nearly 20 years of development,has been widely applied due to its excellent performance.Based on the WHEMS antenna technology and theory,this paper proposes the following innovative achievements based on the new application requirements of wireless communication technology: the parasitic patch principle of WHEMS antennas,the allweather wideband WHEMS antenna design method,the wideband complementary gain design method,the orthogonal radiating choke,the method of dual-frequency beamwidth consistency,and the surface wave self-suppression method.Several antennas have been designed accordingly.The main innovative achievements of this paper are as follows:1.We have established an equivalent radiation model for a linear waveguide-based highefficiency millimeter-wave system(WHEMS)antenna and theoretically analyzed its broadband radiation and impedance characteristics.This provides a theoretical foundation for applications of WHEMS antennas,such as broadband high gain and dual-frequency beam consistency.Additionally,we proposed the principle of a parasitic patch for WHEMS antennas and conducted in-depth research on its patch antenna mode,waveguide mode,and hybrid mode,providing technical support for the broadband multimode design of WHEMS antennas.2.In response to the requirements for all-weather,high-reliability,low-cost,wide-bandwidth,and high-gain antennas for 6th generation mobile communication systems(especially for IoT and oceanic communication),we propose a design method for wideband antennas based on WHEMS with a three-dipole director and a W-shaped reflector structure that can be fully metalized.The antennas designed using this method have the characteristics of low common-mode current,high mechanical strength,and strong adaptability to weather conditions.Using this method,we have designed LTE directional antennas,all-weather oceanic directional antennas,and all-weather highperformance IoT directional antennas through aerodynamics and statics analysis.These antennas exhibit features such as full metalization,low wind resistance,high strength,low common-mode current interference,and broadband high gain.3.To meet the demand for continuous bandwidth exceeding 150% in wireless communications,we propose a wideband complementary gain antenna design method and an orthogonal radiating choke to overcome the problem of decreased broadside gain of the antenna due to reverse current cancellation and electromagnetic leakage.We have designed a compact wideband broadside linear polarized WHEMS antenna that achieves peak gains of 2.5 dBi to 8.2dBi within the range of 700 MHz to 6 GHz(158% relative bandwidth).4.To meet the need for double frequency beamwidth consistency in directional coverage applications for Wi-Fi6E,we propose a dual radiation aperture dual-frequency beamwidth consistency design method based on WHEMS antennas.Using this method,we designed a Wi-Fi dual-frequency beamwidth consistent directional WHEMS antenna,and experimental results have shown that the antenna achieves beamwidths of 66-71 degrees in the H-plane in the frequency range of 2.4 GHz to 2.5 GHz and 4.9 GHz to 5.9 GHz,overcoming the problem of single antenna dual-frequency coverage in the deployment of sectorized Wi-Fi6E.5.Starting from the need to suppress surface waves in millimeter-wave wireless systems,a surface wave self-suppression method based on a radiating choke and a polarized metal wall was proposed.Using this method,a 60 GHz surface wave self-suppression WHEMS antenna-inpackage was designed,which effectively reduced noise interference and improved system sensitivity.