4results about How to "Electrical size reduction" patented technology

The invention discloses a broadband 1-bit reconfigurable circularly-polarized reflective array antenna based on a multi-resonant structure. The broadband 1-bit reconfigurable circularly-polarized reflective array antenna comprises a reconfigurable circularly-polarized reflective functional layer, a circularly-polarized horn antenna and an acrylic support. The reconfigurable circular polarization reflection function layer is formed by periodically arranging M * N circular polarization reflection array antenna units with the same structure according to the interval of 0.4125 lambda 0. The circularly polarized reflective array antenna unit is composed of a radiation layer and a direct current bias layer, the radiation layer comprises a circuit pattern designed based on a multi-resonant structure, a PIN diode, a radiation dielectric layer and a reflection bottom plate, and the direct current bias structure comprises a direct current bias dielectric layer and a direct current bias circuit. 1-bit regulation and control of unit reflection phases can be realized by controlling the on-off states of the four PIN diodes, a + / -60-degree beam scanning function can be realized by adjusting the state of each circularly polarized reflective array antenna unit, and the circularly polarized reflective array antenna can be applied to wireless communication and satellite communication systems.

The invention belongs to the technical field of polarization conversion metasurfaces, and particularly provides a high-frequency-selectivity reflective polarization conversion metasurface with fourth-order response, which is used for realizing a polarization converter with high polarization conversion rate. The half-wavelength micro-strip resonator is composed of a frequency selective surface (FSS) and a coupling layer, a coupled half-wavelength micro-strip resonator is composed of an L-shaped micro-strip line of a bottom metal layer and a through hole, response is expanded to a high order, the polarization conversion rate is increased, and the broadening bandwidth is increased; meanwhile, the middle metal layer introduces a polarization conversion zero point, thereby improving the frequency selection characteristics of the two sides of a transmission frequency band. Moreover, the polarization metasurface is rotationally symmetrical in structure, has a dual-polarization conversion characteristic, and has a relatively high application value in the aspect of electromagnetic wave polarization conversion.

The utility model discloses a kind of dual-frequency artificial magnetic conductor, the dual-frequency artificial magnetic conductor includes substrate, ground plane and radiation structure;Radiation structure includes multiple array arrangement sub-radiation unit;Sub-radiation unit includes multiple T-shaped openwork structure, arc T-shaped structure and center structure;Arc T-shaped structure is located in the center structure far from the center of sub-radiation unit side;Center structure includes the arc T-shaped subpart and circular subpart of connection arrangement;Arc T-shaped subpart includes the first edge of the center of sub-radiation unit side far from, arc T-shaped structure includes the second edge of the center of sub-radiation unit side close to;First edge is located in the second edge far from the center of sub-radiation unit side.The dual-frequency artificial magnetic conductor of the utility model has certain different polarization electromagnetic wave vertical incidence insensitivity and incidence electromagnetic wave different incidence angle insensitivity, can reduce the radiation of antenna to human body, improve the security of wearable device.