This work was supported in part by the Ministerio de Ciencia, Innovacion y Universidades under project TEC2017-86619-R (ARTEINE) and by the Gobierno del Principado de Asturias/FEDER under project GRUPIN-IDI/2018/000191.

/pdf/an-overview-on-synthesis-techniques-for-near-field-focused-4w9hafmr8w.pdf

An Overview on Synthesis Techniques for Near-Field Focused Antennas

/pdf/recent-wireless-power-transfer-technologies-3bjp451qeg.pdf

Recent Wireless Power Transfer Technologies

This work presents a review of the generalized intersection approach (GIA) for electromagnetic array antenna beam-shaping synthesis. After briefly describing the mechanics of the classical IA, we show the extensions to the IA that make the GIA a more powerful algorithm. In short, these improvements consist in working with the squared field magnitude to improve the convergence properties of the algorithm, and the use of a general minimization algorithm in the backward projection that allows to extend the scope of the optimizing variables beyond those directly related to the field at the aperture. Three optimization examples using the GIA are presented to showcase its capabilities for near and far field synthesis with a variety of arrays: transmitarray, aperiodic phased-array and reflectarray. Finally, we carry out a literature review of the IA, including its origin, different flavours, development, extensions and current and future use for antenna synthesis.

The Generalized Intersection Approach for Electromagnetic Array Antenna Beam-Shaping Synthesis: A Review

The invention discloses a millimeter-wave dual reflector antenna capable of focusing a near-field wave beam. The antenna comprises a main reflector, an auxiliary reflector and a feed source, wherein a wave beam emitted by the feed source is reflected by the auxiliary reflector to the main reflector, and then emitted; a curved surface of the main reflector is a revolution paraboloid; and a central point of the main reflector is located at an intersection point of an emitting central axis of the auxiliary reflector and an axis of a radiation wave beam. The antenna is simple in structure and mature to process; the power density of a near-field region axis of the antenna is improved; the maximum power density of the axis is improved greatly under the same input power; a distance range of an effective power threshold is expanded; the efficiency of the antenna is improved; and a near-field gain of the antenna is increased.

Millimeter-wave dual reflector antenna capable of focusing near-field wave beam

The invention discloses a compact field millimeter wave/infrared composite target device. A simulation device comprises a millimeter wave offset feed paraboloid, an infrared transmitting window, a millimeter wave horn antenna, an infrared radiation source and an infrared collimation optical system. An opening in the millimeter wave offset feed paraboloid serves as the infrared transmitting window. The millimeter wave horn antenna radiates plane waves approximate to the infinity through the reflection of the offset feed paraboloid. The infrared radiation source passes the infrared collimation optical system and then passes the infrared transmitting window, and accordingly infrared parallel light approximate to the infinity is formed. The millimeter wave plane waves formed in the position of a static area designed in the millimeter wave antenna through the above manner and the infrared parallel light formed at the position of an exit pupil designed in the infrared optical system through the above manner form coaxial composite signals. The millimeter wave infrared composite target of the compact field structure can accurately simulate the millimeter wave infrared composite signals in specific frequency bands and wave bands, a composite target is provided for a composite signal detector on a rotary table or a table top, and the space and cost are greatly saved.

Compact field millimeter wave/infrared composite target device

The invention discloses a millimeter wave double-reflecting-face antenna with near-field uniform wave beams. The millimeter wave double-reflecting-face antenna comprises a base seat, a main reflecting face, an auxiliary reflecting face and a corrugated horn feed source. The corrugated horn feed source is fixed on the base seat. The auxiliary reflecting face is fixed in front of the corrugated horn feed source. The main reflecting face is fixed on the back of the corrugated horn feed source. The millimeter wave double-reflecting-face antenna is characterized in that the central area of the main reflecting face is in an ellipsoid face shape similar to focus, the area, close to the outer edge, of the main reflecting face is in a corrugated fluctuating face shape composed of annular convex-concaves, the main reflecting face shape of the double-reflecting-face antenna is improved, millimeter wave beams radiated from a feed source horn go through reflection by the auxiliary reflecting face and the main reflecting face, special opening face phase distribution is formed, pen-shaped wave beams even in power density and wave beam radius are generated in the distance ranging from 1.2m to 4.0m in a near field, and shake is less than 10%. The millimeter wave double-reflecting-face antenna can be widely used in the field such as millimeter wave short-range communication, millimeter wave imaging and millimeter wave power wireless transmission.

Millimeter wave double-reflecting-face antenna with near-field uniform wave beams

The paper proposed a new method to synthesis circular aperture mm-wave antennas with contoured beam wave in near-field. With derivation on the near-field integral calculus formula of circular aperture antennas, we provided a novel algorithm to transform aperture distribution to axis distribution back and forth using fast Fourier transform(FFT) technology. Referring to the Phase-Only method widely used in far-field pattern synthesis, a method to synthesis circular aperture antennas with contoured near-field beam wave was given. To verify the proposed synthesis method, a circular reflector antenna with diameter of 1.2m and works at frequency of 95GHz was synthesized, an uniform beam wave with quasi-constant power density and beam radius at distance range from 25 m to 100 m was obtained in the near-field, the relative difference is below 10%. At last a reflector with diameter of 0.3m was designed and tested, the tested results is fit well with simulated results.

A novel synthesis method for millimeter-wave antenna with contoured-beam at near-field region

The invention discloses a variable-focus millimeter wave reflector antenna. The variable-focus millimeter wave reflector antenna comprises a base support. A main reflecting face is arranged at one end of the base support. An auxiliary reflecting face is arranged at the other end of the base support. A feed source is arranged at the end, provided with the main reflecting face, of the support. Electromagnetic waves fed out by the feed source are reflected to the main reflecting face through the auxiliary reflecting face. The auxiliary reflecting face is hollow, and a pressure interface is formed in the back of the auxiliary reflecting face and connected with a pressure control device through a pressure pipeline. The auxiliary reflecting face deforms through control over the pressure in the auxiliary reflecting face, different kinds of deformation are produced through different pressure values, and therefore the focal positions of the reflecting face can be changed. Compared with a traditional fixed-focus reflector antenna, the variable-focus millimeter wave reflector antenna can be more suitable for different using environments.

Variable-focus millimeter wave reflector antenna

The invention discloses a millimeter wave near-field mechanical focusing double-reflecting-surface antenna. The millimeter wave near-field mechanical focusing double-reflecting-surface antenna comprises a primary reflecting surface, a secondary reflecting surface and a feed source. Wave beams emitted by the feed source are reflected to the primary reflecting surface via the secondary reflecting surface and then emitted out. The secondary reflecting surface can move forward and backward, upward and downward and leftward and rightward or move rotatably or rotate on a movement mechanism. The shape of the curved surface of the primary reflecting surface is a rotary paraboloid. The central point of the primary reflecting surface is arranged at the intersection of the emergent central axis of the secondary surface and the axis of the radiation wave beams. The millimeter wave near-field mechanical focusing double-reflecting-surface antenna is simple in structure and mature in processing so that axis power density and operating distance range of the near-field region of the antenna are enhanced. Meanwhile, the position of the maximum power density can be simply and rapidly adjusted in a larger region, i.e. the maximum axis power density is greatly enhanced and the position can be adjusted in a large region under the situation of the same input power so that the range reaching the effective power threshold is enlarged.

Millimeter wave near-field mechanical focusing double-reflecting-surface antenna

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