Patent ID: 12230874

Reference numerals in the drawings:1—upper metal radiation structure,11—metal ring,12—metal branch,2—lower metal backplane,3—feeder,31—probe,4—connection point.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In order that the objects, aspects, and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to the appended drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting thereof.

Embodiment 1

As shown inFIG.1, a substrate-integrated circularly polarized electromagnetic radiation structure comprises an upper metal radiation structure1, a lower metal backplane2and a feeder3.

The upper metal radiation structure comprises a metal ring11, and two metal branches12disposed within the metal ring. The metal branches12are bent structured. The two metal branches12are rotational symmetric by 180 degrees relative to a feeder3center. The metal ring11is a rectangular ring structure.

As shown inFIG.3, a plurality of connection points4are provided between the upper metal radiation structure and the lower metal backplane. An intermediate dielectric substrate is provided between the upper metal radiation structure and the lower metal backplane. A via hole is provided on the intermediate layer substrate at a position corresponding to a connection point between the upper metal radiation structure and the lower metal backplane. The metal branch12is a bent structure bent by 90 degrees. The benefit of such a connection is that feed balancing, circular polarization and high gain can be achieved.

The part enclosed by the upper metal ring11is the main radiating part of the antenna, which can work independently or can radiate in multiple groups of arrays. The size of the upper metal radiation structure1is between 0.2 and 1.5 wavelengths of the lowest operating frequency of the antenna (e.g., between 1 mm and 7.5 mm for 60 GHz and 0.76 mm and 5.77 mm for 78 GHz).

The lower metal backplane2mainly functions as a reflection, and is wherein it includes an upper metal portion. Namely, the lower metal plate includes a portion where the upper metal portion (including the metal branch12and the metal ring11) is projected onto the lower metal backplane2. The circularly polarized wave can be divided into left-hand circular polarization and right-hand circular polarization according to the electric field direction division, for example, the left-hand circular polarization form of the circularly polarized antenna shown inFIG.1, and the right-hand circular polarization form shown inFIG.2. The two circularly polarized versions of the antenna are mirror symmetric.

Embodiment 2

The antenna may be a circularly polarized antenna. The upper metal radiation structure is a plurality of metal branches12with rotational symmetry. The outer side of the metal branch12may be provided with a surrounding structure, either a ring-shaped structure or a ring-shaped structure with a notch. The metal ring11has a basic feature of being located at the periphery of the two metal branches. The specific shape thereof has many forms, such as a discontinuous metal ring form (as shown inFIG.4(a)andFIG.4(b), opened on the metal ring11) and a multi-turn metal ring form (as shown inFIG.4(c)). In addition, in the case of a small-pitch array of antenna elements (as shown inFIG.5(a)), the metal rings11are adjacently connected.

Embodiment 3

The antennas may form an array. An array may include different rotation directions for transmitting and receiving, respectively.FIG.5shows a specific structure of an array. Two arrangements. One is a close array arrangement, as shown inFIG.5(a). The array spacing is small, and the top metal of adjacent units will be connected. The other is a sparse array arrangement, as shown inFIG.5(b). The array arrangement pitch is large and the top metal of adjacent units are not connected.

Embodiment 4

An antenna for radar detection may employ transmit-receive heteropolarization to combat multipath interference, as shown inFIG.6. The principle of anti-multipath interference is (taking the transmitting as left-hand circular polarization as an example) that the left-handed circularly polarized wave is emitted by the transmitting antenna of the radar, and the right-handed circularly polarized wave reflected by the measured object is received by the receiving antenna, while the second reflected wave changes back to the left-handed circularly polarized wave which the receiving antenna cannot receive. The energy of the wave reflected more than twice is already weak and has little effect on reception.

Embodiment 5

The feed of the antenna may be by direct connection or coupling of the probe. The probe31is realized by a metal via hole. The metal via hole is connected to one of the top metal branches12in a direct connection mode of the probe, as shown inFIG.7(a). The metal via is disconnected from both top metals in a probe-coupled feed mode, as shown inFIG.7(b).

The above mentioned are only preferred embodiments of the invention and not intended to limit the invention. Any modification, equivalent substitution and improvement made within the spirit and principles of the invention shall be covered by the protection of the invention.