Xingang Ren、Yong Cai、Zhixiang Huang、Ming Fang、Guangshang Cheng、Kaikun Niu、Lixia Yang、Hao Ren、Jie Wu，Two-Element Broadband Antenna Device，荷兰授权号： 2029498，2023.03.23.

As for a common ultra-wideband antenna loading notch technology, due to the small size of the ultra-wideband antenna, one to two notches of the antenna are often tried on an antenna element to block the electromagnetic interference in the relevant frequency band. In addition, the common loading notch will introduce a new branch joint design, which will change the size of the common antenna and affect the matching effect of the antenna. In addition, the two-element antenna currently designed will interfere with each other due to the mutual coupling effect of current during operation. 

In order to solve the technical problem, the invention provides a two-element broadband antenna device which comprises a substrate, two cell patches are arranged on the substrate, and U25 shaped grooves for blocking electromagnetic interference are formed in the two cell patches.

According to the technical scheme, the U-shaped groove is adopted to block electromagnetic interference of relevant frequency bands, so that the problem that the size of an antenna is 30 changed due to the fact that a new branch joint is introduced by loading notch is avoided. 

Further: three U-shaped grooves are arranged. 

Further: the opposite side of the cell patch is provided with a chamfer.

Further: the ground plate is provided with a groove.

Further: the two cell patches are distributed orthogonally.

Further: the cell patch is made of FR4 sheet material having a relative dielectric constant of 4.4 and a loss chamfer of 0.02. 

Further: the surface of the cell patch is provided with an oxidation gold plating layer.

Further: two floor branches are arranged on the substrate, the two floor branches and the two cell patches are arranged in one-to-one correspondence, the length direction of the two floor branches is consistent with the length direction of the corresponding cell patches, and the two floor branches are used for isolating the two cell patches from each other.

Further: two independent ground elements are further arranged on the substrate, and the two cell patches and the corresponding floor branches are respectively connected to one ground element.

The technical effects and advantages of the invention are as follows: the structure of the invention is simple, the U-shaped groove device is added based on the advantage that the complementary split-ring resonator  (CSRR) can form obvious band resistance, the  lectromagnetic interference of relevant frequency bands is blocked, the loading of three notches can be realized through the arrangement of the three U-shaped grooves, and the problem that the size of an antenna is changed by introducing a new branch joint at present is avoided, and the impedance matching characteristic of the antenna is improved by introducing a groove design into a floor. According to the invention, the current mutu-al coupling is effectively improved by independent floor structures and loading floor branches, the isolation degree is improved and the isolation effect is further ensured to be better through orthogonal feeding arrangement of the two cell patches.