Patent ID: 9660346
Date: 2017-05-23
CPC Classifications: H01Q

Claim:
1. An antenna structure for receiving and sending a radio frequency signal, comprising: a connecting portion having a feeding point and a connecting point at opposite ends thereof; a grounding portion extending from the connecting point and having a grounding point at an end opposite to the connecting point; a first extending portion extending continuously from the connecting point to a first open terminal at an end opposite to the connecting point; and a second extending portion extending continuously from the connecting point to a second open terminal at an end opposite to the connecting point; wherein a first vector goes from the connecting point to the first open terminal, and a second vector goes from the connecting point to the second open terminal, such that an included angle larger than zero is formed between the first vector and the second vector; wherein a difference between a length of a first path defined between the feeding point and the first open terminal of the first extending portion and a length of a second path defined between the feeding point and the second open terminal of the second extending portion equals one-fourth or a positive integer multiple of a wavelength of the radio frequency signal such that electric currents respectively following the first and second paths have a phase difference of 90°, so as for the antenna structure to receive and send a circularly polarized radio frequency signal; and wherein the connecting portion, the grounding portion, the first extending portion, and the second extending portion are joined at the connecting point and extend in four different directions therefrom.