摘要： In order to improve channel capacity, waves carrying orbital angular momentum (OAM) in communication systems have attracted much attention. A two-OAM-mode antenna system, which works at 2.4 GHz, is proposed in this paper. And a signal transmission experiment is performed based on a pair of the proposed antenna systems. The proposed antenna system, which has the planar structure, is composed of two patch antenna arrays, two feeding networks and one common ground plane. Then, re?ection coef?cients, transmission coef?cients, radiation patterns and phase distributions of the proposed antenna system are measured and the measurement results verify the effectiveness of this antenna system in generating two OAM modes (OAM mode 1 and OAM mode 2). The measurement results are in good agreement with the simulation results. Then the signal transmission system is built based on a pair of the proposed antenna systems. Isolation between OAM mode 1 transceiver channel and OAM mode 2 transceiver channel is more than 20 dB. Video signals modulated by FBMC (Filter Bank Multicarrier) are de-modulated simultaneously at the receiving terminal. It means that the two-OAM-mode antenna system has the potential to enhance the channel capacity.