Abstract: A new modulation technique named near-field direct antenna modulation is introduced, which simplifies the integrated circuit and improves the communication security. Based on the technology, a near-field modulation on-chip antenna is designed, which can radiate a direction-dependent fashion information. In this technology, the radiated far-field signal is modulated by changes in the antenna near-field electromagnetic (EM) boundary conditions. The design in this paper uses the reflections with switches beside the main antenna to change the antenna characteristic. The state of switch can change the reflection characteristic and then many different antenna patern are archieved. Using CST EM simulation software and MATLAB software to simulate the far-field characteristic of the simplified near-field modulation on-chip antenna operating at 60GHz, it is proved that the near-field modulation on-chip antenna can modulate information and produce a secure communication link.