Antenna technology includes an antenna oscillator and a planar antenna. The antenna oscillator has a plate-like structure and includes a first resonance part and a second resonance part connected to the first resonance part. The first resonance part and the second resonance part are provided with a first resonance window and a second resonance window, respectively. The first resonance window and the second resonance window have different effective sizes and the antenna oscillator is further provided with a connecting slit.