| 摘要 |
PURPOSE: A multi band non uniform helical antenna is provided to accomplish both resonance frequencies by varying parameters of the helical antennas including, for example, the pitch angle, coil diameter, length and number and spacing of the coil turns. CONSTITUTION: Non-uniform helical antennas are described for use in two or more frequency hyper bands. For example, non-uniform helical antennas can be designed according to the present invention for usage in portable terminals capable of operating both at 800 MHz and at 1900 MHz. |
