| 摘要 |
An antenna (14, 15) for installation in a subsurface ground enclosure has an F-shaped radiating element (15) having a rectangular strip (15c) disposed on edge and two spaced apart bars (15a, 15b) disposed substantially perpendicular to the rectangular strip (15c) for connection to a first edge of a circuit board (31) and an L-shaped ground plane extension element (14) extending from a second edge (31b) of the circuit board (31) and then turning substantially perpendicular downward to provide a longer ground plane within a confined rectangular space. The antenna (14, 15) is dimensioned so as to be tuned to a resonant frequency in a range from 450 Mhz to 470 Mhz. |
