COMPACT DUAL BAND ANTENNA

摘要

The invention relates to a balanced dual band antenna comprising a plane microstrip part and a plane electrically conductive ground plane part arranged substantially parallel to each other. A resonator of the antenna exhibits a½-wavelength first resonance within the frequency interval 400-500 MHz and exhibits a ¾-wavelength second resonance within the frequency interval 800-1000MHz. Preferably, the microstrip part is formed by a printed circuit board with electrically conductive paths. The antenna may be adapted for example for a lower frequency of 444MHz and a higher frequency of 910MHz (GSM). Preferably, the antenna is provided with a protecting cover. The antenna may be used with an associated consumption meter adapted for wireless transmission of measured consumed quantity. The antenna according to the invention exhibits a high efficiency and it is generally insensitive to mounting positions close to a surface etc.