| 摘要 |
#CMT# #/CMT# The antenna has a polarization switching unit (SW 1) whose terminals are connected to zones (Z 1, Z 2). Polarization switching units (SW 2, SW n-1) have terminals connected to the zone (Z 1) and one of other additional zones (Z 3, Z n). The zones (Z 2, Z 3, Z n) are subjected to polarization potentials of respective units (SW 1, SW 2, SW n-1) to control switching states of the units. Each switching unit traverses a space forming slot. #CMT# : #/CMT# An independent claim is also included for a mobile communication terminal comprising an antenna. #CMT#USE : #/CMT# Used in a mobile communication terminal (claimed) e.g. mobile telephone of a global system for mobile communication (GSM) mobile telephony system, for transmission over a frequency band comprised between 880 and 960 MHz for GSM 900 system and over a frequency band comprised between 1710 and 1880 MHz for GSM 1800 or digital communication system (DCS), and for a universal mobile telecommunications system (UMTS) type telephony system and a reception part of a GSM 1900 system. #CMT#ADVANTAGE : #/CMT# The antenna permits to uncouple the adjustment of low resonant frequencies from the adjustment of high resonant frequencies. The antenna permits one of the zones to be separated and the spaces forming slot to be introduced, thus obtaining a high standing wave ratio in absolute value, of the order of -6 dB for the low frequencies and a moderately high value standing wave ratio in absolute value of the order of -5 dB for the high frequencies. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a multiband switchable antenna. AE2 : Multi-band switchable antenna PM : Ground plane Si 1-Si n-1 : Polarization potentials SW 1, SW 2, SW n-1 : Switching units Z 1, Z 2, Z 3, Z n : Zones. |
