Recently, some frequency bands have been assigned to upcoming applications to guarantee the Broadband Wireless Access (BWA) together with traditional cellular and Local Area Network (LAN) services. Among them, the frequency band from 2500MHz to 2690MHz has been assigned to 3G mobile UMTS (Universal Mobile Telecommunications System) as an expansion band of the 1920-2170 MHz UMTS band. Moreover, the frequency band from 2300MHz to 2700MHz is reserved to WiMAX(TM) applications in some areas of the north and south America and in the all Asia. The newest installations of base station antennas have to afford the need to provide the area coverage for all these services and in this context it is preferable to avoid using one antenna for each system. For multi-service systems, wideband or multi-band antennas are needed when the lack of space is a determinant constraint. Actual radiating systems provide multi-band operability for GSM and UMTS cellular services, with a maximum percentage bandwidth up to 25% [1]. In addition to the multi-band element need, the antenna system is often requested to provide dual polarization capability [2]. This is necessary to implement diversity at the base station, to compensate for the signal degradation due to multipath phenomena [3]. © 2010 IEEE.
A wideband linear array of slot-coupled stacked-patches
Nepa P;Manara G
2010
Abstract
Recently, some frequency bands have been assigned to upcoming applications to guarantee the Broadband Wireless Access (BWA) together with traditional cellular and Local Area Network (LAN) services. Among them, the frequency band from 2500MHz to 2690MHz has been assigned to 3G mobile UMTS (Universal Mobile Telecommunications System) as an expansion band of the 1920-2170 MHz UMTS band. Moreover, the frequency band from 2300MHz to 2700MHz is reserved to WiMAX(TM) applications in some areas of the north and south America and in the all Asia. The newest installations of base station antennas have to afford the need to provide the area coverage for all these services and in this context it is preferable to avoid using one antenna for each system. For multi-service systems, wideband or multi-band antennas are needed when the lack of space is a determinant constraint. Actual radiating systems provide multi-band operability for GSM and UMTS cellular services, with a maximum percentage bandwidth up to 25% [1]. In addition to the multi-band element need, the antenna system is often requested to provide dual polarization capability [2]. This is necessary to implement diversity at the base station, to compensate for the signal degradation due to multipath phenomena [3]. © 2010 IEEE.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
