Date: 20/09/2011

Small size, low loss antenna couplers from ST for 3G n/ws

STMicroelectronics has unveiled two new chips for controlling antenna power in mainstream 3G wireless products. ST claims the new devices are more than 83% smaller than earlier components and improve energy efficiency to maximize battery life for always-on-the-go consumers and business users. ST's bidirectional devices measure the reflected power, to improve control and efficiency.

The CPL-WB-00D3 and DCPL-WB-00D3 are single- and dual-path antenna couplers intended for single- and dual-antenna systems. By also integrating attenuators on coupled and isolated ports, the antenna couplers simplify circuit design while saving cost and pc-board space.

The new devices have dimensions of 1.3 x 1.0mm compared with earlier 1.7 x 1.4mm devices. The smaller packaging frees extra pc-board space inside 3G devices. With low insertion losses, high directivity and a wide operating frequency range, the antenna couplers are compatible with all 3G network standards, from GSM/EDGE to WCDMA/TD-SCDMA.

Major features of CPL-WB-00D3 and DCPL-WB-00D3:
o 50-ohm nominal input / output impedance
o Operating frequency range: 824MHz to 2170MHz
o Less than 0.2dB insertion loss
o 34dB typical coupling factor
o 25dB typical directivity
o Dimensions:
o 1300 x 1000µm x 690µm (CPL-WB-00D3)
o 1670 x 1440µm x 650µm (DCPL-WB-00D3)

The CPL-WB-00D3 and DCPL-WB-00D3 are in volume production now, priced at $0.215 and $0.305 for 1000 units, respectively. Alternative pricing options may be available for higher quantities.