Enable cellular, WLAN, Bluetooth & sat nav on one antenna

12th September 2014
Posted By : Nat Bowers
Enable cellular, WLAN, Bluetooth & sat nav on one antenna

Preventing harmonic effects from impairing GPS performance in smartphones, the R159 and D5107 FEMs have been unveiled by TDK. Claimed to be best-in-class extractors, the devices enable the coexistence of cellular, WLAN, Bluetooth and satellite navigation services on one antenna.

The R159 and D5107 FEMs are suited for extractors for satellite navigation signals on shared diversity and dedicated GPS antennas in smartphones.

A fully integrated front-end solution, the R159 enables the cellular receiver to share the cellular diversity antenna with the receiver for GPS and GLONASS (1575-1605MHz). The FEM combines an LNA and a low-loss SAW extractor in a 2.5x2.5x0.8 mm package and requires no further external components.

Supporting the full coexistence of cellular services with GPS, GLONASS and BeiDou, the D5107 can prevent interference from the harmonics of the lowband cellular signal at around 830MHz and the intermodulation products of the WLAN signal at 2400-2483MHz. According to TDK, the FEM combines a best-in-class SAW bandpass filter for GPS, GLONASS and BeiDou, matching and linearity enhancing circuits, and an LNA with a very low noise figure and supply current. Measuring 2.5x2.5x0.8mm, the package is covered with a metal plating to protect the GPS receive path from interference by spurious signals (received via air interface) into the GPS receiver chain. The D5107 has full shielding and is, therefore, able to offer optimum sensitivity of the GPS receive path to signals that are at thermal noise level.

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