STMicroelectronics BALF-SPI-02D3 is an ultra miniature balun. The BALF-SPI-02D3 integrates matching network and harmonics filter. Matching impedance has been customized for the SPIRIT1 ST transceiver. The BALF-SPI-02D3 uses STMicroelectronics IPD technology on non-conductive glass substrate which optimize RF performance.