|Cascaded SAW board. 3dB pad coupling two 315MHz SAWs with shield mounting outline.|
The wide band response of a single filter from the datasheet is shown below.
A quick simple setup was used with both the 7L12 and the Si application with single A-B stack to scan the filter response. Neither device has enough dynamic range to scan the desired response range, however, it is a good sanity check and quick to do. Those results are shown below.
Measurements show a passband insertion loss of 7dBm. This aligns nicely with the datasheet insertion loss of 1.7dB for a single filter (2x for the cascade) with a 3dB coupling pad. The lower end peak at ~309MHz is 50dB down for a 2x cascade while the datasheet indicates -25dB for a single device. All of this tells me the devices are not interacting badly and pulling each other. In short, this is working quite well.