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STM32W reference design - components availability and alternatives?

Question asked by sdim on Mar 31, 2013

I 'm trying to build a board for a project and I want to use the STM32W for the wireless link.
On the STM32W application notes there is a reference design that looks easy to build, but I have problem to find some of the recommended components, such as the band pass filter (WE748-351-124) and the balun (WE748-421-245).
The multilayer PCB antenna AN0835 is also hard to find, I only found it on ebay on low quantity.

Can you suggest a supplier that has the above components available?
Can you suggest some alternatives?