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[help] on a UHF TX schematic

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vale

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uhf tx 2004

Hi all,
Here is the Eval-kit schematic of MAX2903, a 868MHz TX. Some problems want answers:
1. Why use R15 connect to VCC?
2. Inside red box constitute a BPF:
L1/2 + C31/C32 -> HPF
C15/C16 + L3/L4 -> LPF
C33 + C34 + L5 -> BPF
Am I right? And what are design considerations on a filter following RFout?
3. Blue box is a balun. Why C21?
 

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