Following is the datasheet 9 page ~ @ LT5537,
The 1:4 input transformer can also be replaced with a narrow band discrete balun circuit using three components as shown in Figure 6.
Capacitors C11, C12 and inductor L1 form a tank circuit having a transformer-like function over a narrow bandwidth.
Table 2. Matching Network Component Values for 200MHz Center Frequency
Figure 6. Input Matching Network
How to caluculate the each component value, L1, C11,C12,R2 @ figure 6 ?
Input frequency is f = 400, 600, 800MHz, 1GHz.