We are designing a custom PCB which uses a micro-controller with a single RF-out capable of doing 2.4G/5G/Bluetooth. This questions has 3 parts:
- Using the Chip Antenna on the physical Board
- Calculations for the transmission line between the chip antenna and Broadcomm Chip
- Using the single RF_out pin on the controller (Broadcomm WM-BAN-BM-13)
The antenna we are using is capable of doing both 2.4 Ghz and 5 Ghz, however the reference designs used with this particular chip only show a single feed line with a matching network going to it. Does this mean that the antenna can only operate in one of the two modes at a given time?
Additionally, the screenshot provided shows 2 different calculators used to design the attaching feed line. In the program to the left, it suggested a "Physical Length (L)" for the transmission line, from my understanding, this only pertains to the Frequency used for the feed signal and is used to help design the matching network with shunt capacitors and inductors if the line is less than that amount correct?
What would be the suggested way of using the calculated transmission line values and selecting the correct capacitor/inductor values for the desired length?
And lastly, if the BM chip only has 1 RF-out pin, how can a single transmission line for a single antenna be used for both 2.4 Ghz and 5 Ghz?