BLE antenna easy to ignore the little knowledge

BLE antenna also Layout several times, but each time is according to the antenna datasheet to the reference design layout, for the antenna is not much understanding, after all, there is no professional learning antenna.

There are two commonly used BLE antennas:

1. On-board antenna, is commonly used inverted F antenna, but the space requirements of the Board is relatively high, need a larger area to Layout, but the advantage is cheap

2. Ceramic patch antenna, basically is good according to datasheet to Layout, finally need to debug frequency point or impedance matching, the onboard antenna of course also need final debugging

Consistent with the ceramic patch antenna, write it here.

General Ceramic patch antenna datasheet give the reference design is very complete, according to it Layout finished basic will not have any big problem, as long as the late to adjust the impedance matching is good, but the recent month to a TDK antenna, it not only need to debug impedance matching, but also need FM point. Its reference design in addition to the clearance area and the auxiliary copper way, next to give a parameter PCB size, that is, the size of the PCB, it is explained that if the PCB size difference too much, this antenna reference design may not apply.

I have never noticed here before, but fortunately before the layout of the board size is not much with the PCB size difference. But there is a customer to do a very small board, ask me how to solve this problem, I really do not understand here, asked the original, the original gave me this antenna of another model, is applicable to a smaller size of the PCB, and also gave the proposal, is the headroom area larger the better, but certainly not big to no side, is in a certain range, the bigger the better, after all, the board is not very big.

Here to share, to remind you not to notice the friends here, also alert yourself, make a record.

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BLE antenna easy to ignore the little knowledge