RF Probe and Pigtail

Well, there are plenty of other connectors besides SMA jacks -- MMCX is not uncommon for 2.4GHz stuff. But I'm assuming you didn't want to put *any* connector on the PCB?

Unless you have more money than you know what to do with (in which case you can give, e.g., Cascade Microtech a call), you'll find yourself using just straight 50 ohm coax or FET probes. FET probes are meant more for troubleshooting, however, and this is really the core of your problem: At

2.4GHz, to get accurate *measurements*, you need a mechanically repeatable interface to the board for your signal and ground reference. After that, you need some amount of transmission line (preferably many tens of degrees at a minimum) to de-embed whatever your mechanical interface is... and you need to make yourself a a open/short/through/load (or similar) calibration board with the same amount of transmission line.

Now, if you're just after *relative* measurements (i.e., just trying to find resonances or maixmize return loss, etc.), you probably don't need any of this: Just solder down some short pigtail leads off of a coax cable to your board, and call it good.

---Joel