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You can choose any RF connector basically to this design. The challenge is in the layout. This is what AI suggest to do: Practical PCB Design Guidelines for SIM800C Impedance: 50 Ω Trace type: Most commonly microstrip (top layer with a solid ground plane directly underneath) Alternatively coplanar waveguide with ground (CPWG) for better impedance control Ground plane: Continuous and unbroken ground plane beneath the RF trace No signal routing, splits, or voids under the antenna trace Trace length: Keep it as short and straight as possible Corners: Avoid 90° corners → use 45° bends or smooth curves Components: Reserve space for a π matching network (e.g. C–L–C or C–C–L) between the module and the antenna for fine tuning Via fencing: Place closely spaced ground vias along both sides of the RF trace (especially for CPWG) Example Trace Widths FR-4, εr ≈ 4.2–4.6 1.6 mm PCB, microstrip, ground plane directly underneath → ~3.0 mm width ≈ 50 Ω 0.8 mm PCB → ~1.5–1.7 mm ⚠️ The exact width depends on PCB thickness, dielectric constant, and copper thickness — always verify using an impedance calculator (e.g. Saturn PCB Toolkit, AppCAD). Antenna Notes The GSM antenna itself is 50 Ω SIM800C supports GSM 850 / 900 / 1800 / 1900 MHz, so the antenna and matching network must work over a wide bandwidth Regards, Markus Virtanen HW / Electronics Designer

Hi you totally misunderstood my question, I did not talk about "Not Connected" flag at all, read my question again. I'm trying to explain the problem again, this time refer to attached image to see what I'm talking about. Please refer to attached image, first i select rows in grid, then i press button "Fill in the pin name with the net name" GND is filled in Net name column, but "DIG 2" did not its empty, because it has space in it, ITS A BUG if Pin name has space in it Net name is not populated, there should be an update to change space to an underscore like "DIG 1" to "DIG_1"[Picture]

If you have any questions about the Components, please contact LCSC：https://www.lcsc.com/products, there will be a special staff to answer your questions. email add：support#lcsc.com

Please check out this tutorial:https://prodocs.easyeda.com/en/faq/pcb/#how-to-remove-a-loop