Wireless connectivity is essential in modern electronics — but designing the radio circuit from scratch carries high RF engineering costs and lengthy certification timelines. This guide covers the seven major wireless standards, key module manufacturers, the pre-certified module certification shortcut, eight selection criteria, and PCB design considerations that determine real-world performance.
This guide covers the seven major wireless standards and their trade-offs (POINT 01), major module manufacturers by category (POINT 02), the pre-certified module certification benefit (POINT 03), eight module selection criteria (POINT 04), and PCB design rules that determine wireless performance (POINT 05).
No single wireless standard dominates all IoT and connected device applications. Each standard occupies a different position in the range-versus-power-versus-bandwidth space. The right choice depends on your application's specific requirements — not on what other products in your category happen to use.
| Property | Wi-Fi | BLE 5.x | LTE-M | NB-IoT | LoRa | Zigbee/Thread |
|---|---|---|---|---|---|---|
| Typical range | 50–150m | 10–400m | National | National | 2–50km | 10–100m mesh |
| Data rate | 10–1000 Mbps | 1–2 Mbps | ~1 Mbps | ~250 kbps | 0.3–50 kbps | ~250 kbps |
| Active TX current | 150–300 mA | 3–15 mA | 50–200 mA | 20–120 mA | 25–40 mA | 5–30 mA |
| Sleep current | ~1 mA | <2 µA | <5 µA (PSM) | <3 µA (PSM) | <1 µA | <1 µA |
| Infrastructure needed | Wi-Fi AP | None (direct) | Carrier network | Carrier network | LoRaWAN gateway | Coordinator |
The single largest procurement argument for using a wireless module rather than designing the radio circuit directly is the impact on regulatory certification. Developing an RF circuit in-house and certifying it is a specialised, expensive, and time-consuming process. Using a pre-certified module removes the radio transmitter from your certification scope.
Wireless module selection involves trade-offs across eight dimensions. Optimising any single criterion without considering the others is a reliable path to a design that fails in production, certification, or the field.
Wireless module performance in the final product is heavily dependent on the PCB layout — specifically the ground plane geometry, antenna placement, power supply decoupling, and EMC isolation from the rest of the circuit. These are decisions made at board layout stage that cannot be corrected without a PCB revision.
Wireless module selection drives development timeline, certification cost, power budget, and product lifecycle in ways that are difficult to change after the design is committed. Match the wireless standard to your range-power-bandwidth requirements before evaluating specific modules. Verify pre-certification coverage for every target market. Evaluate SDK quality with a working prototype before design-in. Follow the manufacturer's reference PCB layout precisely — especially antenna placement and ground plane geometry. A wireless module selected correctly at the beginning of a design project compresses time-to-market. A module selected incorrectly requires a hardware revision after regulatory testing — one of the most expensive corrections in electronics product development.
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Denro Keikaku is a cross-border electronics procurement specialist and direct partner of Chengde Technology. We support PCB sourcing for IoT, wireless, and connected hardware — from prototype through volume production.