Product Selection Guide
- By Product series
Applications
News
- 2025.06.09"What are decibels?" article has been uploaded to the RF Design Guide page
- 2025.03.28"How radios can create IoT networks" article has been uploaded to the RF Design Guide page
- 2025.02.13"Can receiver performance predict communication range?" article has been uploaded to the RF Design Guide page
- 2024.09.04"Understanding receiver specifications" article has been uploaded to the RF Design Guide page
- 2024.04.11"Friis equation and antenna effective area" article has been uploaded to the RF Design Guide page
- 2024.02.27"Filters and radio system design" article has been uploaded to the RF Design Guide page
Resources
- Technical ToolsWave propagation calculation tool (for free-space and 2 wave model)
- Technical ToolsFresnel zone calculation tool
- Technical ToolsOkumura-Hata curve calculation tool
- Technical ToolsCreating a channel plan in order to avoid third-order intermodulation interference and the near-far problem tool
- Technical ToolsHeight pattern calculation tool
- Technical ToolsMutual conversion of decibel value and true value





![[ Video ] [ STD-302Z ] Testing the radio modules STD-302Z and LMD-401](https://www.cdt21.com/wp/wp-content/uploads/2025/01/STD302Z_Testboard.png)
![[ Video ] Antenna height pattern calculation tool](https://www.cdt21.com/wp/wp-content/uploads/2024/12/Antenna-height-calculation-tool.png)
![[ Video ] Fresnel zone calculation tool](https://www.cdt21.com/wp/wp-content/uploads/2024/10/Fresnel-zone-calculation-tool.png)