Hardware & Implementation

PCB Antenna

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A 2.4 GHz antenna etched directly onto the PCB, commonly used in BLE designs for cost and size optimization.

    


    
    
    

      Also known as:
      
      Trace Antenna
      
      Printed Antenna
      
    

    
  


  




  
  

    
PCB Antenna


A PCB antenna is a 2.4 GHz antenna implemented as a copper trace pattern etched directly onto the printed circuit board. It is the most cost-effective antenna solution for BLE products, adding zero BOM cost beyond the PCB itself. PCB antennas are widely used in beacons, sensors, wearables, and other size-constrained BLE devices.


Common PCB Antenna Types






Type
Size
Performance
Design Complexity






Inverted-F (IFA/PIFA)
10-15 mm
Good
Medium




Meandered monopole
8-12 mm
Good
Medium




Meandered dipole
15-25 mm
Better
Higher




Loop antenna
10-15 mm
Moderate
Low




Ceramic patch (hybrid)
5-8 mm
Good
Low






The Inverted-F Antenna (IFA) is the most popular choice for BLE products due to its compact size, reasonable bandwidth, and well-documented reference designs from chip vendors like Nordic and Espressif.


Design Considerations


PCB antenna performance depends heavily on layout:


    

  • Ground plane clearance: The antenna element requires a keep-out zone (typically 5-10 mm) free of copper pour on all PCB layers. Violating this clearance detunes the antenna and degrades RSSI
    • 

  • Board edge placement: Antennas perform best at the PCB edge, away from battery, LCD, and metal enclosure walls
    • 

  • Impedance matching: A pi-network (two capacitors + inductor) between the SoC RF output and antenna trace tunes the impedance to 50 ohms. Chip vendors provide reference matching networks
    • 

  • Enclosure effects: Plastic enclosures detune the antenna by 50-200 MHz. Production matching must be done with the final enclosure
    • 



PCB Antenna vs Chip Antenna






Parameter
PCB Antenna
Chip Antenna






BOM cost
$0 (part of PCB)
$0.10-0.50




PCB area
10-25 mm trace
2-5 mm component




Performance
Layout-dependent
More consistent




Design effort
RF expertise needed
Place-and-route




Ground clearance
Required
Required






When to Choose PCB Antenna


PCB antennas are ideal when cost is critical and PCB area is available (at least 10 mm edge clearance). For products with tight PCB constraints, metal enclosures, or limited RF expertise, a Chip Antenna or pre-certified Module with integrated antenna is safer. Reference designs from SoC vendors (Nordic, Espressif, TI) provide validated PCB antenna layouts that can be copied directly.

  

  

  
  
  




  
  
Related Terms

  

  

    
    Chip Antenna
    
  





  

  
  

  
  

  
  
  

    
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Frequently Asked Questions


  

    
    

      
      

        
Our glossary covers 90+ BLE technical terms organized by category. Each term includes a definition, related terms, and links to relevant chips and guides.