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Original question:

CC1310: Antenna design on TIDA-00484 Humidity & Temp Sensor Node for Sub-1GHz Star Networks Enabling 10+ Year Coin Cell Battery...

CC1310: Antenna design on TIDA-00484 Humidity & Temp Sensor Node for Sub-1GHz Star Networks Enabling 10+ Year Coin Cell Battery Life

Rustem Avkhadiev
Genius 3550 points
Part Number: CC1310
Other Parts Discussed in Thread: CC-ANTENNA-DK2

Hello!

What the difference between this 2 antennas, then used on 868 MHz?:

Version of #6 in www.ti.com/.../swra496a.pdf and http://www.ti.com/lit/an/swra416/swra416.pdf

Last one is 10% smaller, if it's no difference, i will use it.

  • 0
    TI__Mastermind 33190 points
    Hi,

    The smaller (first) version of this helical antenna had to have antenna matching network to be in close proxmity of 868-915 MHz. When the antenna was increased in size on the CC-Antenna-DK2, then the natural resonance of the antenna was not as reliant on the antenna match network. Figure 28 in SWRA296A shows the natural resonance with just a 0 ohm resistance.

    I would copy the larger antenna version and add a pi-network for antenna matching purposes. The exact resonance of the antenna will be dependent on the GND plane size, surroundings such as casing, batteries etc. Hence, the reason to include the antenna matching network.

    Regards,
    Richard
  • 0 in reply to RGW
    Genius 3550 points
    Thank you for a quick answer!