yjung
Newbie level 4
Hello experts!
I am trying to build a simple rectenna system on a flexible board to turn on an LED.
I started off with ADS simulation, followed by PCB fabrication on conventional FR4 board.
Till here, everything worked fine and the LED turned on at 2~3 meters away from the transmitting antenna.
However, if I move the circuit to a flexible board (polyimide; 50um), the device has extremely poor performance. LED would only turn on at 10~20 cm away from the external antenna.
I am using a Johanson chip antenna (2500at44m0400e), murata capacitors and Skyworks silicon Schottky diodes.
Only thing I changed from the FR4 substrate is the RF trace width, which I calculated to match 50 ohm impedance (based on CPWG transmission line) on the new substrate.
Based on this, the trace width reduced from 330 um to 132 um.
Could you please recommend any solutions to this issue? Is the substrate too thin? should I try different capacitor values?
Thank you all in advance!
I am trying to build a simple rectenna system on a flexible board to turn on an LED.
I started off with ADS simulation, followed by PCB fabrication on conventional FR4 board.
Till here, everything worked fine and the LED turned on at 2~3 meters away from the transmitting antenna.
However, if I move the circuit to a flexible board (polyimide; 50um), the device has extremely poor performance. LED would only turn on at 10~20 cm away from the external antenna.
I am using a Johanson chip antenna (2500at44m0400e), murata capacitors and Skyworks silicon Schottky diodes.
Only thing I changed from the FR4 substrate is the RF trace width, which I calculated to match 50 ohm impedance (based on CPWG transmission line) on the new substrate.
Based on this, the trace width reduced from 330 um to 132 um.
Could you please recommend any solutions to this issue? Is the substrate too thin? should I try different capacitor values?
Thank you all in advance!