Dear all,
I am building up a radio harvesting circuit on WIFI signal, but I fail. Actually I am very new to antenna and RF aspects.I have several questions about the circuit.
First of all, I follow this schematic diagram from this article - http://www.hindawi.com/journals/apec/2010/591640/
Equipment that I have used:
6X 1N5819 DO-41 1A/40V diodes
17X 1pf ceramic capacitors
5X 0.1uH 0307 Axial-Lead Inductor
1X 2DBI 2.4-2.5GHz wifi pcb internal ipex antenna , like this:
1X UNI-T UT33C DMM
C1 is made up of 11X 1pf capacitor in series.
L1 is made up of 5x 0.1uH inductor in parallel.
C2=C3=C4=C5=C6=C7=1pf capacitor
The result I have encountered:
When I place the antenna vary the distance between 1cm to 3meters in any direction from my home wifi router, zero volt across Test point 3 with ground point , even zero volt test point 1,2 with ground point measured by the DMM.
I doubt at some area that I may misunderstand:
1. What is MS in the schematic diagram that illustrated in the research ?
2. Do I use wrong type of capacitor or diode or inductors? Since I have found some capacitors, inductors and diodes that specifically used in RF.
3. Do I need earth the antenna ? Actually, the ground point of antenna I have connected to the earth poin that near to C7 which is also connected to DMM negative(COM) pin. And I just follow this IPEX instruction:
4. Is the antenna too weak ? Since I have only 2DBI gain of antenna, however, I wonder why I even can not get 0.1mV when I place the antenna very very close to the home wifi router.
Apart from this, a very strange phenomenon occur in this circuit:
When I change the diodes to 1N4004 and keep other equipment unchanged, and placing the antenna near to a charging mobile phone or wifi router (on top of the device), there is a reading, like 30-50 mV shown in DMM.
I wonder is this reading due to the AC charging current?
I hope someone can help me.
Thanks all
I am building up a radio harvesting circuit on WIFI signal, but I fail. Actually I am very new to antenna and RF aspects.I have several questions about the circuit.
First of all, I follow this schematic diagram from this article - http://www.hindawi.com/journals/apec/2010/591640/
Equipment that I have used:
6X 1N5819 DO-41 1A/40V diodes
17X 1pf ceramic capacitors
5X 0.1uH 0307 Axial-Lead Inductor
1X 2DBI 2.4-2.5GHz wifi pcb internal ipex antenna , like this:
1X UNI-T UT33C DMM
C1 is made up of 11X 1pf capacitor in series.
L1 is made up of 5x 0.1uH inductor in parallel.
C2=C3=C4=C5=C6=C7=1pf capacitor
The result I have encountered:
When I place the antenna vary the distance between 1cm to 3meters in any direction from my home wifi router, zero volt across Test point 3 with ground point , even zero volt test point 1,2 with ground point measured by the DMM.
I doubt at some area that I may misunderstand:
1. What is MS in the schematic diagram that illustrated in the research ?
2. Do I use wrong type of capacitor or diode or inductors? Since I have found some capacitors, inductors and diodes that specifically used in RF.
3. Do I need earth the antenna ? Actually, the ground point of antenna I have connected to the earth poin that near to C7 which is also connected to DMM negative(COM) pin. And I just follow this IPEX instruction:
4. Is the antenna too weak ? Since I have only 2DBI gain of antenna, however, I wonder why I even can not get 0.1mV when I place the antenna very very close to the home wifi router.
Apart from this, a very strange phenomenon occur in this circuit:
When I change the diodes to 1N4004 and keep other equipment unchanged, and placing the antenna near to a charging mobile phone or wifi router (on top of the device), there is a reading, like 30-50 mV shown in DMM.
I wonder is this reading due to the AC charging current?
I hope someone can help me.
Thanks all
Last edited: