hamed8419215
Member level 5
hi.
i am using RFM22B-433-D (an RF module base on SI4432-revB1 that operate in 433MHz band and has DIP package).
DIP package of RFM22B has a little ground plane (with respect to SMD packages). and under some of the components, there is not any ground plane.
and also my circuit PCB has not a good ground plane.
i tested some type of antenna but i didn't get good results. in best situation, i got an RSSI about -3dBm on receiver side (my BEST result).
This result was obtained when the transmitter and receiver circuits were located at a distance less than 2 m and the transmitter output power was 100 mW.
i have about 7cm space for antenna and i don't know how to make a good antenna.
Any help is appreciated.
i am using RFM22B-433-D (an RF module base on SI4432-revB1 that operate in 433MHz band and has DIP package).
DIP package of RFM22B has a little ground plane (with respect to SMD packages). and under some of the components, there is not any ground plane.
and also my circuit PCB has not a good ground plane.
i tested some type of antenna but i didn't get good results. in best situation, i got an RSSI about -3dBm on receiver side (my BEST result).
This result was obtained when the transmitter and receiver circuits were located at a distance less than 2 m and the transmitter output power was 100 mW.
i have about 7cm space for antenna and i don't know how to make a good antenna.
Any help is appreciated.