I was wondering would it be possible to use a 50 ohm IC Antenna (like this one) for the nRF51822 with the matching circuit given for the nRF24 (link here)?
It seems like it should work but i am not an RF expert so wanted to throw it out there.
I was wondering would it be possible to use a 50 ohm IC Antenna (like this one) for the nRF51822 with the matching circuit given for the nRF24 (link here)?
It seems like it should work but i am not an RF expert so wanted to throw it out there.
You mentioned the impedance at the end of the matching circuit will be close to 50 Ohm for both nRF24 and nRF51822 reference designs. From a functional standpoint the two matching circuits are then interchangeable. HN: They are not. The impendance of the nRF24 and the nRF51822 could be different. The balun made for nRF24 is operating with nRF51822 only, if there is an aditional capacitor on the end of the balun. The matching circuit will transform the impedance of the IC and will filter some harmonic wavs as well.
A PCB antenna designed according to the nordic whitesheets will be 50 ohm if trace length is tuned correctly (via the procedure given). HN: It will be or it will maybe not. You get something with close to 50 Ohm and resonance in 2400 MHz band. Why you will not get what you want you will learn by reading here: www.gsm-modem.de/.../
Even though performance will vary with antenna size/position/type etc, different 50 ohm antennas are interchangeable under optimal zero interference situations with the same matching circuit. HN: There is no zero interference condition in real life. The parameters of the antennas are validated on reference PCB without enclosure only. By reading here: www.gsm-modem.de/.../ you wil learn which parameters will change and why. To learn further, you have to read a lot of book, to stay a longer time at university or to ask your local Field Application Engiineer Wireless or to hire a consulter with RF skills.
You device will radiate if you follow to guidelines of the manual. It will maybe not radiate perfect and offer less range. It will worst case radiate on other frequencies, because you try to copy a matching circuit from design A to design B.
You mentioned the impedance at the end of the matching circuit will be close to 50 Ohm for both nRF24 and nRF51822 reference designs. From a functional standpoint the two matching circuits are then interchangeable. HN: They are not. The impendance of the nRF24 and the nRF51822 could be different. The balun made for nRF24 is operating with nRF51822 only, if there is an aditional capacitor on the end of the balun. The matching circuit will transform the impedance of the IC and will filter some harmonic wavs as well.
A PCB antenna designed according to the nordic whitesheets will be 50 ohm if trace length is tuned correctly (via the procedure given). HN: It will be or it will maybe not. You get something with close to 50 Ohm and resonance in 2400 MHz band. Why you will not get what you want you will learn by reading here: www.gsm-modem.de/.../
Even though performance will vary with antenna size/position/type etc, different 50 ohm antennas are interchangeable under optimal zero interference situations with the same matching circuit. HN: There is no zero interference condition in real life. The parameters of the antennas are validated on reference PCB without enclosure only. By reading here: www.gsm-modem.de/.../ you wil learn which parameters will change and why. To learn further, you have to read a lot of book, to stay a longer time at university or to ask your local Field Application Engiineer Wireless or to hire a consulter with RF skills.
You device will radiate if you follow to guidelines of the manual. It will maybe not radiate perfect and offer less range. It will worst case radiate on other frequencies, because you try to copy a matching circuit from design A to design B.
