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Hello
I am using an "active port" simulation for a 4x1 conformal probe-fed antenna array. My question is: when we select the voltage source for each port (see the screenshot), it is 1 V for each port in my array. Then what is actually the input power of my total array ? For doing the active port simulation, see my other screenshot. Transmit power is by default 0.5Watt. what does it mean ? is it the input power of the array?
If I want to calculate input power of this array antenna then how to check this ?
"Active power" is the power delivered by the total (array) antennas, which is actually the power from 1. Voltage source … mentioned above.
If no additional loss, "Active power" is the same as "far-field power" = total radiated power. Please check it in POSTFEKO.
Best regards,
Jaehoon
Hello,
"Specify transmit power" in S-parameter configuration has nothing to do with the voltage amplitude in the Standard configuration. I mean independant to each other…
(Please know that the S-parameter configuration doesn't require any source (voltage/current…) definition, but the port definition is enough.)
If you use "Power settings" which was mentioned in my first reply, the total antenna power is forcely determined by the power in the "Power settings" regardless of the voltage amplitude.
@Jaehoon sir thanks for the explanation.
Let me answer how the total power is determined from 1) voltage source and 2) power setting.
1.Voltage source (without Power setting): The antenna delivered power is determined by the product of the voltage amplitude and current. Specifically, Power = V*I (current), where I is determined by Antenna operation. So, the total power of the array = Power from Antenna 1 + …. + Power from Antenna 4
2. Power setting (with Voltage source): The total power of the array = Source power in the Power setting (here 1 W), regardless of the voltage source's amplitude.
The third option, Incident power (transmission line model) considers the impedance mismatching loss (i.e. Reflection coefficient) between the system (reference) impedance (50 ohm) and the antenna input impedance. Therefore, the radiation power from the 2nd option is normally larger than the 3rd option.
@Jaehoon sir without power setting,"no power scaling" in the postfeko we can see "active power" what is this active power mean? total power of the array or varies for each element?
@Jaehoon sir kindly see the screenshot, for my simulation I used active port excitation for the 4x1 array. Here in screenshot the the input power is 0.5Watt, but for voltage source for each ports we defined 1V at each port, Does Feko force the input power to be 0.5W or it calculates input power as P= V*I?
