Contents
What is S11 of an antenna?
S11 (return loss) represents how much power is reflected from the antenna, and hence is known as the reflection coefficient (sometimes written as gamma: or return loss. If S11=0 dB, then all the power is reflected from the antenna and nothing is radiated.
What is the difference between gain and realized gain?
Re: what’s the difference between Gain and Realized gain in But of course realised gain has included all the facts that an antenna has some mismatching loss and loss in efficiency. While gain and directivity excludes one of these losses respectively.
What is peak gain of antenna?
Peak gain is a measure of input power concentration in the main beam direction as a ratio relative to an isotropic antenna source. Peak gain can also be referred to as Directivity, the key difference however is that directivity neglects antenna losses such as dielectric, resistance, polarisation, and VSWR losses.
What is the gain of an antenna at 1.6 GHz?
My antenna resonates at 1.6 GHz, and when the substrate (FR4) is very thin (0.5 mm), I get an S11 of about -20 dB. The realized gain at this frequency is -12.5 dB. If I make the substrate thicker, the S11 resonance gets worse, and the gain gets better.
What does S 11 mean on an antenna analyzer?
The amount of energy that returns to the analyzer is directly affected by how well the antenna is matched to the transmission line. A small S 11 indicates a significant amount of energy has been delivered to the antenna.
What is the realized gain of S11 resonance?
The realized gain at this frequency is -12.5 dB. If I make the substrate thicker, the S11 resonance gets worse, and the gain gets better. For example, making it 3 mm (instead of 0.5 mm), the S11 went to -4, and the gain went to -6. Can anyone explain why this is?
What is the gain of a PIFA antenna?
I am designing a PIFA antenna in CST microwave studio. I have found something peculiar that I do not quite understand. My antenna resonates at 1.6 GHz, and when the substrate (FR4) is very thin (0.5 mm), I get an S11 of about -20 dB. The realized gain at this frequency is -12.5 dB.