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- Transmission coefficient vs Reflection coefficient of FSS radome

So I was reading about frequency selective surface radome, basically this is the kind of cover over the antenna which allow a certain frequency wave to pass through and reflect wave at any other frequencies.

What I don't understand is the reflection vs transmission coefficient chart.

So as I understand it.

So logically, wouldn't the two value always opposite?

Let me give a practical example:

below, the band pass frequency is 10Ghz, so the transmission coefficient is 0 dB while the reflection coefficient is extremely small (like -40 dB). That make total sense because if it reflect nothing then most energy can pass through the layer

But take for example at 6Ghz, the reflection coefficient is at 0 dB, meaning it reflect everything, so how come the transmission coefficient is not at -40 dB?.

Shouldn't the shape of the two curve for reflection/transmission coefficient completely reverse each other?

What I don't understand is the reflection vs transmission coefficient chart.

So as I understand it.

**The transmission coefficient**is a measure of how much of an electromagnetic wave passes through a surface**The reflection coefficient**is a*a*measure of how much of an electromagnetic wave reflected when it hit a surface, The reflection coefficient determines the ratio of the reflected wave amplitude to the incident wave amplitude.So logically, wouldn't the two value always opposite?

Let me give a practical example:

below, the band pass frequency is 10Ghz, so the transmission coefficient is 0 dB while the reflection coefficient is extremely small (like -40 dB). That make total sense because if it reflect nothing then most energy can pass through the layer

But take for example at 6Ghz, the reflection coefficient is at 0 dB, meaning it reflect everything, so how come the transmission coefficient is not at -40 dB?.

Shouldn't the shape of the two curve for reflection/transmission coefficient completely reverse each other?

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