Polarization Loss Calculator

Calculated Result

The result appears here after submission and stays above the form.

Calculator Inputs

Polarization case

Choose the mismatch model that matches your link.

Transmit polarization angle (degrees)

Use the same angle reference for both antennas.

Receive polarization angle (degrees)

For linear antennas, mismatch depends on angle difference.

Manual efficiency (%)

Enter measured or simulated polarization efficiency.

Transmit power

Use watts or dBm, based on the unit selector.

Transmit power unit

The calculator converts power to dBm internally.

Net gain excluding polarization (dB)

Include antenna and system gains here.

Other losses excluding polarization (dB)

Enter path, connector, and feeder losses here.

Graph cap for display (dB)

Used only to keep the chart readable near nulls.

Polarization Loss Graph

The graph shows mismatch loss behavior for the selected case. Linear mismatch uses angle sweep data. Constant cases use a flat loss trace.

Example Data Table

Case	Mismatch	Efficiency Factor	Efficiency	Loss
Linear vs Linear	0°	1.0000	100.00%	0.00 dB
Linear vs Linear	10°	0.9698	96.98%	0.13 dB
Linear vs Linear	20°	0.8830	88.30%	0.54 dB
Linear vs Linear	30°	0.7500	75.00%	1.25 dB
Linear vs Linear	45°	0.5000	50.00%	3.01 dB
Linear vs Linear	60°	0.2500	25.00%	6.02 dB
Linear to Circular	N/A	0.5000	50.00%	3.01 dB
Opposite Circular Sense	N/A	0.0000	0.00%	Infinite

Formula Used

For linear antennas: η_p = cos²(Δθ)

Normalized mismatch: Δθ = min(|θ_tx - θ_rx| mod 180, 180 - previous value)

Polarization loss: L_p(dB) = -10 log₁₀(η_p)

Linear to circular ideal case: η_p = 0.5 and L_p = 3.01 dB

Circular same sense ideal case: η_p = 1 and L_p = 0 dB

Circular opposite sense ideal case: η_p = 0 and L_p approaches infinity

Received power before polarization loss: P_r,before(dBm) = P_tx(dBm) + G_net - L_other

Received power after polarization loss: P_r,after(dBm) = P_r,before(dBm) - L_p(dB)

This calculator combines classic polarization mismatch equations with a simple link budget view. That lets you see not only the loss itself, but also the effect on received power.

How to Use This Calculator

Select the polarization case that matches your antenna pair.
For linear antennas, enter transmit and receive polarization angles.
For measured data, switch to manual mode and enter efficiency.
Enter transmitter power in watts or dBm.
Add net gains and all non-polarization losses.
Press the calculate button to show results above the form.
Review the graph, metric cards, and detailed result table.
Use CSV or PDF export to save the current result set.

Frequently Asked Questions

What is polarization loss?

Polarization loss is power reduction caused by polarization mismatch between transmitting and receiving antennas. Better alignment improves coupling efficiency and preserves received signal strength.

Does a small angle error matter?

Yes. Even small angle errors can reduce coupling. At 30 degrees, linear mismatch causes about 1.25 dB loss, which matters in tight RF budgets.

Does frequency change polarization mismatch loss?

No. Frequency affects antennas and propagation, but mismatch loss depends on polarization relationship. Link frequency still matters for total received power calculations.

Why is linear to circular loss about 3 dB?

Linear to circular polarization creates a fixed 3.01 dB loss in ideal conditions. Only half of the linearly polarized power couples into the circular antenna.

Why does opposite circular sense show infinite loss?

Opposite circular senses ideally produce infinite isolation. Real systems show finite isolation because antennas are imperfect, so practical loss is very large, not truly infinite.

When should I use manual efficiency mode?

Use measured efficiency when polarization is elliptical, rotating, or specified by test data. Manual mode helps when a single angle formula is not enough.

How can I reduce polarization loss in practice?

Keep tilt references consistent, verify antenna sense, minimize mounting errors, and use alignment tools. Better mechanical control usually reduces polarization mismatch.

Can this calculator estimate received power too?

Yes. The calculator estimates received power before and after polarization loss. Enter transmitter power, net gains, and other losses for a fuller link view.