SAS-233-39642-F1

Linear to Circular Polarizer, K Band, 20 to 25 GHz
SAS-233-39642-F1 is a K band, linear to circular polarizer that operates
at 22.5 GHz with a ±2.5 GHz bandwidth. The polarizer offers a maximum
insertion loss of 1.0 dB, a typical axial ratio of 1.1, and a typical returnloss of 20 dB. The polarizer is fixed and can be used for either righthanded or left-handed polarization based on the direction of the input
signal. The polarizer is often combined with Eravant’s rectangular tocircular waveguide transition (SWT-42396-SA) and WR-42 conical hornantenna (SAC-2309-396-S2) for various system applications.

Electrical Specifications:Parameter

Minimum

TypicalMaximum

ECCN

Frequency Range

20.0 GHz

22.5 GHz

25.0 GHz

EAR99

Bandwidth±2.5 GHz

Insertion Loss

0.5 dB

Axial Ratio

1.1

Return Loss

20 dB

Specification Temperature+25°C

Operating Temperature

1.0 dB

•
••

-40°C

+85°C

Specification

Circular Waveguide Interface
Low Insertion Loss
Good Axial Ratio

APPLICATIONS••••

Mechanical Specifications:
Item

FEATURES

Antenna Ranges
Waveguide Polarization Selection
Radar SystemsCommunication Systems

SUPPLEMENTAL DETAILS

WaveguideØ0.396” Circular Waveguide with UG-595/U-M Flange

Length2.0”

Case Material

Aluminum

FinishGold Plated

Weight0.7 Oz

Outline

AS-FKB-396

www.eravant.com | 424-757-0168 | support@eravant.com
Copyright © 2023 by Eravant

Final Rev 1.2
1/4

SAS-233-39642-F1

Simulated Axial Ratio vs. Frequency
-0.8
-0.85
-0.9

Axial Ratio-0.95-1-1.05
-1.1
-1.15
-1.2
20

20.5

21

21.5

2222.52323.52424.5252323.52424.525

Frequency (GHz)

Measured Insertion Loss vs. Frequency
0-0.5

Insertion Loss (dB)

-1-1.5-2-2.5-3-3.5-4-4.52020.52121.52222.5Frequency (GHz)www.eravant.com | 424-757-0168 | support@eravant.com
Copyright © 2023 by Eravant

Final Rev 1.22/4

SAS-233-39642-F1

Mechanical Outline: (Unless otherwise specified, all dimensions are in inches [millimeters])

NOTE:
••••

On condition that test data is provided it is collected from a sample lot. Actual data may vary slightly from unit to unit. Alltesting is performed under +25 °C room temperature.
On condition that simulated test data is provided, actual measured data may slightly vary.
The polarizer is offered as LHCP. However, it can be used as RHCP by reversing the input and output ports.
Eravant reserves the right to change the information presented without notice.

CAUTION:•If a waveguide is present, any foreign objects in the waveguide will cause performance degradation and may damage ordestroy the unit.

www.eravant.com | 424-757-0168 | support@eravant.com
Copyright © 2023 by Eravant

Final Rev 1.2
3/4

SAS-233-39642-F1

LHCP and RHCP Polarization Configuration Notes and Diagram:•••

The polarizer’s product label indicates the direction of Left-Handed Circular Polarization (LHCP).
An example configuration diagram is provided below. The diagram indicates the input and output ports and the orientationin which the polarizer is to be attached to the rest of the components to obtain a LHCP signal at the output port.
The polarizer can be configured to obtain a Right-Handed Circular Polarized (RHCP) signal at the output port by
reversing the input and output ports as shown in the second diagram.

www.eravant.com | 424-757-0168 | support@eravant.com
Copyright © 2023 by Eravant

Final Rev 1.2
4/4