Mi-Wave · Waveguide Polarizers
Linear to Circular Polarizers
Precise polarization conversion from microwave to mm-wave
The Mi-Wave Series 282 linear-to-circular polarizer converts a linearly polarized signal into right-hand (RHCP) or left-hand (LHCP) circular polarization, from 8 GHz to 220 GHz. It presents a standard rectangular waveguide port, holds axial ratio to 1.0 dB maximum and VSWR to 1.2, and is used in satellite links, radar and mm-wave measurement labs. The engineer picks the band and the circular waveguide ID, then states the polarization sense on the order. Evencat is an authorized Mi-Wave distributor in Taiwan.
Overview
Series 282 is a passive component for microwave and mm-wave systems that takes a linearly polarized input on rectangular waveguide and delivers a circularly polarized output. Twelve standard bands run from X-band (8–12.4 GHz) to G-band (140–220 GHz), covering SatCom, radar, RF links and antenna test. Each band model is offered with several circular waveguide IDs so the part can be tuned to a sub-band, and the polarization sense (RHCP or LHCP) is fixed at the factory to the order. Insertion loss is 1.0 dB through V-band, rising to 1.5 dB in D-band and 1.7 dB in G-band; axial ratio stays within 1.0 dB and VSWR below 1.2, and standard UG flanges let the polarizer bolt into an existing RF chain. For systems that need to change sense in the field, the Series 283 adjustable polarizer adds a manual switch between RHCP, LHCP and linear over the same 8–220 GHz range. When ordering, supply the center frequency (the XX field) and the circular ID (the .XXX field) along with the sense.
Key specifications
| Frequency coverage | 8 GHz – 220 GHz (X to G band, 12 standard bands) |
|---|---|
| Series | Series 282 (fixed sense) / Series 283 (adjustable sense) |
| Insertion loss (X to V band) | 1.0 dB (typical) |
| Insertion loss (D-band, 110–170 GHz) | 1.5 dB (typical) |
| Insertion loss (G-band, 140–220 GHz) | 1.7 dB (typical) |
| Axial ratio | < 1.0 dB (maximum, all bands) |
| VSWR | < 1.2 (maximum) |
| Polarization sense | Right-hand (RHCP) or left-hand (LHCP) circular polarization, stated on the order |
| Flanges | UG-39/U, UG-419/U, UG-595/U, UG-599/U, UG-383/U, UG-385/U, UG-387/U and -M variants |
| K-band model (282K) circular waveguide options | 0.470" ID (17.5–20.5 GHz) / 0.396" ID (20.5–24.5 GHz) / 0.328" ID (24.5–26.5 GHz) |
| E-band model (282E) circular waveguide options | 0.141" / 0.125" / 0.110" / 0.094" ID, for sub-bands within 60–90 GHz |
| Custom | Custom designs for specific frequency ranges, bandwidths, interfaces and polarization needs |
Features
Clean linear-to-circular conversion
Series 282 converts the linear input on rectangular waveguide into circular output with an axial ratio no worse than 1.0 dB, so polarization purity is preserved.
8–220 GHz in twelve bands
From X-band to G-band the series covers satellite links, mm-wave radar and 5G measurement without a change of vendor.
Switchable sense (Series 283)
The adjustable Series 283 switches between RHCP and LHCP by hand, which gives the system architect flexibility in the link without swapping hardware.
Several circular IDs per band
Each band model comes in a choice of circular waveguide IDs so the response can be centered on the sub-band in use.
Low loss, well matched
VSWR stays at or below 1.2 and insertion loss at 1.0 dB from X through V band, which protects power efficiency and keeps the system noise figure down.
Standard UG flanges
Industry-standard UG flanges let the polarizer connect directly to existing waveguide parts, antennas and test equipment, shortening integration.
Typical applications
Satellite communications
Feed polarization on satellite antennas
In the feed chain of a communications satellite or earth-station antenna, the polarizer turns the linear waveguide signal into RHCP or LHCP. The link then tolerates the polarization rotation caused by spacecraft attitude and Faraday rotation, and the gain budget stays stable.
Radar and EW
Suppressing rain clutter with circular polarization
Airborne and ground surveillance radars convert to circular polarization to cut the volume clutter returned by rain and cloud, because the backscatter from near-spherical drops largely cancels for a circularly polarized wave. Target detection in bad weather improves accordingly.
mm-wave R&D
Antenna and material measurement at mm-wave
In antenna pattern ranges, dielectric measurement and 5G mm-wave component labs, the polarizer on a Mi-Wave waveguide chain produces a clean RHCP or LHCP stimulus. Researchers use it to quantify the axial ratio, gain and cross-polar isolation of an antenna under test against a consistent, repeatable reference.
Options and configuration
Choose the band, waveguide size and polarization output you need; the selections are collected into a list and carried into the quote form.
Band and model
Polarization output
Custom and special requirements
Downloads
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