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The '''Tektronix WM490''' is a series of waveguide mixers for 490-series spectrum analyzers, e.g., the [[7L18]], [[492]], and [[494]]. | The '''Tektronix WM490''' is a series of waveguide mixers for 490-series spectrum analyzers, e.g., the [[7L18]], [[492]], and [[494]]. | ||
A waveguide is a structure which guides energy waves, such as electromagnetic waves or sound waves. Waveguides are metallic lines, similar in fashion to transmission lines, which are used at microwave frequencies. | A waveguide is a structure which guides energy waves, such as electromagnetic waves or sound waves. Waveguides are metallic lines, similar in fashion to transmission lines, which are used at microwave frequencies. Unlike coaxial cable which is also a transmission line, there is no center conductor within the waveguide. Signals propagate within the confines of the metallic walls that act as boundaries. The signal propagation is confined by total internal reflection from the walls of the waveguide. | ||
As described in "Spectrum Analysis Utilizing Waveguide Mixers" the Tektronix Application Note [[media:26W-5390.pdf|26W5390]] states that whether a measurement is made at audio frequencies or millimeter wavelengths, the spectrum analyzer is used to measure amplitude vs. frequency. Typical measurements include spectral energy distribution or signature of the energy source. This can be as simple as measuring harmonic levels of a continuous wave source to a more complicated occupied bandwidth measurement of a digital microwave transmission system. | As described in "Spectrum Analysis Utilizing Waveguide Mixers" the Tektronix Application Note [[media:26W-5390.pdf|26W5390]] states that whether a measurement is made at audio frequencies or millimeter wavelengths, the spectrum analyzer is used to measure amplitude vs. frequency. Typical measurements include spectral energy distribution or signature of the energy source. This can be as simple as measuring harmonic levels of a continuous wave source to a more complicated occupied bandwidth measurement of a digital microwave transmission system. | ||
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! scope="col"| Band Desig. | ! scope="col"| Band Desig. | ||
! scope="col"| Freq Range (GHz) | ! scope="col"| Freq Range (GHz) | ||
! scope="col"| Sensitivity<br/>(dBm) | |||
! scope="col"| Waveguide (EIA) | ! scope="col"| Waveguide (EIA) | ||
! scope="col"| U-Type Flanges | ! scope="col"| U-Type Flanges | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490K || K || 18.8 to 26.5 || WR-42 || UG-595/U | |WM490K || K || 18.8 to 26.5 || -100 || WR-42 || UG-595/U | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490A || A || 26.5 to 40 || WR-28 || UG-599/U | |WM490A || A || 26.5 to 40 || -95 || WR-28 || UG-599/U | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490Q || Q || 33 to 50 || WR-22 || UG-383/U | |WM490Q || Q || 33 to 50 || -95 || WR-22 || UG-383/U | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490U || U || 40 to 60 || WR-19 || UG-383/U-M | |WM490U || U || 40 to 60 || -95 || WR-19 || UG-383/U-M | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490V || V || 50 to 75 || WR-15 || UG-385/U | |WM490V || V || 50 to 75 || -95 at 50 GHz<br/>-90 at 75 GHz typ. || WR-15 || UG-385/U | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490E || E || 60 to 90 || WR-12 || UG-387/U | |WM490E || E || 60 to 90 || -95 at 60 GHz<br/>-90 at 90 GHz typ. || WR-12 || UG-387/U | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490W || W || 75 to 110 || WR-10 || UG-387/U-M | |WM490W || W || 75 to 110 || -90 at 75 GHz<br/>-80 at 110 GHz typ. || WR-10 || UG-387/U-M | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490F || F || 90 to 140 || WR-08 || UG-387/U-M | |WM490F || F || 90 to 140 || -85 at 90 GHz<br/>-75 at 140 GHz typ. || WR-08 || UG-387/U-M | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490D || D || 110 to 170 || WR-06 || UG-387/U-M | |WM490D || D || 110 to 170 || -80 at 110 GHz<br/>-70 at 170 GHz typ. || WR-06 || UG-387/U-M | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|WM490G || G || 140 to 220 || WR-05 || UG-387/U-M | |WM490G || G || 140 to 220 || -75 at 140 GHz<br/>-65 at 220 GHz typ. || WR-05 || UG-387/U-M | ||
|- style="text-align:center;" | |- style="text-align:center;" | ||
|119-1728-00<br/>G-J Band flange transition || J || 220 to 325 || WR-05<br/>WR-03 || 74-003<br/>74-005 | |119-1728-00<br/>G-J Band flange transition || J || 220 to 325 || -65 at 220 GHz<br/>-50 at 325 GHz typ. || WR-05<br/>WR-03 || 74-003<br/>74-005 | ||
|} | |} | ||
Notes: | Notes: | ||
* All mixers are equipped with standard UG-XXX/U type flanges as indicated. Flange adapters to standard MIL-F-3022 type flanges are provided in F, D, and G bands at no additional charge. | * All mixers are equipped with standard UG-XXX/U type flanges as indicated. Flange adapters to standard MIL-F-3022 type flanges are provided in F, D, and G bands at no additional charge. | ||
* The waveguide name WR stands for waveguide rectangular, and the number is the inner dimension width of the waveguide in hundredths of an inch (0.01 inch = 0.254 mm) rounded to the nearest hundredth of an inch. | * The waveguide name WR stands for waveguide rectangular, and the number is the inner dimension width of the waveguide in hundredths of an inch (0.01 inch = 0.254 mm) rounded to the nearest hundredth of an inch. | ||
* The Electronic Industries Alliance (EIA) is the body that defined the WR designations for standard rectangular waveguides. | |||
==Links== | ==Links== | ||