Monday, September 16, 2019
Login

Fixed, Level Setting, Direct Reading, and Programmable Attenuators

Parent Category: 2017 HFE

By SAGE Millimeter

SAGE Millimeter offers four types waveguide attenuators: fixed, level setting, direct reading, and programmable attenuators.

Fixed and Level Setting Attenuators

These attenuators are constructed with an E Plane resistive insert in the rectangular waveguide.

The operating waveguide mode is TE10. The insertion loss and attenuation of this type of attenuator is frequency dependent. The difference between these two is that level setting attenuators have a micrometer for attenuation value reset or memorization, and fixed attenuators have their attenuation value set at certain value at center frequency. Although the attenuation value of level setting attenuators can be calibrated against the micrometer scales, it is not recommended to use the calibrated level setting attenuator as attenuation the standard; the attenuation level is frequency dependent. See the typical chart below for an E Band level setting attenuator.1712 HFE appNote fg01

While the fixed attenuator is offered for link or path attenuation setting at a fixed value, the level setting attenuator offers a low-cost means to have a quick attenuation value set.

Direct Reading and Programmable Waveguide Attenuators

Direct reading and programmable attenuators are constructed with a precision resistive rotary vane in a circular waveguide.

1712 HFE appNote fg02

The operating mode of the attenuators is circular waveguide TE11 mode. Unlike fixed and level setting attenuators, the attenuation value and phase shift of these attenuators are frequency independent. The reason being that the attenuation value of this kind of attenuator is strictly related to the area of the resistive vane exposed to the electrical field. Therefore, the frequency dependent element, length, remains constant while the rotating angle changes. Because of this unique feature, the rotary vane based attenuator can be made for direct reading when the relationship of the attenuation value vs. rotation angle is characterized. The programmable version of this type of attenuator is made by replacing the drum with the digital control driver circuits. See the typical chart above for an E Band direct reading attenuator.

1712 HFE appNote fg03

1712 HFE appNote fg04

1712 HFE appNote fg05

Despite providing more precision and convenient attenuation settings, the direct reading and programmable attenuators are bulky and cost prohibitive.

1712 HFE appNote fg06

 

September 2019

1909 HFE cover

The September 2019 Online Edition is now available for viewing and download!

Download September HFE PDF

Search

Web Exclusives

AWR

AWR logo

e-Book – Microstrip Antenna Design

A new e-book, authored by industry veteran Kenneth Puglia and featuring NI AWR Design Environment software, explores microstrip antenna design and examines the single-element rectangular microstrip antenna as well as antenna arrays constructed from single microstrip elements. The eBook is available at awr.com/resource-library/ebook-microstrip-antenna-design (registration required).


Contact Us

Scott Spencer
Publisher
603-759-1840

Tim Burkhard
Associate Publisher
707-544-9977
Fax: 707-544-9375

Gary Rhodes
VP Sales
631-274-9530
Fax: 631-667-2871

Stuart Dale
Advertising Sales – New England
508-740-6128

Jeff Victor
Advertising Sales - Western U.S. - New Accounts
224-436-8044
Fax: 509-472-1888

Sam Baird
Advertising Sales - UK and Europe
+44 1883 715 697
Fax: +44 1883 715 697

Joanne Frangides
Advertising Sales - New Accounts & Product Showcase
201-666-6698
Fax: 201-666-6698

Insulated Wire Inc.

Insulated Wire Inc. is pleased to announce that following the retirement of a French delegate, IW Microwave Products Division President, John Morelli, has been appointed as the Secretary for IEC/SC46F, a subcommittee of IEC/TC46. IEC/SC46F is responsible for RF and Microwave Connectors and Components International Standardization.

Mr. Morelli, who is sponsored by Insulated Wire, brings significant RF/Microwave connector and component experience to the position, and we congratulate him on his new appointment. Mr. Morelli had been serving as the chief Technical Advisor for the US National Committee’s Technical Advisory Group to IEC/SC46F.

The US National Committee of the IEC is a fully integrated entity of the American National Standards Institute (ANSI).

Coming Events

IMS 2019, Boston, June 2 - 7, 2019

IEEE EMC + SIPI, New Orleans, July 22 - 26, 2019

IEEE AUTOTESTCON, National Harbor, MD, September 9 – 12, 2019

EuMW 2019, Paris, September 29 - October 4, 2019

MILCOM 2019, location TBD, October 2019 (date TBD)

AOC, Washington, DC, October 28 - 30, 2019

IEEE Radio and Wireless Symposium, location TBD, January 2020 (date TBD)