Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters PCB Directory Rigol San Francisco Circuits Reactel RF Connector Technology TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines RF Cafe Software RF Cafe Sponsor Links Temwell Werbel Microwave Thank you for visiting RF Cafe!
Filters - RF Cafe

Bell Telephone Laboratories - Lens Antenna
May 1946 Radio-Craft

May 1946 Radio-Craft

May 1946 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

At first look this antenna from Bell Telephone Laboratories appears to be a phased array, but in fact it is a "lens" that uses reflecting metal fins to direct incoming and outgoing radio waves into a narrow beam. This is a new approach to the standard method of using a curved (usually parabolic) reflective dish with a feedhorn. No detail is given about how, if at all, the phases of the received signals are phase-adjusted at the point they converge on the back-side waveguide feed. It is sort of akin to the Osgood optical lens used in lighthouses. Shortly after the end of World War II, Bell Telephone Labs began a major effort to interconnect the entire country with microwave relay stations to enhance efficiency and reliability of long distance telephone calls. Maybe it didn't matter. Bell Labs published many different infomercials in RF / microwave trade magazines like Radio-Craft from the 1940s through the 1960s.

Bell Telephone Laboratories - A "Searchlight" to Focus Radio Waves

Bell Telephone Laboratories Lens Antenna, May 1946, Radio-Craft - RF CafeIn the new microwave radio relay system between New York and Boston, which Bell Laboratories are developing for the Bell System, giant lenses will shape and aim the wave energy as a searchlight aims a light beam.

This unique lens - an array of metal plates - receives divergent waves through a waveguide in the rear. As they pass between the metal plates their direction of motion is bent inward so that the energy travels out as a nearly parallel beam. At the next relay point a similar combination of lens and waveguide, working in reverse, funnels the energy back into a repeater for amplification and re-transmission.

A product of fundamental research on waveguides, metallic lenses were first developed by the Laboratories during the war to produce precise radio beams.

This "searchlight" is a milestone in many months of inquiry through the realms of physics, mathematics and electronics. But how to focus waves is only one of many problems that Bell Telephone Laboratories are working on to speed microwave transmission. The goal of this and all Bell Laboratories research is the same - to keep on making American telephone service better and better.

Bell Telephone Laboratories

 Research and Development in Telephony • Telegraphy• Television• Wire Transmission • Radio • Aided by Physics • Chemistry • Acoustics • Mathematics Electronics • Metallurgy • Magnetics • Microchemistry • Electron Dynamics • Spectroscopy • Vibration Mechanics • Statistics • Crystallography Fundamental Studies in Speech and Hearing • Lubrication • Contact Alloys • Electrical Measurements • Corrosion and Decay • Quality Control • Design of Antennas • Cable • Capacitors • Coils • Cords • Dials • Microphones • Networks • Outside Plant Apparatus • Resistors • Vacuum Tubes Circuit and System Design for Crossbar • Panel • Step-by-Step • Manual • Amplifiers • Modulators • Oscillators • Repeaters • Gain Control

Bell Telephone Laboratories Infomercials



Posted May 13, 2021

Berkeley Nucleonics Vector Signal Generators Radar Simulations - RF Cafe

Werbel Microwave (RF power couplers, dividers)
Copper Mountain Technologies (VNA) - RF Cafe
Anatech Electronics RF Microwave Filters - RF Cafe

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free


About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website: