Optical true time-delay feeder for phased array antennas using fiber Bragg gratings and metal-film reflectors

✍ Scribed by Jong-Dug Shin; Duk-Hee Bae; Boo-Gyoun Kim

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 116 KB
• Volume: 45
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.20743

✦ Synopsis

Abstract

A novel optical true time‐delay (TTD) feeder for phased‐array antennas incorporating a fiber Bragg grating (FBG) prism and optical fibers with metal film deposited on their cleaved ends is proposed. By arranging a metal‐film reflector at one end of the fiber delay line with FBGs written at different locations, one FBG for every fiber delay line can be saved (compared to FBG‐only TTD feeders) and flexibility of wavelength selection is also provided due to the uniform reflectance of the metal film in a broad wavelength range. A TTD feeder with two fiber delay lines for 10‐GHz linear phased‐array antennas is built to steer a beam into three directions at 0° and ±30°. The experimental results of the time delays agree well with those calculated at all the steering angles. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 122–124, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20743