February 2018
Intermediate to advanced
432 pages
14h 48m
English
Content preview from Reflectarray Antennas
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8Terahertz, Infrared, and Optical Reflectarray Antennas
Electromagnetic waves cover a wide frequency spectrum, including microwaves and optics. The wave behavior at both microwave and optical frequencies follow Maxwell’s equations; hence many microwave concepts have been extended to optics, and in turn a lot of optical designs have been translated to microwave frequencies. For example, the invention of optical fiber [1], a kind of dielectric waveguide, greatly propelled the development of optical communications and the Internet. In addition, resonant optical antennas [2], are recently being studied that could contribute to the improvement of light emitters in the future.
In this chapter, we present some of the latest progress in terahertz, infrared, and optical reflectarray antennas. Most reflectarray antenna research in the recent years has been in the microwave and sub‐millimeter range [3], and while microwave concepts can generally be extended to higher frequencies, several factors come into play that complicate the antenna design. In this chapter, we will first study some basic material characteristics and design challenges, and then review several THz, infrared, and optical reflectarray antennas that have been developed over the years.
8.1 Above Microwave Frequencies
The region of frequency spectrum between microwave frequencies and visible light consists of terahertz (THz) and infrared bands, as shown in Figure 8.1. While certain applications such as far‐infrared spectroscopy ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.