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September 2011 [Education] Mixers, Detectors Serve MM-Wave Bands Millimeter-wave frequency bands offer invaluable bandwidth for a variety of commercial, industrial, and military applications. Of course, with increasing frequency comes increasing challenges in the design of the high-performance components needed for signal processing at frequencies of 30 GHz and higher. With ultrawideband (UWB) communications systems, for example, high-speed amplitude-modulation (AM) modulators and detectors are needed in support of fast data transmission over millimeter-wave... May 2007 [Feedback] UWB Development Thank you for printing my comments in your March issue concerning Yeap Yean Wei's article in the December 2006 issue ("Design A Simple, Low-Cost UWB Source," p. 68) and for his response to my comments as well. It seems to me that we both have similar experience with the matching problem of sources and antennas to be used in UWB technology. I am looking forward to Yeap Yean Wei's future paper in which he promised to describe the "real-world" problems and... March 2007 [Feedback] Low-Cost UWB Source With much interest I read Yeap Yean Wei's article, "Design A Simple, Low-Cost UWB Source," in the December 2006 issue of Microwaves & RF (p. 68). It reminded me of my old work with frequency multipliers using step-recovery diodes. I am finding one problem in both types of devices: your UWB and my frequency multipliers. The problem is that the load must be the 50-ohm termination. In my frequency multipliers, this load had to be well matched at a... February 2007 [Feedback] Wireless Devices It was with much interest that I read Nancy Friedrich's editorial on wireless power transmission ("Energy-Harvesting Solution Powers Wireless Devices," Breaking News, January 2007 Microwaves & RF Notepad.) This time they did it at 900 MHz! This is a problem that Mr. Tesla already tried to solve. It comes back again and again. The fact that Ms. Friedrich wrote, that you can get ~1 mW over one meter from a 10-W transmitter, has been known since 1900; possibly... |
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