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June 2008 [Feedback] Feedback How can metamaterials be viable for modulus of refractive index |n| < 1 when the curves indicate Vgroup =Vphase = –3c (speed of light)? This can be seen where: dn/d? = 0 for Vg = c[n–? (dn/d?)]–X where ? = wavelength in vacuum This also invalidates signal and energy velocity. We now have much literature with curves that correspond to the profoundly researched anomalous dispersion... May 2008 [Feedback] Feedback A Job Well-Done Congratulations on your article dealing with microwave materials ("Microwave Materials Help Build An Industry," March 2008, p. 98). It has come to my mind those past times, trying myself to go beyond gigahertz with FR-4 materials. I really enjoy reading your articles. All are the product of an experienced engineer in MW and RF. ... April 2008 [Feedback] Feedback Please Explain Correction In the February “Feedback” under ‘Misleading Survey Results,’ what are you trying to say in the last paragraph? It is a negative statement and is not easily understood. Bob Langley Hello Bob, To summarize, we ran a quick online survey to see what people thought of AVX acquiring American Technical Ceramics. First of all, I was “leading the... February [Feedback] Feedback Misleading Survey Results SURVEYS SOMETIMES CREATE false impressions, and this was the case with an online survey recently conducted on the Microwaves & RF website and reported in this column in the December 2007 issue. The Quick Poll, which concluded last Nov. 28, asked the question, “Is the acquisition of American Technical Ceramics by AVX a good thing?” concerning the merging to two key RF/microwave-industry component ... January 2008 [Feedback] Feedback Article Corrections I WAS PLEASED to learn of the induction of my father to the Microwave Legends. I don't know who nominated him, nor who wrote the biographical sketch. It is mostly right, but one glaring error does exist. In the sentence, "This ‘hobby’ quickly grew into the Bliley Piezo-Electric Co. in Carlisle, PA," the city should be Erie, PA—where the company still exists. For future information, please look at my history of the... |
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