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February 2010 [Feedback] Feedback To The Editor: In reading your December 2009 issue and the report on the “Top Products of 2009,” I was intrigued by the diversity of the products on the list, everything from the smallest ICs and low-cost voltage-variable attenuators (VVAs) to the most expensive vector network analyzers (VNAs). Yet, on the same list with these fancy VNAs were low-cost power meters built into the shell of a Universal Serial Bus (USB) ... January 2010 [Feedback] Feedback Error In Figure I found a small error in Fig. 2 in the December 2009 article, “Mixers Terminate Intermod Distortion.” In the figure, the labeling on the y-axis for the 1-dB compression plot has been reversed. From top to bottom, the axis should go from +25 dBm down to 0 dBm. The printed version is reversed, making the T3 appear to have worse 1 dB... December 2009 [Feedback] Feedback Software Reviews Needed Your comments in the November 2009 editorial on free design software struck a resonant chord in my company, since we operate with limited resources and cannot afford to equip every engineer who would so chose it to have a seat on our full-function microwave simulator of choice. For that reason, we are often experimenting with freeware and other low-cost options, especially when evaluating part of a... November 2009 [Feedback] Feedback A Legends Nominee I would like to nominate Dr. Robert Page of the Naval Research Laboratory who made major contributions toward the initial invention of radar and the monopulse radar tracking technique. The invention patent No. 1,981,884, “System for Detecting Objects by Radio,” by Taylor, A. H., Hyland, L., and Young, L. C., of the Naval Research Laboratory was successful with a contribution by Page with his invention No. 2,512,673,... October 2009 [Feedback] Feedback I read the September issue of Microwaves & RF, especially the editorial on the importance of military applications to the high-frequency electronics industry (“Military Vital To RF Industry”) and the News Report on how improvements in component performance are impacting the effectiveness of military electronic systems (“... September 2009 [Feedback] Feedback VVAs Actually Operate To 7 GHz Dear Editor, Thank you for your coverage on the new voltage-variable attenuators (VVAs) from Mini-Circuits in the July issue of Microwaves & RF. Unfortunately, on the front cover of the magazine, as well as in the title of the article and in references throughout the article, it refers to controlling amplitude at RF/microwave frequencies to 6 GHz. In fact, as listed within... August 2009 [Feedback] Feedback Dear Editor, First of all, let me commend you and your magazine for your efforts to bring younger, less experienced RF/microwave design engineers “up to speed on the many complex topics that comprise our industry, notably in your monthly RF Primer article. I read with great interest your installment on electromagnetic simulation software tools, “EM Simulators Study Field Patterns,” in the July 2009 issue of Microwaves & RF and found it to be... July 2009 [Feedback] Feedback Software Important To Military Designers Dear Editor, Your story on military electronics in the June issue, “Targeting Trends In Military Electronics,” did a commendable job of covering a great deal of ground in a few pages. However, while addressing such areas as materials science and measurement equipment, it left out one important area to military system designers, and that is in the area of... June 2009 [Feedback] Feedback Don’t Forget RLC’s Filters Dear Editor, In reading the RF Primer article in the April issue of Microwaves & RF, we noticed that you featured microwave filters (“Screening Requirements For Microwave Filters,” p. 40). As you know, RLC Electronics has been a leading manufacturer of microwave filters for 50 years, although RLC was not mentioned in the article. As we are a paid... May 2009 [Feedback] Feedback Remembering Old MMICs Dear Editor, In my article in the March issue, “Recalling Early GaAs MMIC Developments” (p. 68), I noticed that the image for the GaAs MMIC switch in Figure 13 was severely cropped and did not show the full details of the device. In addition, the article shows the block diagram for the GaAs T/R module in Figure 14, and mentions the actual device as Figure 15, but neglected to include the Figure 15 image for... April 2009 [Feedback] Feedback White Papers Found Here In the January and February Application Notes, we spotlighted two white papers from Anatech that some people have had trouble locating on the company’s web site (see “Filter Choices Help To Eliminate Interference,” January 2009, p. 86 and “Specify Filters Right The First Time,” February 2009, p. 88). The white papers were meant to simplify the search process for RF/ microwave filters by... March 2009 [Feedback] Feedback Measuring Phase Noise Dear Editor, I read with great interest your report on phase noise in the February issue of Microwaves & RF. For the most part, the article made valid points about the vagaries of phase-noise specifications in product data sheets. The phase noise decreases with distance from the carrier frequency. In some systems, close-in phase-noise performance is not critical and the further-out ... February 2009 [Feedback] Feedback Expanding Bandwidth I saw the January 2009 issue of Microwaves & RF and the first installment of the magazineâ??s new section, RF Primer. We appreciate Tektronix being included in the inaugural article on spectrum analyzers and the use of the photograph for the RSA6114A real-time spectrum analyzer that appears on p. 40 of the article. In general, the article was well done and quite informative, especially for readers needing a tutorial... January 2009 [Feedback] Feedback Correction In the article, “Silicon Capacitors Eye Niche RF Microwave Applications,” (November Focus supplement, p. S1), the editors neglected to point out that AVX Corp. debuted silicon-based capacitors about 20 years ago. We thank the folks at AVX for setting the record straight on these capacitors. Unknown Legends While I rarely communicate concerning reader feedback, I... December 2008 [Feedback] Feedback Unknown Legends With interest, I read the Microwave Legends article in the October issue of Microwaves & RF. I was interested in the history of radar development and I found the book by Louis Brown: History of Radar, the best source of historic information. From other books on radar development, I have found—to my surprise—that Boot and Randall were NOT the first who developed the cavity magnetron with high output... November 2008 [Feedback] Feedback Where Are The Antennas? To The Editor: There is a great deal to like about the coverage in your magazine, although one cannot help but notice the preponderance of articles on oscillators. Certainly, I applaud the depth of coverage on signal sources. But it would appear, just from a cursory review of recent issues, that the editors of Microwaves & RF have been negligent in covering one important system... October 2008 [Feedback] Feedback To the Editor I read with interest your article in the August issue of Microwaves & RF, “Crystal Oscillators Continue to Shrink,” p. 33. As a designer of RF/microwave function modules for commercial and military applications, I think it is fair to say that I am not much different from your readers who are involved in higherlevel microwave designs (beyond the component level) and, as such, need to develop and produce... September 2008 [Feedback] Feedback Metamaterials and the possibility of negative refraction are interesting, but before industries based on classical and quantum electrodynamics can take them seriously, questions of faster-than-light propagation must be addressed. A negative value of n is required so that the velocity reverses Snell’s Law of refraction, but this cannot be valid with modulus of n < 1 and dispersion curves which indicate that all the velocities are faster than the... August 2008 [Feedback] Feedback Dear Nancy: I read wIth Interest your editorial, “students abroad also spurn science.” For many decades, the US has acted as a colonial power, not reaping benefits from physical colonies, but by fishing for talent, taking the world's best and brightest. This is often justified in the US as being open minded and giving such talent a place to develop, but much of that... 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...  prev. page
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