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August 2010 [Feedback] Feedback Continuing The Discussion In the June issue of Microwaves & RF, I presented my request to clarify Fig.1 in the article, “Antenna Assists MW Power Transmission”. The author failed to respond and explain it, and I still do not understand it. In describing the figure, he wrote that the DC... July 2010 [Feedback] Feedback Author’s Response I thank Mr. Polivka for reading my paper (“Reader Feedback,” June, p. 13). Yet I’m concerned that Mr. Polivka does not understand the arrangement of my rectenna (Fig. 1). I’m not sure why he is talking about single phase and efficiency of 50 percent. In this paper, we have done new research and it is not a copy of ref. 14. It should be noted that refs. 7 and 15 provide an RF conversion efficiency of about... June 2010 [Feedback] Feedback Dear Mr. Kumar: With interest I read your paper in the MWRF May issue, “Antenna Assists MW Power Transmission.” I am not sure if I understand the arrangement of your rectenna in Fig. 1. In fact, the antenna is loaded with a Schottky diode; the capacitor and tuning stub seem to me to be on a wrong side of the antenna-detector combination. The “Load” is possibly the DC load. On p. 73 you refer to the design by Bharj et al. who designed a... May 2010 [Feedback] Feedback I followed your article (“Forecast Rain Effects On Microwave Links,” April, p. 78) in your attempt to show readers how to forecast rain effects in microwave terrestrial and satellite links. I have studied microwave propagation in the atmosphere with precipitation and know the theory behind it. I did an interesting science by using microwave radiometers in emission mode to obtain loss... April 2010 [Feedback] Feedback To The Editor: The article in the January 2010 issue of Microwaves & RF entitled “Match Loop Antennas Via Mutual Inductance” is a rehash of the old loop-coupled loop. This was invented by Dunlavy and patented in 1971. Both loops have small radiation resistances and individually low efficiencies. The overall efficiency is essentially the product of the two loop efficiencies, and this number will be very small.... March 2010 [Feedback] Feedback Finding The Missing Piece Mr. Browne, Your article in the March 4 MWRF UPDATE e-newsletter titled, “Making Wireless ICs A Commodity,” got off to an interesting start. But it appears to have been cut short on the MWRF web site. Is it available elsewhere? Best regards, Steve Preston Hi Steve, Thanks for asking, and for reading. I’ve been hearing from folks that it is not obvious what I am... 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...  prev. page
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