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Blog postA challenge in packaging is undesired package resonances. The cause of these resonances is a volume that is enclosed by electric conductors to create a cavity. All metal cavities filled with a vacuum will display a resonance at a frequency given by
Cavity Resonant Frequency = fr=c/2a (1)
Where:
fr = frequency of the resonance (Hz)
a = width of the cavity (m)
c = speed of light in a vacuum (m/s)
The cavity resonance predicted by (1) is the lowest frequ -
Blog postThe power grid can sustain many different types of faults in the system. A fault can occurs when there is an unexpected rapid change in current. Faults can occur for many different reasons such as lighting strikes. Other causes are failure of insulating material, salt spray, sagging lines under high current conditions, and physical disruption such as a tree touching or falling on transmission lines or other parts of the grid. Fig. 1(a) shows a tree branch across two nodes in an experiment. Fi
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Blog postOn March 31, 2017, Dr. Rick Sturdivant presented a peer reviewed paper at the IEEE Green Tech Conference. The paper is on research for a pico-hydro electric power generation system for the Nepal Himalayas. The research has revealed seven reasons that prior systems have failed and ways to overcome them. The paper also presented the baseline concept for the pico-hydro system. The paper will appear in the IEEE online archival system called IEEE Xplore. It may take a few weeks for it to be availa
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Blog postWhen performing risk analysis, some companies have pre-existing ways to catpure risks. If that’s the case and if those existing risk capturing methods are working, then follow them and figure out methods for improving them. If not, then there are at least four ways to discover risks [1]. They are:
1. Schedule Based: In this approach a large print of the schedule is developed—at least 3 feet wide and scaled to the required height. Risk meeting participants add their risks to the schedu -
Blog postA recent reivew of the book Transmit Receive Modules For Radar and Communication Systems (Artech House, 2016) authored by Rick Sturdivant and Mike Harris was published in the IEEE Microwave Magazine Vol. 18, No. 2, 2017. The review of the book was written by Dr. James Chu who is an IEEE Senior Life Member and professor at Kennesaw State University in Marietta, Georgia, United States. The review was very postive and the reviewer described the book as a “Must Have” item on the shelf for anyone
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Blog postTapered slot antennas (TSA) have been used for many decades. Possibly the most familiar form of a TSA is the Vivaldi antenna [1]. This type of antenna has found extensive use in antenna array systems [2, 3]. Numerical methods have been used for their design such as the TLM method [4] and FDTD method [5]. However, one limitation of Vivaldi type TSA antennas is they are electrically large, up to several wavelengths long [6] which can limit their application where size is a concern.
An a -
Blog postMolniya orbit satellite systems follow elliptical orbits. Becuase they can avoid interference issues with geostationary satellit systems (such as satellite TV), the U.S. Federal Communications Commission (FCC) has previously alocated significant bandwidth for these types of systems. For instance, the FCC granted a license to Virtual GEO with 4.5GHz of allowed bandwidth [1]. I published an article in the IEEE Access journal. The article is open access so it can be freely downloaded.
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Blog postLaptop computers have multiple features or characteristics that contribute to their reliability. The result is that laptop computers are in wide use with consumers. We will examine six of those characteristics and show how they contribute to laptop reliability.
1) Use Of Protective Materials
The first is the use of protective materials and structure for the display. Users expect their displays to be reliable and present high quality images during the full life cycle. Laptop stru -
Blog postSustainable electric power can be an impoortant part of solving hunger and health issues in remote areas of the world. However, sustainable solutions are still needed. As a result, I am part of an international team working to develop a sustainable pico-hydro electric power generation system for a village in the Nepal Himalayas. We are publishing our work so that the results can be used in other parts of the world. Some of our work was resently presented at the World Renewable Energy Congress
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Blog postI presented three papers at the IEEE Radio and Wireless Conference in Phoenix January 17-18, 2017. This is an international conference and draws participants from around the world including Europe and Asia. The conference consists of five related conferences that focus on the intersection between wireless communication theory, systems, circuits, and device technologies. This creates a unique forum for engineers to discuss various technologies for state-of-art wireless systems and their end-us
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