Create and release your Profile on Zintellect – Postdoctoral applicants must create an account and complete a profile in the on-line application system. Please note: your resume/CV may not exceed 2 pages.
Complete your application – Enter the rest of the information required for the IC Postdoc Program Research Opportunity. The application itself contains detailed instructions for each one of these components: availability, citizenship, transcripts, dissertation abstract, publication and presentation plan, and information about your Research Advisor co-applicant.
Additional information about the IC Postdoctoral Research Fellowship Program is available on the program website located at: https://orise.orau.gov/icpostdoc/index.html.
If you have questions, send an email to ICPostdoc@orau.org. Please include the reference code for this opportunity in your email.
Research Topic Description, including Problem Statement:
The application of fractal geometry principles to the design of individual antennas and phased array antenna systems creates fractal antennas. Fractal antenna engineering can offer many techniques to optimize both antenna elements and phased array designs. For example, individual antenna geometries can be optimized to create fractal radiation patterns, to operate in multiple frequency bands, to minimize sensitivity to loads, to miniaturize lower frequency antennas (UHF/VHF), and to design frequency selective surfaces (FSSs).Due to their self-similar structure, fractal antennas also can provide broadband operation.
For phased array systems, designs based on a fractal lattice geometry—known as fractile phased arrays—can offer performance similar to that of a traditional phased array lattice design, such as rectangular or hexagonal, but with a reduced element count for optimized designs. Such a capability proves extremely beneficial for the systems engineer since it would reduce cost, complexity, and development time for a specific phased array system acquisition.
The approach is to conduct a study on various phased array designs based on fractal lattice structures to compare their performance against traditional phased arrays using both the mathematical array factor and the combined array antenna pattern, including a notional element pattern. The study would also include models and simulations on the performance comparisons for both broadside and beam steering operations to gauge scan loss and other performance metrics.
Example Approaches:
Much work has been presented in the literature for optimizing fractile phased arrays using genetic algorithms, particle swarm, and other techniques using peak side lobe level (SLL) as the fitness function. From a system engineering perspective, a more optimal fitness function may be the integrated side lobe ratio (ISLR), which is a ratio of the total integrated power in the side lobes to the total integrated power in the main beam. Minimizing ISLR may provide a higher signal-to-noise ratio (SNR) from the antenna. There is little to no work reported in the literature using this fitness function. An effort to optimize a fractile array design using both peak SLL and ISLR to compare outcomes would provide valuable design insight for future phased array systems.
A comprehensive understanding of the percentage of array antenna elements that could be reduced based on fractile phased arrays is needed. Because phased arrays are complex and costly to manufacture, reductions in element count can save a large amount of development and production time, thereby reducing costs.
A full understanding of beam steering and amplitude tapering for fractile phased arrays (optimized or not) is also needed.
Relevance to the Intelligence Community:
To understand how aperiodic phased array lattice designs could inform future phased array system designs for remote sensing systems.
Key Words: Fractals, Fractile, Phased Arrays, Array Antennas
You gave a rating of 0 star(s)
SECURITY/PRIVACY NOTICE
By continuing to use this system you indicate your awareness of and consent to the following terms and conditions of use. LOGOUT IMMEDIATELY if you do not agree to the conditions stated in this warning.
SECURITY NOTICE
This system is part of a Federal information system. This system is monitored for security purposes to ensure it remains available to all users and to protect information in the system. The system employs software programs to monitor network traffic to identify unauthorized activities. By accessing this system, you are expressly consenting to these monitoring activities. Unauthorized attempts to defeat or circumvent security features; to use the system for other than intended purposes; to deny service to authorized users; to access, obtain, alter, damage, or destroy information; to upload or change information; to otherwise cause system or information damage; or otherwise to interfere with the system or its operation, is prohibited. Evidence of such acts may be dis-closed to law enforcement authorities and result in prosecution under the Computer Fraud and Abuse Act of 1986 and the National Information Infrastructure Protection Act of 1996, or other applicable laws.
PRIVACY NOTICE
This system is for authorized use only. Use of this system constitutes consent to security monitoring and testing. All activity is logged with your host name and IP address. Users (authorized or unauthorized) have no explicit or implicit expectation of privacy. Any or all uses of this system and all files on this system may be intercepted, monitored, recorded, copied, audited, inspected, and dis-closed to authorized site and law enforcement personnel, as well as authorized officials of other agencies, both domestic and foreign. By using this system, the user consents to such interception, monitoring, recording, copying, auditing, inspection, and disclosure at the discretion of authorized site or law enforcement personnel. Unauthorized or improper use of this system may result in administrative disciplinary action and civil and criminal penalties.
You have been inactive on this page for . You will be logged out after 03:00:00.
Select an icon below to visit the website and download an appropriate browser.
For help, please email Zintellect@orau.org.
Question: What is the deadline for submitting an application?
Answer: Not all opportunities have application deadlines. Some opportunities remain open until they are filled. If an opportunity has an application deadline, then it will be listed in the opportunity details or in the opportunity catalog.
Question: How do I reset my password?
Answer: If you have forgotten your password or wish to reset your password, use the "Forgot password or username?" tab on the login to reset it.
Question: I forgot my username. How do I retrieve it?
Answer: Use the "Forgot password or username?" tab on the login. You will receive an email containing your username.
Question: What do I need to submit an application?
Answer: Typically, applicants are required to submit a resume or CV, an official copy of their transcripts or academic record, and a minimum of two references at the time they apply. Additional requirements such as a writing sample, thesis or dissertation, etc. may be required. Review the opportunity details for additional information about the requirements for applying for an opportunity.
Question: Where do I upload my transcripts?
Answer: If required, you will be asked to upload your transcript as a part of the application process.
Question: Where do I submit a writing sample?
Answer: If required, you will be asked to upload a writing sample as part of the application process.
Question: Can a family member serve as a reference?
Answer: No; family members may not serve as references. References must be able to speak to your educational and/or professional experience. At least one academic reference is preferred.
Our Zintellect A.I. is constantly learning how to Match you to our opportunities! So, we want to know when we get it right or when we get it wrong. This will help us make our better! Plus, as a potential applicant to one of our many opportunities across the country, we value you and want to help you on your career path!
