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In this article, a novel dual broadband shared‐aperture perforated patch antenna is presented. The proposed antenna features dual broadband characteristics (S‐ and X‐bands) and relatively uncomplicated design consisting of a three‐layer structure without involving air gaps. The S‐band part of the antenna utilizes the aperture resonance and three‐section feed line to achieve a 26.5% bandwidth, while the X‐band part utilizes both aperture and stacked patch resonances to achieve a 25.6% bandwidth. The performance of the proposed dual broadband patch antenna is validated via numerical simulation and measurement. [ABSTRACT FROM AUTHOR]

ABSTRACT The use of tumor-specific resonances is investigated for more efficient microwave hyperthermia of breast cancer. This concept is based on the idea that an increased power coupling (or absorption) would take place at the resonance. For hyperthermia treatment, higher power absorption means faster temperature rise to a desired therapeutic level. The natural resonances would vary depending on the tumor size, shape, and breast tissue configuration. Therefore, by adaptively tuning the source frequency of an applicator corresponding to the tumor-specific natural resonance, it could improve the overall efficiency of hyperthermia treatment. In this article, we demonstrate this concept by applying the singularity-expansion method to estimate the natural resonances (poles) and using the frequency of the dominant pole as the tumor-specific frequency. The performance is evaluated via the power absorption density in the breast. Results from numerical simulations and a simple experiment shows that the optimal power absorption in the tumor takes place at the tumor-specific resonance frequency in comparison to other frequencies. Using a multielement array setup for focused microwave, we also demonstrate that the relative phase shift between the residues (of the poles) obtained at different array elements can be used for phasing the array to create a focus at the tumor. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2659-2665, 2013 [ABSTRACT FROM AUTHOR]

This paper proposes a new dual-band planar inverted-F antenna (PIFA) for ISM-band applications. The proposed antenna is designed using the Microwave Studio Software of Computer Simulation Technology (CST). The measured results of the antenna are compared with the simulated results. The effects of antenna parameters such as the slit geometry and ground plane are studied. Both lower and upper frequency bands can be determined independently, which is very useful for the design of dual-band antennas. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 211–214, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11172 [ABSTRACT FROM AUTHOR]