: Flavonoids, commonly found in various plants, are a class of poly-phenolic compounds having a basic structural unit of 2-phenylchromone. Flavonoid compounds have attracted much attention due to their wide biological applications. In order to facilitate further research on biomedical application of flavonoids, we surveyed the literature published on the use of flavonoids in medicine during the past decade, documented the commonly found structures in natural flavonoids, and summarized their pharmacological activities as well as associated mechanisms of action against variety of health disorders including chronic inflammation, cancer, cardiovascular complications and hypoglycemia. In this mini-review, we provide suggestions for further research on the biomedical applications of flavonoids.

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The design of a shared-aperture waveguide slot antenna operating in dual-band and dual-polarization (DBDP) is proposed in this paper for synthesis aperture radar (SAR) applications. The frequencies of the antenna are in both L-and C-band with frequency ratio of 4:1. The C-band horizontalpolarized subarray antenna is achieved by 16 V-shaped slots opened on a ridged waveguide, while the vertical-polarized subarray is realized by 16 longitudinal slots displaced from the centerline on the other ridged waveguide. The L-band vertical-polarized subarray is comprised by four groups of longitudinal slots cut in the metal-wall interlacing with the C-band dual-polarized antenna array sharing the same aperture. The L-band waveguide is a multi-ridge cavity under the C-band waveguide. A DBDP antenna module comprising 4×16 C-band dual-polarized elements and 1×4 L-band elements was manufactured in aluminum alloy. Experimental results show that the proposed antenna can obtain excellent electromagnetic performance and maintain satisfactory thermal and mechanical properties for space-borne SAR applications.

A mushroom-type surface based waveguide slot filtering antenna is proposed herein. First, using a mushroom-type surface replacing the conventional metal plane in the bottom of a rectangular waveguide, a novel filtering waveguide is achieved. This filtering waveguide functions as a bandstop filter when the surface performs as a perfect magnetic conductor. Then, a filtering waveguide slot antenna is obtained by cutting radiating slots on the top of the filtering waveguide. Compared with a traditional waveguide slot antenna, the proposed antenna has nearly the same radiation characteristic while realizes an additional filter selectivity with almost no extra volume occupying. A prototype is demonstrated in Ku-band with operating in 12.25-12.75GHz and rejecting over 14.0-14.5GHz, which can be a candidate for receiving antenna of satellite communication. The measured results agree well with the designed ones, showing a suppression level stronger than 40dB in the rejecting band.