Like many forms of microstrip patches, the annular ring has received considerable attention. When operated in its fundamental (TM) mode, this printed antenna is smaller than its rectangular or circular counterparts. The annular ring may also be somewhat broadband in nature when operated near the TM resonance [5]. It has been shown that the structure is a good resonator (with very little radiati...

Context. A scaling argument is presented that leads to a shallow water theory of non-axisymmetric disturbances in annular sections of thin Keplerian disks. Aims. To develop a theoretical construction that will aid in physically understanding the relationship of known twodimensional vortex dynamics to their three-dimensional counterparts in Keplerian disks. Methods. Using asymptotic scaling argu...

In this paper, a compact ultra-wideband microstrip-fed annular ring antenna with band notch characteristics for wireless local area network (WLAN) and dedicated short-range communication (DSRC) is proposed. The proposed antenna comprises an annular ring patch and a partial ground plane with a rectangular slot. The notched frequency band is achieved by etching a partial annular slot in the lower...