ThinKom Solutions (United States)

The above paper (K.K. Chan and S.K. Rao, 2008), has been read with considerable interest. We wish to point out that the design, including radiation and wide-bandwidth characteristics, of multiflared high-efficiency horns has already been published in an invention disclosure (A.K. Bhatacharyya and J. Sor, 2004) which has been in the public domain since June 8, 2006. The high-efficiency multiflared horn structure was first designed in 2003 at the company of the first author. Since then, the structure has been used as radiating elements for arrays and as reflector feeds in several communication satellite projects.

The continuous transverse stub (CTS) array represents a unique class of array antenna that exploits the low-loss, low-dispersion, dimensional robustness, and design flexibility of an open parallel-plate structure as both its transmission-line and radiator basis. Relative advantages of this array type include unusually high aperture efficiencies; precision sidelobe control; benign active impedance dependence on both frequency and scan angle; and inherently low cost This paper describes and illustrate recent wideband, dual-polarized and phased-array developments of the CTS array applied to fixed and mobile terrestrial- and satellite-based broadband access applications at both microwave and millimeter-wave frequencies.