Reflective array antenna

About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.

On designing a supersynthesis antenna array

Abstract: An analytical approach to the design of a super-synthesis antenna array is applied in this paper. It involves isolation and separate optimization of the influence of different parameters on the sampling of the spatial frequency components. The approach requires a detailed understanding of the geometry of tracking by an ensemble of baselines, but it gives a nearly optimum array design without much help from a computer. A feature of this design is that by simply doubling the array elements, the synthesized main beam area of the array is reduced 16 fold. Extensive computations have been used to demonstrate this extraordinary result.

Low-Profile Patch Antennas for Over-Body-Surface Communication at 2.45 GHz

Abstract: Two low-profile patch antennas on small ground planes (0.25 lambda), suitable for over the body surface communication at 2.45 GHz are presented. On-body performance was investigated using FDTD simulations of S21 coupling of shorted microstrip patch antennas (S-MPA) and higher-order mode microstrip patch antennas (HM-MPA) placed on numerical tissue phantoms with characteristics of muscle tissue. The low-profile antenna coupling results are comparable to those achieved using a quarter wave monopole antenna on the same size of groundplane, mounted normal to the tissue surface, indicating that the low-profile antennas studied are promising for bodyworn antenna applications.

Three centuries of UWB antenna development

Abstract: This paper provides a historical overview of ultrawideband (UWB) antennas. Early radio was narrowband in conception, but UWB in practice due to various technical limitations. Oliver Lodge pioneered UWB antenna engineering in the nineteenth century with his invention of both the biconical and bowtie antennas, and J.C. Bose demonstrated the first horn antennas in 1897. These nineteenth century spark-gap UWB antennas were largely forgotten until the 1930s and 1940s when advances in RF technology made short wavelength compact UWB antennas more practical. For lack of wide-scale implementation, many of these mid-century designs were forgotten in turn. By the closing decades of the twentieth century, UWB antennas were still considered “the main limiting factor of a UWB system.” A third century of development kicked off (more-or-less) with the FCC's authorization of UWB wireless systems in 2002. A host of antenna designers re-discovered or reinvented twentieth century designs and advanced the UWB antenna arts further with innovations like compact planar implementations, UWB patch antennas, embedded UWB antennas, and spectral-filtered or frequency-notched designs. The three centuries of UWB antenna development have been characterized by the failure of successive generations of antenna designers to benefit from the lessons of earlier pioneers.

Body Effects on Thin Single-Layer Slot, Self-Complementary, and Wire Antennas

Abstract: Thin single-layer slot, self-complementary, and wire antennas for plaster-like sensor applications at 2.4 GHz band are presented. Two antennas of each type as well as an inductive meander structure are considered. The analysis is based on simulations and measurements using thin inkjet-printed antenna prototypes. Measurements show that the antennas are operational when placed at a 0.3 mm distance from the body. Slot-type antennas perform the best in the immediate proximity of the body, achieving -10 dBi maximum realized gain sufficient for short-range off-body wireless communications. The functionality of the radio interface at 2.4 GHz band is validated using a sensor prototype operating at 0.3 mm from the body.

Substrate free G-band Vivaldi antenna array design, fabrication and testing

Abstract: The antenna pattern of a linear Vivaldi antenna array fabricated for G-band (140–220 GHz) radar applications was measured to explore the performance of a novel fabrication technique that allows for miniature waveguide to 3D AirCoax transitions and small footprint millimeter wave RF networks without the need of a substrate. The array includes four Vivaldi elements fed through a 4:1 equal split power divider and two dummy elements at both edges. The array pitch is configured at lambda/2 (about 750 microns). The design allows for scaling into a 2D array for beam steering applications using miniature phase shifters, which are currently being developed. The fabrication technique, as well as measured beam patterns, are presented and opportunities as well as challenges are discussed.