Minimization Of Antenna Research Articles

Compact patch antenna enabled by a metasurface with stereo elements.

We implemented a novel compact antenna by applying a metasurface with stereo elements (stereo-MS) as the superstrate of a patch antenna. The stereo-MS, an array of stereo patches printed on a grooved dielectric substrate, enabled the footprint miniaturization and bandwidth enhancement of the patch antenna. The overall size reduction of the stereo-MS antenna is over 38% compared with the conventional plane metasurface (plane-MS) antenna working in the same frequency range. A prototype antenna working at 5.3 GHz was designed, fabricated, and measured. Experiments demonstrated the fractional impedance bandwidth of the antenna was 44.5% at criteria |S11 |< -10 dB, covering the frequencies 4.18 to 6.56 GHz, and the average gain about 6.9 dBi in the band. Experimental results were found in very good agreement with the design, which confirms the functionality of stereo-MS in antenna minimization. Our antenna features a compact size (0.409 λ02) and low profile (3.024 mm). The stereo-MSs provide a new way for the size miniaturization of microwave and optical devices, such as antennas.

Design of Antenna Minimization for Wireless Sensor Network Node

With the development of WSN (Wireless Sensor Network) technology, WSN node requires its volume to become gradually small. Antenna of WSN node occupy the most area, therefore this paper puts forward minimization design for antenna of WSN node. A printed dipole antenna is designed and then by using antenna flexural method, the antenna structure is improved with minimization design. Under the condition of several performance indexes of the antenna can be met, the antenna area after minimization is decreased by about 39%.

Lower Bound on Scattered Power from Antennas

A lower bound on the total power scattered from a lossless and matched receiving antenna, for a given incident wave, is presented. The vector spherical wave expansion is used to describe the scattering and power absorption mechanisms. Scattering is the main reason behind antenna absorption. This poses a fundamental limit on minimization of antenna scattering. In other words, if we are to extract any power from the incident wave, the receiving antenna cannot be completely invisible, and scattering is an inevitable consequence of the power capturing process. To demonstrate the phenomena, a linear array antenna is optimized such that its scattered power is increasingly reduced and the total amount of scattered power for various incident angles is compared to our predicted lower bound.