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.

Inkjet printed paper based quadrate bowtie antennas for UHF RFID tags

Abstract: Paper substrate is one of the paramount nominees for Radio Frequency Identification (RFID) tags, for the reason that it is one of the widely and the cheapest available substrates. In this paper, for the first time quadrate bowtie antennas with round corners [1] are realized and analyzed on paper substrate for UHF RFID tags. These inkjet printed antennas exhibit high performance which give freedom for their applications. Their area is smaller than the general triangle bowtie antenna and have advantages of smaller area, better return loss in high frequency and higher gain in normal direction of antenna plane compared with general triangular bowtie antenna.

Method and apparatus for electromagnetic logging with two dimensional antenna array

Abstract: A two-dimensional array of slot antennas which can provide two-dimensional quantitative dielectric and conductivity images of formations in the region surrounding an earth borehole. The antennas are mounted in a wall-engaging member of a logging device that is moveable through the borehole. Selected ones of the antennas are energized at given times to transmit electromagnetic energy into the formations, the electromagnetic energy being received at other antennas for processing to obtain formation properties.

Multiport Reactive Loading Matching Technique for Wide Band Antenna Applications Using the Theory of Characteristic Modes

Abstract: A systematic framework is presented for designing an antenna with arbitrary shape and expanding its input impedance and pattern bandwidths using reactive loading. This method, unlike other design procedures, allows us to control the current distribution over the antenna structure with potentially fine granularity. This technique is applied to wire and microstrip antennas and it is shown to achieve a very good impedance and radiation pattern performance over the desired band. The loads are combination of Foster and non-Foster elements, which are generally required to obtain such dramatically improved performance.

Dual-Band Dual-Polarized Compact Log-Periodic Dipole Array for MIMO WLAN Applications

Abstract: A compact dual-band dual-polarized log-periodic dipole array with a dimension of $160 \times 160 \times 60~\hbox{mm}^3$ for multiple-input–multiple-output (MIMO) WLAN applications is proposed. In this antenna, there are 12 antennas: six for horizontal polarization and six for vertical polarization. In order to achieve dual linear polarizations and beam switching, six horizontal antennas are placed in sequential, rotating arrangement on a horizontal substrate panel with an equal inclination angle of $60^\circ$ to form a symmetrical structure, while the other six antennas for vertical polarization are inserted through slots made on the horizontal substrate panel. Furthermore, six pairs of double T-type slits are introduced to mainly reduce the mutual coupling between the horizontal antennas. The proposed array is manufactured and exhibits the characteristics of high isolation, good front-to-back ratio, and average gains of 5 and 6 dBi over the 2.4- and 5-GHz band, respectively. The MIMO performance of the array is analyzed and evaluated by mutual coupling and the envelope correlation coefficient.