Active antenna

About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.

Multi-frequency active antenna

Abstract: The invention provides a multi-frequency active antenna comprising a broadband antenna, a combiner, and an active module. The frame of the broadband antenna is provided with a recessed window, and a first port of the broadband antenna is disposed in the window. The combiner is detachably inserted in the window. The first port of the combiner is connected with the first port of the broadband antenna. The frame of the broadband antenna is provided with an insert. The active module is detachably connected with the insert. The first port of the active module is connected with the second port of the combiner. The frequency evolution of the broadband antenna can be supported.

Active antenna radiator with integrated design

Abstract: The utility model discloses an active antenna radiator with an integrated design, which is characterized by comprising a substrate and a radiating fin formed on one surface of the substrate, wherein the other surface of the substrate is provided with at least one active module installation hole position; and the radiating fin is arranged correspondingly to the active module installation hole position. The active antenna radiator has the advantages of furthest playing the radiating effect in the limited space, improving the waterproof effect of an active antenna, greatly reducing the production cost and the like.

An active antenna element

Abstract: An active antenna element comprises a filter (50), an antenna element (40) and a common plate (100). At least a part of said common plate is shared by said filter and antenna element and provides both a reflector of said antenna element and a part of said filter.

On the Performance of the Multiple Active Antenna Spatial Modulation with 3-Dimensional Constellation

Abstract: In spatial modulation (SM), a single signal symbol is transmitted from a given physical antenna, where both the signal symbol and the antenna index carry information. SM with multiple active antennas (MA-SM) transmits several signal symbols from a combination of antennas at each channel use, thereby increasing the spectral efficiency. MA-SM is proposed in combination with a new 3-dimensional constellation, where signal symbols transmitted from a given antenna combination are rotated before transmission. In this paper, we derived an upper-bound on the error probability of the MA-SM as a function of the rotation angles. The search for the optimal rotation angles is modeled as a multi-objective optimization problem. We concluded based on both analytical and simulation results that the 3-dimensional constellation with the optimal angles achieved negligible improvement. Therefore, we do not recommend using the 3-dimensional constellation with the MA-SM system.

Mixing behavior of a dual-patch active antenna oscillator at 1.2 GHz

Abstract: Active antennas have received attention in the literature for the size, weight, and cost improvements they allow. Of interest for communications purposes are self-oscillating mixer active antennas. These systems use a single active device to perform both oscillation and mixing functions. We report the significant mixing gain of a dual-patch active antenna oscillator based on a MMIC RF amplifier and operating at 1.2 GHz. The conversion gain depends on the supply voltage of the amplifier and the IF chosen. The present setup uses only four discrete components and could be used as the front-end for a simple FM receiver.