Active antenna

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

Implementation of Small Active Antenna for GPS/GLONASS Receiving

Abstract: In this paper, GPS / GLONASS receiving a small active antenna is proposed. A microstrip patch antenna which supports dual-band (GPS and GLONASS) was optimized. The antenna size is . The jig was changed to confirm the proposed antenna characteristic size, was adjusted to feed gap of the patch antenna, it was confirmed by change in LNA shield case or not. The antenna jig size is . The maximum gain of the GPS band is 3.78dBi, the maximum gain of the GLONASS bands is 4dBi. To amplify the Satellite reception signal level, one-stage low noise amplifier(LNA) was designed. The LNA chip was using the BGA715 N7, the LNA gain is 19.9dB. The utilization possibility of the GPS / GLONASS receiving a small active antenna could be confirmed according to compare and analyze the simulation and measurement data.

Radio camouflage device

Abstract: FIELD: computer engineering; control systems. ^ SUBSTANCE: present invention relates to radio camouflaging stray electromagnetic radiation and picking up noise of computer equipment and control systems. The device contains a low-frequency noise source, an active antenna circuit and a noise source, which is made in form of a system of two connected generators, the first of which is a generator with delayed feedback and inertial auto-displacement, and the second - with regulated delayed feedback. The output of the first generator is connected to the input of the second generator using a coupling element, which is a non-directional T junction with step impedance-matching transformers. One arm of the coupling element is connected to a flat spiral antenna. ^ EFFECT: widening of the operating range in the high frequency band and reduced non-uniformity of spectral density of the camouflage noise signal. ^ 6 dwg

Field Measurement for Antenna Configuration Comparison in Challenging NLOS Locations

Abstract: This paper has two main objectives. First, it describes the practical challenges of field trials and proposes a developed test method. Second, the test method is used to compare the uplink (UL) performance with different antenna technologies when user equipment (UE) does not have a line of sight (LOS) to the evolved node B. Both passive and active antenna configurations were used in the performance evaluation. Modern cellular networks have high demands for capacity, reliability, and availability. The verification of a network’s configuration and technological features is essential to guarantee network performance, and the performance of a network must be verified by the laboratory testing or field trials; such trials produce the experimental knowledge of technology features and configurations. Technological and environmental factors must also be considered before performing mobile network field testing. This paper showed that moving UE produces more reliable and repeatable results than measurements with stationary UE. Our antenna configuration comparison study revealed that in the UL direction, active antenna system beam control could significantly increase the UL capacity in non-LOS conditions.

Method and apparatus for reducing energy consumption

Abstract: A method and apparatus may include activating, by a network node, power of a global-positioning-system receiver or power of an active antenna of the global-positioning-system receiver. The apparatus uses the global-positioning-system receiver to perform synchronization of the apparatus. The method may include receiving at least one measurement, wherein the at least one measurement comprises real-time, predictive, or historic data. The method may also include determining a holdover duration based on the at least one measurement. The holdover duration corresponds to a length of time where the power of the global-positioning-system receiver or the power of the active antenna is to be turned off. The method may also include deactivating the power of the global-positioning-system receiver or the power of the active antenna for the holdover duration.

Ka-band multibeam active phased array antenna

Abstract: The high data rate and global satellite communication systems are expected to be an important technology to the social and economic activities in this century. The experimental high data rate satellite communications more than 1.2 Gbps are required for the future multi-media applications. For these communication systems, a Ka-band Scanning Spot Beam Antenna (SSBA) which realizes multiple beam forming and operates a number of beams is required. For the full range connectivity all over the world, the Active Phased Array Antenna (APAA) is applied for the SSBA as one of the most important and challenging technology. It is required to realize high EIRP and G/T, and have the capability of changing on-board the locations of the user spot beams to match the varying broadband traffic and to provide coverage contingency for other satellites. We had developed a Ka-band APAA and small-sized modules using Monolithic Microwave Integrated Circuits (MMICs) with wide frequency bandwidth and evaluated the transmission performance for use of multiple carriers.