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Active antenna

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


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Journal ArticleDOI
TL;DR: In this article, the authors proposed a very compact antenna design for K-band applications using electromagnetic band gap (EBG) structure, which consists of circular patch and circular rings both as active antenna elements and EBG structures.
Abstract: This article proposed a novel compact antenna design for K-band applications using electromagnetic band gap (EBG) structure. A very compact design has been fabricated on a Rogers Duroid 4350 substrate and is multilayered with another substrate of similar dimensions. The design consists of circular patch and circular rings both as active antenna elements and EBG structures. The proposed antenna resonates at a frequency of 18.72 GHz with a wide band of about 1 GHz and a gain of 8.1 dBi along with a reduced side lobe level of −11.6 dB. The electromagnetic band structure incorporated along with a multilayer structure resulted in enhancement of impedance bandwidth and improvement in radiation characteristics. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2778–2781, 2015

1 citations

Proceedings ArticleDOI
14 Mar 2016
TL;DR: In this paper, an active antenna based on SPDT (single-pole double-throw) switch which forms three beams with two horns is presented, and the antenna which centers at 110GHz can get a maximal gain of about 17.7dB.
Abstract: An active antenna based on SPDT (single-pole double throw) switch which forms three beams with two horns is presented in this paper. The antenna which centers at 110GHz can get a maximal gain of about 17.7dB. The Y-shaped microwave switch, with an included angle of 90 degree, has a good impendence matching when single-arm or both-arms are on. The horn antenna is connected to the end of the switch as shown in Fig.1. A lateral radiation can be obtained when either arm of the switch is on, while a synthetic beam obtained with both arms on, thus forming three beams. These antennas can have a great usage in the application of THz sensing or detecting.

1 citations

01 Jan 2018
TL;DR: The signal processing techniques presented enable a simplified, low-cost design process of multi-antenna transmitters, and allow for feasible, high-complexity implementations of both digital and analog hardware even for systems with many antennas, thereby facilitating the development of future generations of wireless communication systems.
Abstract: Multi-antenna systems are utilized as a way to increase spectral efficiency in wireless communications. In a transmitter, the use of several parallel transmit paths and antennas increases system complexity and cost. Cost-efficient solutions, which employ active antenna arrays and avoid expensive isolators, are therefore preferred. However, such solutions are vulnerable to crosstalk due to mutual coupling between the antennas, and impedance mismatches between amplifiers and antennas. Combined with the nonlinear behavior of the power amplifiers, these effects cause nonlinear distortion, which deteriorates the quality of the transmitted signals and can prevent the transmitter from meeting standard requirements and fulfilling spectrum regulations. Analysis, assessment and, if necessary, compensation of nonlinear distortion are therefore essential for the design of multi-antenna transmitters. In this thesis, a technique for modeling and predicting nonlinear distortion in multi-antenna transmitters is presented. With this technique, the output of every individual transmit path, as well as the radiated far-field of the transmitter can be predicted with low computational effort. The technique connects models of the individually characterized transmitter components. It can be used to investigate and compare the effects of different power amplifier and antenna array designs at early design stages without complicated and expensive measurements. Furthermore, a digital predistortion technique for compensating nonlinear distortion in multi-antenna transmitters is presented. Digital predistortion is commonly used in transmitters to compensate for undesired nonlinear hardware effects. The proposed solution combines a linear function block with dual-input predistorters. The complexity is reduced compared to existing techniques, which require highly complex multivariate predistorter functions. Finally, a technique for identifying multi-antenna transmitter models and predistorters from over-the-air measurements using only a small set of observation receivers is presented. Conventional techniques require a dedicated observation receiver in every transmitter path, or one or more observation receivers that are shared by several paths in a time-interleaved manner. With the proposed technique, each receiver is used to observe several transmitter paths simultaneously. Compared to conventional techniques, hardware cost and complexity can be reduced with this approach. In summary, the signal processing techniques presented in this thesis enable a simplified, low-cost design process of multi-antenna transmitters. The proposed algorithms allow for feasible, low-complexity implementations of both digital and analog hardware even for systems with many antennas, thereby facilitating the development of future generations of wireless communication systems.

1 citations

03 Nov 2009
TL;DR: In this paper, an arc-slot microstrip antenna with harmonic rejection property is presented and the second and third harmonic rejection better than 15 dB have been achieved by optimizing antenna parameters.
Abstract: Novel arc-slot microstrip antenna with harmonic rejection property is presented. By optimize antenna parameters ,second and third harmonic rejection better than 15 dB have been achieved .Also patch size is compact and we have achieve size reduction about 40% of conventional square patch antenna with probe-fed.

1 citations

Patent
20 Jun 2017
TL;DR: In this paper, a reflective antenna array, including driving source, base plate able to programme, super material surface and metal support, driving source and base plate can program and super material fixed surface are on this metal support.
Abstract: The utility model discloses a reflective antenna array, including driving source, base plate able to programme, super material surface and metal support, driving source, base plate able to programme and super material fixed surface are on this metal support, a plurality of active antenna unit is drawn together to super material list bread, and this active antenna unit is including super material unit and connect the source diode that has between super material unit. The utility model discloses but corresponding " 0 " and " 1 " of rapid design code is arranged, has source diode, a control scanning beam angle and radiation beam through what base plate aplit -second control able to programme corresponded. Comparing with traditional structure, not needing machinery to rotate the radiation beam that antenna structure needing can realize azimuth angle, whole bulk reduction increases the flexibility.

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202148
2020113
2019123
201898
201789
2016102