Topic
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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Papers
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11 Jul 2010
TL;DR: In this article, a single-slot antenna with a longitudinal slot was proposed and it has been shown theoretically and experimentally that if the length of the slot is about the wavelength in free space, the field distribution in the antenna aperture is very close to the optimal and consequently the antenna can reach its maximum efficiency.
Abstract: A novel antenna that utilizes waveguide properties of a cylinder with a longitudinal slot is presented in this paper. It has been shown theoretically and experimentally that if the length of the slot is about the wavelength in free space, the field distribution in the antenna aperture is very close to the optimal and consequently the antenna can reach its maximum efficiency. It has been shown that the single slot antenna can be used as a basic building block for high performance directional panel and base station antennas and also in active antenna arrays.
2 citations
01 Feb 2000
TL;DR: A large-signal model compatible with nonlinear-circuit-simulation CAD packages is developed and used to simulate the performance of the active antenna, including its phase-noise characteristics.
Abstract: The use of a heterojunction bipolar transistor in an active antenna operating as a self-oscillating Doppler sensor is investigated. A large-signal model compatible with nonlinear-circuit-simulation CAD packages is developed and used to simulate the performance of the active antenna, including its phase-noise characteristics. The active antenna operates at 11.4 GHz with an EIRP of 11 dBm. As a self oscillating sensor, it exhibits a minimum detectable signal relative to carrier of –99 dBm in a 10 Hz bandwidth. This gives the sensor a usable range of approximately 40 m making it useful for a variety of intruder-detection and other short-range-sensing applications.
2 citations
Patent•
02 Oct 2020
TL;DR: In this paper, the authors proposed a utility model where the antenna comprises a substrate and an antenna module printed on the substrate, the antenna module comprises a parasitic antenna unit and an active antenna unit, and the antenna unit is a single-stage antenna unit.
Abstract: The utility model discloses an antenna and a communication device. Wherein the antenna comprises a substrate and an antenna module printed on the substrate, the antenna module comprises a parasitic antenna unit and an active antenna unit, the active antenna unit is a single-stage antenna unit, and the active antenna unit and the parasitic antenna unit are arranged in a coupling manner, so that theparasitic antenna unit generates a superimposed radiation field. According to the utility model, the parasitic antenna unit can generate a superimposed radiation field under the action of the activeantenna unit, so that the superimposed radiation field is superimposed with the radiation field of the active antenna unit, and the working bandwidth of the antenna is improved.
2 citations
Patent•
25 May 2016
TL;DR: In this paper, a self-healing method and a self healing device for an active antenna system (AAS) were presented. But the self healing method was performed through a hardware mode, and it was not carried out when a certain channel or multiple channels of the AAS failed.
Abstract: The invention discloses a self healing method and a self healing device for an active antenna system (AAS), which relate to the field of AAS self healing technology. The method comprises the following steps: real-time monitoring is carried out on each transmitting and receiving channel connected with each antenna array; and when a transmitting and receiving channel is detected to fail, a transmitting and receiving unit connected with the transmitting and receiving channel which fails is switched to a normal transmitting and receiving channel. Through a hardware mode, system self healing is carried out when a certain channel or multiple channels of the AAS fails, and the cell performance indexes are improved.
2 citations
TL;DR: In this paper, a GA-based pattern optimisation of active array antenna (AA) vertical cell splitting system is proposed, where a joint optimization method of inner cell pattern and outer cell pattern is designed, and GA is applied to optimise the array's amplitude excitations for reducing the interference in AA vertical cell split system.
Abstract: A genetic algorithm (GA)-based pattern optimisation of active array antenna (AA) vertical cell splitting system is proposed. In the proposed algorithm, a joint optimisation method of inner cell pattern and outer cell pattern is designed, and GA is applied to optimise the array's amplitude excitations for reducing the interference in AA vertical cell splitting system. The simulation results and performance analysis demonstrate the feasibility and validity of the proposed algorithm. In comparison to the conventional identical-excitation active AA patterns, the optimised results show that significant gain in both cell average throughput and cell edge throughput is obtained.
2 citations