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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TL;DR: In this paper, a low-noise active receiving antenna based on a printed dipole and a Si-SiGe HBT in the 5.8 GHz band is presented, achieving a power gain of 8.3 dB compared to the respective passive antenna and a noise figure of 1.4 dB at center frequency.
Abstract: A low-noise active receiving antenna based on a printed dipole and a Si-SiGe HBT in the 5.8 GHz band is presented. A power gain of 8.3 dB compared to the respective passive antenna and a noise figure of 1.4 dB at center frequency were achieved. To improve the antenna gain, two of these components were combined with a small array with reduced beamwidth and comparable noise figure.
21 citations
TL;DR: In this paper, it is demonstrated theoretically that mutual coupling effects on the radiation pattern of an element in the presence of another one can be reduced with appropriate loads. But the choice of transistors for active antenna design then becomes clearer either for reception or for emission.
Abstract: It is demonstrated theoretically that mutual coupling effects on the radiation pattern of an element in the presence of another one can be reduced with appropriate loads. Constant coupling circles are calculated and plotted on a Smith chart. The choice of transistors for active antenna design then becomes clearer either for reception or for emission.
21 citations
Patent•
11 Jul 2012
TL;DR: In this paper, the authors proposed an active antenna device and a signal transmit-receive method thereof, which consists of digital processing modules, transmitreceive radio-frequency modules and an antenna array, and further comprises combiners, a passive antenna feeder phase-shift network and ANT (Antenna) slots, wherein the combiners are positioned between the transmitrer and the antenna array.
Abstract: The invention provides an active antenna device and a signal transmit-receive method thereof. The active antenna device comprises digital processing modules, transmit-receive radio-frequency modules and an antenna array, and further comprises combiners, a passive antenna feeder phase-shift network and ANT (Antenna) slots, wherein the combiners are positioned between the transmit-receive radio-frequency modules and the antenna array and used for combining active antenna radio-frequency signals and RRU (Radio Remote Unit) radio-frequency signals, sending the combined signals to corresponding antenna oscillators in the antenna array, receiving signals from the antenna oscillators, performing power distribution to the signals to obtain active antenna signals and RRU signals, and respectively sending the acquired signals to both the transmit-receive radio-frequency modules and the passive antenna feeder phase-shift network; and the passive antenna feeder phase-shift network is connected with the plurality of combiners and used for performing power distribution to RRU transmitting signals received by the ANT slots to obtain a plurality of paths, respectively sending the plurality of RRU transmitting signals to the plurality of combiners, combining RRU receiving signals from the plurality of combiners and outputting the combined signals to RRUs. Owing to the multiplexed antenna array, the equipment utilization ratio is improved.
21 citations
TL;DR: This paper details the use of a circuit-based EM modelling technique combined with a harmonic balance simulator used to model the radiation from the microstrip bodies comprising an active antenna circuit.
Abstract: This paper details the use of a circuit-based EM modelling technique combined with a harmonic balance simulator used to model the radiation from the microstrip bodies comprising an active antenna circuit. The modelling approach adopted for the planar bodies in the circuit will be shown to allow the use of concurrent algorithms in order to reduce overall computational time.
21 citations
TL;DR: In this paper, a Van Atta self-steering array with enhanced retro-directive properties is presented, and the experimental performance of the array is demonstrated and a technique is described which compensates for the beam pointing error induced by antenna array element directivity.
Abstract: A new architecture for the Van Atta self-steering array is presented. Active antenna techniques are used to realise a compact self-steering array with enhanced retrodirective properties. The experimental performance of the array is demonstrated and a technique is described which compensates for the beam pointing error induced by antenna array element directivity.
21 citations