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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Patent•
04 Dec 2020
TL;DR: In this article, an adjustable probe array device is proposed for active antenna multi-probe amplitude-phase testing, which consists of a plurality of probes and a supporting plate, the supporting plate is provided with hollow probe adjustable areas, the probe adjustable area is arranged in an array mode, one probe is installed in each probe adjustable area, and a probe array is formed.
Abstract: The invention relates to equipment and a method for active antenna amplitude-phase testing. The invention discloses an adjustable probe array device for active antenna multi-probe amplitude-phase testing. The adjustable probe array device comprises a plurality of probes and a supporting plate, the supporting plate is provided with hollow probe adjustable areas, the probe adjustable areas are arranged in an array mode, one probe is installed in each probe adjustable area, and a probe array is formed. According to the adjustable probe array device, a multi-probe linkage scheme is adopted according to the X/Y direction interval adjustment characteristic of each probe, interval adjustment driving is simpler, the number of motors required by a typical 2*4 array is reduced from 10 to 3, the system complexity is reduced while the compatibility is ensured, and the system reliability is improved; a hollowed-out integral probe supporting plate structure is adopted, so that the stability is better, and mutual collision among the probes is avoided; a multi-layer staggered wave-absorbing material design mode is adopted to ensure the full coverage of a wave-absorbing material in the probe spacing adjustment process, and avoid the influence on the measurement precision.
01 Sep 2002
TL;DR: In this paper, a novel highly linear circularly polarized active antenna with gain control is presented, where the antenna serves as a 90o hybrid and the active part has been implemented using a branch line coupler as the 90o input hybrid circuit, and two PHEMT based amplifiers.
Abstract: In this paper, a novel highly linear circularly polarized active antenna with gain control is presented. In this approach, the antenna serves as a 90o hybrid and the active part has been implemented using a branch line coupler as the 90o input hybrid circuit, and two PHEMT based amplifiers. The amplifiers are based on a new strategy for gain control with low distortion.
01 Dec 2009
TL;DR: In this study, the change in resonant frequency and phase distribution has been investigated using frequency tuning strategy within X-band frequency range and it is shown that the feasibility of reflectarray antenna of realizing electronic beam scanning is enhanced.
Abstract: Reconfigurable reflectarray antenna is one of the options proposed in this work that can be used as an active antenna in order to allow the change in the frequency of operation and hence, the dynamic phase control of resonant elements. The capability of realizing frequency tuning using slots embedded into patch elements is presented. In this study, the change in resonant frequency and phase distribution has been investigated using frequency tuning strategy within X-band frequency range. This further enhances the feasibility of reflectarray antenna of realizing electronic beam scanning. The results obtained from commercially available CST computer model demonstrate that the energy reflected with a minimum simulated reflection loss of −0.6233 dB Moreover, the maximum attainable phase range of 4.922 rad allows the beam to be scanned up to an angle of 26 degrees. Analysis of the frequency tuning capability of resonant elements using CST computer software will be integrated with measurement using waveguide simulator to show the reliability of the change in frequency and phase distribution.
Patent•
12 May 2016
TL;DR: In this paper, the authors proposed an active antenna system consisting of a plurality of digital-to-analog converters for converting the plurality of transmission signals corresponding to a first sector S1 and second sector S2, respectively.
Abstract: PROBLEM TO BE SOLVED: To provide an active antenna system whose cost can be reduced.SOLUTION: An active antenna system 3 comprises: a plurality of digital-to-analog converters 11 for converting a plurality of transmission signals corresponding to a first sector S1 and second sector S2, respectively; a plurality of distributors 13 for distributing each of the plurality of transmission signals converted by the plurality of digital-to-analog converters 11 into a plurality of transmission signals; a plurality of antenna elements 9 for transmitting the plurality of transmission signals obtained by the distribution of the plurality of distributors 13; a phase shifter 15 that is provided at a post stage of the distributors and performs phase adjustment on the transmission signals obtained by the distribution of the distributors 13; and phase shifters 15 (15a, 15b) that are provided between the plurality of distributors 13 and the plurality of antenna elements 9 and perform phase adjustment on the transmission signals obtained by the distribution of the plurality of distributors 13 so that the first sector S1 and second sector S2 are formed.SELECTED DRAWING: Figure 3
Patent•
27 Apr 2021
TL;DR: In this article, a method and device using a single transmitter (TX) and/or a single receiver (RX) is provided for determining an angle measurement between the transmitter and receiver for an ultra wideband (UWB) system.
Abstract: A method and device using a single transmitter (TX) and/or a single receiver (RX) is provided for determining an angle measurement between the transmitter and receiver for an ultra-wideband (UWB) system. A plurality of RX antennas is coupled to the receiver and a plurality of TX antennas is coupled to the transmitter. An IEEE 802.15.4z standard provides a silent period or gap before and after scrambled timestamp sequences (STS) in a frame. An active antenna is switched to a different antenna in the gaps. This allows the angle measurements to be performed with only a single transmitter and receiver within one channel impulse response (CIR) measurement cycle.