Topic
Active antenna
About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.
Papers published on a yearly basis
Papers
More filters
13 Dec 2012
TL;DR: In this paper, the design, electric circuit and some results of experimental and theoretical researches are given and described for the subarray of the giant Ukrainian Radio Telescope (GURT) in the decameter wavelength range.
Abstract: The decameter wavelength range is of interest for radio astronomy at the present time. Construction of giant low-frequency radio telescopes has been planned and is being carried out in European Union (Low Frequency Array - LOFAR), USA (Long Wavelength Array - LWA) and in Ukraine (Giant Ukrainian Radio Telescope - GURT). The radio telescope GURT, which is being created in the Institute of Radio Astronomy of NAS of Ukraine, will operate over frequency range from 10 to 70 MHz. The antenna system of telescope will be a phased antenna array consisting of many subarrays, each of 5×5 elements. The array element is an active crossed dipole with inclined arms. Phasing inside one section is performed with analog phase shifter. Output signals of the subarrays are transformed into digital form and are processed in DSP-receiver. In this paper the subarray of the GURT radio telescope is considered. The design, electric circuit and some results of experimental and theoretical researches are given and described.
22 citations
TL;DR: In this article, a dual-FET active patch antenna element and arrays for quasi-optical power combining are described, which uses two FET's that symmetrically load a split patch antenna.
Abstract: A novel dual-FET active patch antenna element and arrays for quasi-optical power combining are described. The circuit uses two FET's that symmetrically load a split patch antenna. The configuration of the devices decreases H-plane cross-polarization dramatically. The power combining was achieved by injection locking through mutual coupling. An equivalent isotropic radiation power of 0.88 W for a 2-element dual-FET patch antenna array has been obtained. For a 2/spl times/2 array, an equivalent isotropic radiated power of 2.99 W was achieved. The circuit is planar and amenable to monolithic circuits. >
22 citations
Patent•
27 Oct 2000
TL;DR: In this paper, a system and method of augmenting existing and operational base stations to include multiple diversity schemes and to render passive antenna elements active is presented, where the passive antenna array of the existing base station is replaced with an active antenna array, consisting of an active radiator unit that includes an array of both receive and transmit antenna elements.
Abstract: A system and method of augmenting existing and operational base stations to include multiple diversity schemes and to render passive antenna elements active is presented herein. The passive antenna array of the existing base station is replaced with an active antenna array, consisting of an active radiator unit that includes an array of both receive and transmit antenna elements. The transmit and receive antenna elements of the active radiator unit, respectively, are connected to transmit amplifiers and bandpass filters located at a masthead or at the top of the building.
22 citations
TL;DR: In this article, an FET was integrated with a cavity-enclosed inverted stripline patch antenna for low-cost microwave source operating at 5.69 GHz with an output power of 57 nW.
Abstract: An FET has been integrated with a cavity-enclosed inverted stripline patch antenna. This low-cost microwave source operates at 5.69 GHz with an output power of 57 nW. The half-power beamwidths in the E- and H-plane patterns are 46 and 64 degrees , respectively. The crosspolarisation level is nearly 20 dB down from the maximum. >
22 citations
Patent•
18 Mar 2009TL;DR: An active antenna, a base station, a method for refreshing the amplitude and phase, and a signal processing method are disclosed to simplify the structure of a phase shifter and guarantee the reliability of the phase shifters as mentioned in this paper.
Abstract: An active antenna, a base station, a method for refreshing the amplitude and phase, and a signal processing method are disclosed to simplify the structure of a phase shifter and guarantee the reliability of the phase shifter. The active antenna or the base station includes an antenna dipole array, a transceiver array, a digital processing unit (DPU), and a transceiving calibration unit. During signal reception, the transceiver demodulates a radio frequency (RF) signal of the antenna dipole into an IQ analog signal, and outputs the IQ analog signal to the DPU; the DPU converts the demodulated IQ analog signal into an IQ digital signal, and performs digital beam forming (DBF) on the IQ digital signal according to the transceiving calibration unit; during signal transmission, the transceiver modulates the IQ analog signal of the DPU into an RF signal, and outputs the RF signal to the antenna dipole; the DPU converts a signal of a base band unit (BBU) into an IQ digital signal in serial/parallel (S/P) mode, and performs DBF on the IQ digital signal according to the transceiving calibration unit.
22 citations