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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Patent•
05 Jul 1995
TL;DR: In this paper, an active antenna rotation device is used for receiving radio frequency signals, and a rectifier is connected in series between the coaxial feeder and the antenna amplifier, so the rotation of an antenna can be controlled by a common feeder.
Abstract: The utility model discloses an active antenna rotation device, which is used for receiving radio frequency signals. The utility model is composed of an active antenna amplifier, a supply power in which the normal polarity of electric currents is variable, a rotation equipment for a direct current motor, etc. The utility model is characterized in that a switching device with direct current on and alternate current off is connected in series with a circuit which is composed of the rotation equipment for a direct current motor, a coaxial feeder, and the supply power; a rectifier is connect in series between the coaxial feeder and the antenna amplifier; so the rotation of an antenna can be controlled by a common feeder, meanwhile, the working power of the antenna amplifier and the radio frequency signals can be simultaneously transmitted. The utility model can be widely used for receiving signals for TV in places such as families, institutions, factories, mines, restaurants, etc.
2 citations
Journal Article•
TL;DR: In this paper, a new way of feeding single layer microstrip patch antenna to generate circular polarization using electromagnetically coupled microstrip T junction is proposed, which eliminates the need for capacitors in the RF path for active antenna applications in wireless local area network (WLAN).
Abstract: In this paper a new way of feeding single layer microstrip patch antenna to generate circular polarization using electromagnetically coupled microstrip T junction is proposed. The proposed antenna eliminates the need for capacitors in the RF path for active antenna applications in wireless local area network (WLAN). The simulated results using IE3D software were verified by measurement using the vector network analyzer.
2 citations
27 Jun 2002
TL;DR: In this article, the authors proposed a pseudo full duplex wideband multi-frequency band (X, Ku and K) phased array antenna with +/-27 degrees of the beam scanning, using a novel multi-line time delay phase shifter controlled by a piezoelectric transducer.
Abstract: High data rate networks are now being designed to rapidly exchange high value sensor and video information among various users located on the surface and airborne. Phased array antennas can provide rapid switching amongst the members in addition to the gain necessary to connect these members. For many applications, these antennas would be configured to either transmit or receive. Designing a phased array antenna that is full duplex significantly complicates the design because much of the emphasis in the design is placed on keeping the transmit energy out of the receive channel. A phased array antenna could be designed to receive only when the antenna is not transmitting; thus the design would only need to protect the receiver components during the transmission. The antenna would be then full duplex. This paper describes a small pseudo full duplex wideband multi-frequency band (X, Ku and K) phased array antenna with +/-27 degrees of the beam scanning, using a novel multi-line time delay phase shifter controlled by a piezoelectric transducer (PET). This antenna design is simple, and would use no more space than an antenna used solely for either transmit or receive. Also, some of the isolation between the transmit and receive channels is achieved using novel low-cost fabrication techniques.
2 citations
08 Sep 1997
TL;DR: Noise equivalent line lenigth is defined which unifies the contribution of noise from different array elements and is used in the design of a parallel feed structure and as an active circuit replacement criteria in passive arrays.
Abstract: In this work noise analysis of parallel feed structures for active antenna arrays are presented. Signal and noise behaviour of the feed structures are signified by the newly introduced concepts of "coherent" and "incoherent" impedance match of power combining structures. It is also shown that a feed structure can be re-designed for low noise operation without affecting its radiation characteristics. Optimum design of parallel feed structures for low noise operation is explained. Also an optimum use of active elements in such structures is investigated to have a low overall noise temperature of the antenna array with miniimum number of active elements. In the analysis a new method is introduced where a "noise equivalent line lenigth" is defined. This definition which unifies the contribution of noise from different array elements, is used in the design of a parallel feed structure and as an active circuit replacement criteria in passive arrays.
2 citations
03 Dec 2001
TL;DR: In this paper, a spherical array self-mixing oscillator antenna was designed and tested at a frequency of 10 GHz and the injection locking technique was applied to the spherical array, in which elements are made of simple waveguide radiators.
Abstract: Principle of a spherical array self-mixing oscillator antenna is discussed in this paper. Applying the injection locking technique to the spherical array, in which elements are made of simple waveguide radiators, beam steering with constant pattern in different directions can be achieved without using the sophisticated phase shifters. This antenna is designed and tested at a frequency of 10 GHz.
2 citations