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, an active patch array designed at 24 GHz is presented, which can be used as a front-end component for a phased array and achieves an EIRP of 34 dBm with total radiated power of 22dBm and a maximum PAE of 32%.
Abstract: This paper presents an active patch array designed at 24 GHz. It can be used as a front-end component for a phased array. A series resonant array structure is chosen which is compact and easy excite. With 5 elements, the array proved a 12-dB antenna gain. A power amplifier and a low noise amplifier are designed on a single GaAs chip (PALNA). Bias switch is used in the PALNA, which greatly reduces the switch loss in a transceiver and increases the efficiency. 20-dB small signal gain is achieved in both power amplifier and low noise amplifier. The active patch array is built by the combination of the patch array and PALNA. The measured active gain of this antenna is 35-dB for the PA mode and 31-dB for the LNA mode. This active patch array can obtain an EIRP of 34 dBm with a total radiated power of 22dBm and a maximum PAE of 32%. To check the noise performance, we applied sources at both normal temperature and 77K (liquid nitrogen) and extracted the noise figure (3.5 dB) of the active antenna by the Y factor method. The results proved that the active antenna is working efficiently as both a transmitting and receiving antenna.
23 citations
Patent•
22 Sep 1981
TL;DR: In this article, an active millimeter wave simulator for the evaluation of a target-sensor system is presented, where the seeker signals as received by the active antenna elements are supplied to a millimeter-wave spectrum analyzer for determination of their frequency.
Abstract: An active millimeter wave simulator for missile seeker evaluations wherein a missile seeker generates seeker signals and transmits them in the direction of an array of active antenna elements. Range timing signals are delayed in a time delay circuit to simulate a range between the missile seeker and a target. The seeker signals as received by the active antenna elements are supplied to a millimeter wave spectrum analyzer for determination of their frequency. A computer receives the determined frequency and controls a millimeter wave source to generate simulated target response signals with that same frequency but delayed in accordance with the time delay signal. The computer controls a master target control circuit to select a triad of antennas in the antenna array and to generate a phase center in the triad generating the target response signals. The millimeter wave spectrum analyzer further determines the frequency of the target response signals. The computer compares the frequencies of the target response signals and the missile seeker signals and controls the millimeter wave source to ensure correspondence between those frequencies.
23 citations
TL;DR: In this paper, a two-dimensional planar array of weakly coupled active circular patch antennas suitable for quasi-optical power combiners is discussed, and a novel radiating element that has low cross-polarization is described.
Abstract: This paper discusses two-dimensional planar arrays of weakly coupled active circular patch antennas suitable for quasi-optical power combiners. A novel radiating element that has low cross-polarization is described. A two-dimensional array analysis was developed to address radiation pattern and phase problems. Equivalent isotropic radiated power levels of 1.5 W for a two by two FET array and 3.8 W for a two by four FET array have been obtained at X-band. >
23 citations
TL;DR: In this paper, a polarisation-agile active antenna has been constructed and tested, which consists of two varactor diode loaded active patches using npn bipolar transistors in the common base configuration as sources.
Abstract: A polarisation-agile active antenna has been constructed and tested The radiation can be selected to be circularly polarised in either sense, or linearly polarised in the vertical, horizontal or either diagonal plane The antenna consists of two varactor diode loaded active patches using npn bipolar transistors in the common base configuration as sources, and with the patch axes at right angles to each other The two oscillators are locked to an external source, and the phase from each patch element is controlled by varying the diode bias voltage By appropriate combination of the phase relationships, the various polarisations are produced
23 citations
TL;DR: In this article, an effective wide-band (10 to 60 MHz) active antenna element has been developed, and the cost of one short (3 m), thin dipole with built-in amplifier and metal construction is less than 45 euro.
Abstract: An effective wide-band (10 to 60 MHz) active antenna element has been developed. The cost of one short (3 m), thin dipole with built-in amplifier and metal construction is less than 45 euro. It was shown both theoretically and experimentally that the upper limiting frequency is at least 60 MHz, the dynamic range is 90 dB/μV and the share of the amplifier noise to the background antenna temperature is about 10%. The developed active dipole was tested by building a 30-element antenna array and comparing its parameters with one of the subpart of the UTR-2 radio telescope having passive dipoles of 8.6 m in length and 1.8 m in diameter. The 3C461 ionospheric scintillation spectra observed in the experiments show that the sensitivities and noise-immunities of both antennas are close. This proves the availability using of a short cheap active dipole in new generation giant radio telescopes.
23 citations