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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
John C. Reed1
03 Apr 2002
TL;DR: In this paper, an improved vehicle radar system and control aids the vehicle driver during both parking and back-up maneuvers, which is equipped with both long range and short range radar detection antennas, an RF switch for selecting the active antenna, and a range bin having a depth that is adjustable "on the fly".
Abstract: An improved vehicle radar system and control aids the vehicle driver during both parking and back-up maneuvers. The radar system is equipped with both long range and short range radar detection antennas, an RF switch for selecting the active antenna, and a range bin having a depth that is adjustable “on the fly”. The back-up aid function is provided by activating the RF switch to select the long range antenna and setting the range bin to a relatively large depth to cover the long range in a short time. The parking aid function is provided by activating the RF switch to select the short range antenna, and setting the range bin to a relatively short depth to achieve high close range accuracy.

40 citations

Journal ArticleDOI
TL;DR: In this paper, an X-band antenna array with integrated silicon germanium low noise amplifiers and 3-bit phase shifters was successfully integrated onto an 8 × 2 lightweight antenna utilizing a multilayer liquid crystal polymer (LCP) feed substrate laminated with a duroid antenna layer.
Abstract: This paper presents for the first time an X-band antenna array with integrated silicon germanium low noise amplifiers (LNA) and 3-bit phase shifters (PS). LNAs and PSs were successfully integrated onto an 8 × 2 lightweight antenna utilizing a multilayer liquid crystal polymer (LCP) feed substrate laminated with a duroid antenna layer. A baseline passive 8×2 antenna is measured along with a SiGe integrated 8×2 receive antenna for comparison of results. The active antenna array weighs only 3.5 ounces and consumes 53 mW of dc power. Successful comparisons of the measured and simulated results verify a working phased array with a return loss better than 10 dB across the frequency band of 9.25 GHz-9.75 GHz. A comparison of radiation patterns for the 8×2 baseline antenna and the 8×2 SiGe integrated antenna show a 25 dB increase in gain (ΔG). The SiGe integrated antenna demonstrated a predictable beam steering capability of ±41°. Combined antenna and receiver performance yielded a merit G/T of -9.1 dB/K and noise figure of 5.6 dB.

40 citations

Patent
21 Jul 1997
TL;DR: An active microwave antenna (AM) as mentioned in this paper is a two-port micropatch antenna which receives signals having a first circular polarization and transmits signals of opposite circular polarization, and includes an integrated active circuit for amplifying and filtering the signal.
Abstract: An active microwave antenna device includes a two-port micropatch antenna which receives signals having a first circular polarization and transmits signals of opposite circular polarization. The device includes an integrated active circuit for amplifying and, optionally, filtering the signal. An array of such devices can be formed on a single substrate, each device being an independent active antenna, thus eliminating the need for RF or IF feed networks between the devices. Such arrays are believed to be particularly suitable for spatial power combining, rapid beam scanning, microwave imaging, frequency-polarization selective processes, and other related applications. The arrays may be either reflective or transmissive.

40 citations

Patent
02 Mar 2012
TL;DR: In this article, a radio base station (12) is connected to an active antenna array of a first number of active transmitting antennas, which each active transmitting antenna comprises sub elements.
Abstract: Embodiments herein relate to a method in a radio base station (12) for transforming a data transmission signal in a radio communications network. The radio base station (12) is connected to an active antenna array of a first number of active transmitting antennas, which each active transmitting antenna comprises sub elements. The radio base station (12) comprises a precoder codebook comprising precoders for transmitting signals in a diversified manner for a second number of antenna ports. The radio base station serves a user equipment in the radio communications network. The radio base station (12) precodes the data transmission signal with a precoder selected from the precoder codebook. The radio base station (12) furthermore transforms, linearly, the precoded data transmission signal by neutralizing a direction of the precoded data transmission signal and then directing the precoded data transmission signal vertically. The precoded data transmission signal is thereby enabled to be vertically adjusted towards the user equipment (10).

40 citations

Proceedings ArticleDOI
28 Oct 2010
TL;DR: In this paper, the authors present an overview of recent research at the University of Colorado, Boulder, in the area of passive and active antenna arrays, specifically, micro-coaxial array feed components, fabricated in the Nuvotronics PolyStrata™ process, as a means to miniaturized phased array.
Abstract: This paper presents an overview of recent research at the University of Colorado, Boulder, in the area of passive and active antenna arrays. Specifically, micro-coaxial array feed components, fabricated in the Nuvotronics PolyStrata™ process will be discussed as a means to miniaturized phased array. Performance of broadband Wilkinson dividers covering 2–22GHz (11:1 bandwidth) implemented in micro-coaxial lines for active transmit arrays is presented along with assembly methods for standard surface-mount resistors within the micro-coaxial environment. Integration of active devices with micro-coaxial components for 20W transmitters covering the 4–18GHz band is shown, and challenges associated with high power densities and interconnect parasitic are addressed. Ka-band (38 GHz) hybrids resulting in a 4×4 Buttler matrix with patch-like antennas integrated in PolyStrata™are presented. The high-performance micro-coaxial environment is highlighted with its advantages and potential limitations. Frequency-scanned array designs for W and G-band operation are compared for PolyStrata™ micro-coaxial and waveguide-fed arrays. Finally, several other related approaches, including spatially-fed beam-forming arrays, are overviewed.

40 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202148
2020113
2019123
201898
201789
2016102