Topic
Reflective array antenna
About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.
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22 May 2016
TL;DR: In this paper, a prototype phased array IC with four transmitters, four receivers, and integrated LO generation was designed and fabricated in a 130nm SiGe BiCMOS technology.
Abstract: A prototype phased-array IC with four transmitters, four receivers, and integrated LO generation was designed and fabricated in a 130nm SiGe BiCMOS technology. Including LO phase shifter power consumption, the transmit array consumes 71mW per element with a per-element output power of +6.4dBm at 94GHz. The receiver array consumes 56mW per element, and achieves an RX element noise figure of 12.5dB at 94GHz. Integrated LO generation includes a 47GHz VCO, 2× frequency multiplier, 94GHz LO buffers, and a 32× CML divider chain. The transceiver has been integrated into a flip chip antenna module with four transmit and four receive antennas, and achieves TX and RX beam steering over a scan angle range of ±20°. Including LO and bias overhead power, the array has improved per-element power consumption compared with state-of-the-art 94GHz arrays, consuming only 106mW per TX channel and 91mW per RX channel, while achieving comparable performance and levels of integration.
21 citations
TL;DR: In this paper, a flat four-beam compact phased array antenna is designed using a circular array of four circular microstrip antennas made of low-cost material and four 1-bit phase shifters.
Abstract: This paper presents a flat four-beam compact phased array antenna. The low-cost and compact phased array antenna is designed using a circular array of four circular microstrip antennas made of low-cost material and four 1-bit phase shifters. The main beam of the antenna can be switched in four directions with the gain of about 4 dBi in each main-beam direction. More than 90/spl deg/ half-power beamwidth and over 10 dB F/B ratio are obtained. In addition, the diversity performance is considered and the diversity performance of this antenna can be provided with the envelope correlation about 0.6.
21 citations
Patent•
02 Dec 1991
TL;DR: In this paper, the rotary encoder generates a distance pulse every time the radar travels a presetted distance, and the radar controller sequentially generates three switching pulses within one period on the basis of the distance pulse from the rotor encoder.
Abstract: Subsurface target identification radar includes an antenna array, a rotary encoder, a radar controller, a polarization switching circuit, and transmitter and receiver circuits. The antenna array is constituted by dipole antennas having plane triangle elements. The antennas are disposed at angular intervals of 120° with respect to a rotated symmetric point of the array. The rotary encoder generates a distance pulse every time the radar travels a presetted distance. The radar controller sequentially generates three switching pulses within one period on the basis of the distance pulse from the rotary encoder. The polarization switching circuit selects an arbitrary dipole antenna as a transmitting antenna from the antenna array, selects an arbitrary dipole antenna, other than the selected antenna, as a receiving antenna, and changes a combination of selected antennas every time the switching pulse is generated by the radar controller. The transmitter and receiver circuits transmit/receive electromagnetic waves through the selected antennas.
21 citations
TL;DR: In this article, an orthogonally polarised stacked square microstrip patch array antenna structure with high-isolation performance was proposed for single channel full duplex wireless communications, where a double symmetric microstrip array structure was collaborated with a special self-interference cancelling network called differential feeding network (DFN) in order to achieve high isolation performance.
Abstract: An orthogonally polarised stacked square microstrip patch array antenna structure with high-isolation performance is proposed for single channel full duplex wireless communications. A double symmetric microstrip array structure is collaborated with a special self-interference cancelling network called differential feeding network (DFN) in order to achieve high-isolation performance. The proposed 2 × 2 and 4 × 4 symmetric array antenna structures with the DFNs were designed to operate at the idustrial, scientific and medical band of 2.34–2.54 GHz. By measurement, the average isolation performances of 53 and 60.7 dB were obtained in 200 MHz frequency band by the 2 × 2 and 4 × 4 array antennas, respectively. The measured average gains of the 2 × 2 and 4 × 4 array antennas were found to be 14.4 and 19.4 dBi, respectively.
21 citations
TL;DR: This paper provides a study of the effects of array geometry on the performance broadband array system and provides a method where the array geometry can be more easily optimized for different applications.
Abstract: The next generation radio telescopes such as the Square Kilometer Array (SKA) are expected to contain thousands of antenna array elements operating over a broad frequency range where the signals from each antenna element are combined and processed simultaneously providing high sensitivity with multiple beams providing a wide field of view. One crucial design aspect influencing both the performance and the cost of such systems is the array geometry. Due to the large bandwidth and number of broadband antenna elements, the optimization of such array system is difficult to achieve with the current array geometry optimization techniques which rely mainly on genetic algorithms and pattern search techniques. This paper provides a study of the effects of array geometry on the performance broadband array system. In addition, it provides a method where the array geometry can be more easily optimized for different applications. This is demonstrated for optimizing a typical SKA station in the frequency band between (70-450 MHz).
21 citations