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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03 Dec 2010
TL;DR: A statistical analysis of the impact of phase- and amplitude-distortions on the performance of active antenna arrays for mobile communication base stations is presented and it is shown, that the required accuracy can be achieved with standard RF-circuit design and components.
Abstract: In this paper a statistical analysis of the impact of phase- and amplitude-distortions on the performance of active antenna arrays for mobile communication base stations is presented. The cause and influence of different contributors to these distortions is described and the allowable phase- and amplitude-margins that need to be reached for mobile communication base station applications are derived. Finally a test setup of a distributed active antenna is implemented and it is shown, that the required accuracy can be achieved with standard RF-circuit design and components.
2 citations
08 Jun 2003
TL;DR: In this article, a V-band strongly coupled single-chip MMIC oscillator array is presented to reduce the MMIC chip size and increase the output power of the millimeter-wave source module.
Abstract: In this paper, a V-band strongly-coupled single-chip MMIC oscillator array is presented. To reduce the MMIC chip size and increase the output power of the millimeter-wave source module, the output powers of the four oscillators are combined in a single chip using a four-port patch antenna. A parallel combination of the two pairs of the oscillators operating in a push-pull mode was implemented using a single four-port patch antenna. When measured in a closed over-sized waveguide, the circuit showed the output power of 3.8dBm at 60.626GHz. The measured radiation pattern of the active antennas array in free space shows broadside pattern with low cross-polarization level, verifying that the current profile on the antenna closely follows that of the ideal push-pull mode. The proposed active antenna approach is a promising candidate for a low-cost source module at mm-waves.
2 citations
TL;DR: In this paper, a single layer, CPW-fed, patch scanning array architecture using injection locking at 9.83 GHz is presented, where the patch antennas are printed on the front side of the substrate while the electronics are situated at the back side leading to a simple and compact design.
Abstract: A compact, single layer, CPW-fed, patch scanning array architecture using injection locking at 9.83 GHz is presented. The patch antennas are printed on the front side of the substrate while the electronics are situated at the back side leading to a simple and compact design. The unit element for the array is a self oscillating active patch antenna with a GaAs FET centered behind the patch for tight packing. The feedback for the oscillator is provided through electromagnetic coupling using a twin-slot arrangement behind the patch. A low power control signal is injected through parasitic coupling at the CPW side of the circuit. Phase shifting of the elements is achieved by electronically adjusting the gate voltage of the GaAs FETs. A scan range of -12/spl deg/- +9.5/spl deg/ is obtained for a four element prototype array.
2 citations
Patent•
30 Mar 1981
TL;DR: In this article, the authors proposed to make stable receiving possible even if a receiver unprocessed for intermodulation interference and multipath interference is used, by connecting the system output to the antenna terminal of the receiver simply.
Abstract: PURPOSE:To make stable receiving possible even if a receiver unprocessed for intermodulation interference and multipath interference is used, by connecting the system output to the antenna terminal of the receiver simply CONSTITUTION:The receiving signal dependent upon receiving part 1 is applied to low-noise high-frequency amplifying circuit 3 through matching circuit 2 for impedance matching This circuit 3 is constituted with the amplifier of a low-noise factor The amplification output is mixed with the local oscillation signal of a prescribed frequency from local oscillation signal generating circuit 5 by mixing circuit 4 Band pass filter 6 is provided which leads out selectively only the prescribed- frequency signal from this mixed output This frequency-converted output becomes an unbalanced output due to impedance converting circuit 7 By the variable operation of the signal frequency of local oscillation signal generating circuit 5, namely, the tuning operation, impedances and frequency selection characteristics of circuits 2 and 3 are interlocked with each other and are controlled variably
2 citations
TL;DR: A practical method using current transformers is proposed for controlling the current distribution and a grounding system using this method has the property that it does not short out adjacent active antenna cables when it is in standby mode.
Abstract: A solution is obtained to the problem of finding the current distribution in a buried linear antenna which minimizes the dissipated power while maintaining the required radiated field. An example shows that such distribution saves about 30 percent on power dissipation compared to an antenna of the same total length having simple bared-end grounding terminations. A practical method using current transformers is proposed for controlling the current distribution. A grounding system using this method has the property that it does not short out adjacent active antenna cables when it is in standby mode.
2 citations