Active antenna

About: Active antenna is a research topic. Over the lifetime, 2246 publications have been published within this topic receiving 26493 citations.

Noise Analysis and Measurement of Active Antenna

Abstract: The noise of an active receiving antenna is analyzed in this paper. The design criterion and some design consideration for short wave active receiving antenna is given. The method to measure the noise figure of the active receiving antenna is proposed. It is simple, efficient and no extra request for the detection performance of the measuring instrument. The experimental confirmation shown that this method is correct.

Performance Amelioration of an Active Integrated Spiral Antenna System for UWB Applications

Abstract: This paper describes the implementation of an active integrated spiral antenna for UWB (ultra-wideband) applications. By integrating a low-noise amplifier with antenna, the voltage standing wave ratio (VSWR) can be kept low for a large bandwidth and this antenna indicate a 13 dB improvement in gain compared with one using a passive antenna with the same design, resulting in an improved spiral antenna performance for UWB. For the designed circuit in the UWB frequency range (3.1-10.6 GHz), the gain of the LNA is better than 13 dB, its noise figure is less than 3 dB, S11 and S22 are less than -13 dB, respectively

Active antenna integrated with up converter for 5 to 24 GHz band

Abstract: Within research toward a new generation of in-door communication systems, utilization of frequencies in the higher microwave and lower MM-wave bands may play an important role in future. One of the barriers to fast market introduction is convenient inherently low cost RF front ends to be realized in planar technology, moreover with integrated antennas. In this paper, a solution for an up converter with an integrated antenna at 5 GHz (non-licensed/HIPERLAN band) to 24 GHz (ISM band) is presented. The results may also trace work on the future 100 GHz systems. A solution with a sector antenna is successfully implemented and described in more detail. The measured results have verified the proposed concept.

Intermodulation Interferences Immunity in Receiving Path of Active Antenna Array Based on NI USRP-2943 SDR Transceivers

Abstract: Active antenna array is formed out of coherently and synchronously functioning software defined radio reconfigurable NI USRP-2943 transceivers. An analysis of nonlinear properties of NI USRP-2943 RF receiver channels with specified microelectronics devices for coherent and noncoherent composition of intermodulation interferences at output of each RF stage is performed. Spatial correlation matrixes of the sum of active and intermodulation interferences for active antenna array are evaluated. The angular power spectrum dependence on the nonlinear distortion in USRP RF receiving path and spatial configuration of active antenna array is analyzed. Power levels and angular positions of virtual spatial interferences corresponding products of nonlinear transformation in receiving path are calculated as well.

Frequency reconfigurable active antenna

Abstract: The objective is to design a frequency reconfigurable active antenna which involves the integration of active device such as FET with a passive structure. Here the dual port dual band antenna is independently designed and later connected to one port amplifier using matching network. The passive antenna serves as radiator, frequency selector as well as feedback network for the oscillator. First the two port, dual band antenna is simulated in CST. Then the S parameters of the antenna were substituted in ADS as two port item. Here annular slot antenna with shorted slots was selected as radiator which was designed to resonate at 2.4 GHz and 5.2 GHz respectively. The antenna was connected to the amplifier, the active antenna was then simulated and the simulated results were validated through measurement. When tested the oscillator was found to oscillate at 2.097 and 4.576 respectively.