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, a 28 GHz end-fire active antenna with a secondary, circularly polarized patch antenna for reception of an external injection-locking signal is described, and three of these devices are used to characterize an octagonal cylindrical reflector designed for creating an omni-directional transmitter suitable for use in point-to-multipoint communication systems.
Abstract: A 28-GHz endfire (modified Vivaldi) active antenna is described that contains a secondary, circularly polarized patch antenna for reception of an external injection-locking signal. Three of these devices are used to characterize an octagonal cylindrical reflector designed for creating an omni-directional transmitter suitable for use in point-to-multipoint communication systems. The experiments provide data that validates the approach used to simulate the azimuthal radiation patterns. These simulations are then extended to predict the patterns from a full eight-element array.
2 citations
04 Dec 2005
TL;DR: The RF front end for BeiDou system is manufactured and tested, and the measurement results agree well with the simulation and satisfy the system requirements.
Abstract: A RF front end for the unique BeiDou satellite navigation system of China is designed It consists of an RF receiver module and an active antenna The highly integrated RF receiver module is designed based on single conversion scheme, a high performance band-pass IF filter is designed to fulfill the rigorous requirement of the system bandwidth For the active antenna module, a single-fed circular polarization microstrip patch antenna is designed, and a low noise amplifier is designed to overcome the loss of transmission cable between antenna and RF receiver module The RF front end for BeiDou system is manufactured and tested The board size of RF module is 70mm /spl times/ 40mm, and the diameter of active antenna is 65mm The measurement results agree well with the simulation and satisfy the system requirements
2 citations
21 Nov 2004
TL;DR: In this paper, the design of an active antenna with micromachined parts, suitable for use in a millimeter-wave system, is described, which can be combined with MEMS-based phase shifters or switches in an array to obtain superior performance.
Abstract: The design of an active antenna with micromachined parts, suitable for use in a millimeter-wave system, is described. Such antennas can be combined with MEMS-based phase shifters or switches in an array to obtain superior performance. To verify the design, models at 35 and 18.5 GHz on RT-duroid substrate instead of micromachined silicon, are fabricated and the performance is shown to be satisfactory.
2 citations
12 Jun 2005
TL;DR: A broadband lumped-element circuit model is developed for an array of aperture-coupled patch antennas and it is demonstrated that the mutual coupling can be significantly reduced by adjusting the electrical distance between the amplifier and the antenna phase center.
Abstract: This paper discusses the reduction of mutual coupling in active antenna arrays. A broadband lumped-element circuit model is developed for an array of aperture-coupled patch antennas. This allows simulating and optimizing the mutual coupling in a standard circuit simulator. Experimental results at 5.5 GHz demonstrate that the mutual coupling can be significantly reduced by adjusting the electrical distance between the amplifier and the antenna phase center. This simple technique proved to be useful especially for active antenna arrays based on standard MMIC amplifiers.
2 citations
01 Jul 2019
TL;DR: The main goal of this work is to analyse the viability of spatial modulation as a technology to implement and support future 5G systems that are currently being developed and investigate the performance of SM-CDMA and SM-OFDM- CDMA architectures in such frequency selective channels.
Abstract: Multiple-antenna techniques constitute a key technology for modern wireless communications, which establishes a trade-off between the data reliability and the data rate, and which may result in an increased system complexity and cost. Among the many transmission architectures which exploit multiple-antenna at either the transmitter, the receiver, or both, spatial modulation (SM) is a novel and recently proposed multiple-antennas transmission technique which can offer, with a very low system complexity, improved data rates compared to Single Input Single Output (SISO) systems, and robust error performance even in correlated channel environments. This is achieved by adopting a simple but effective coding mechanism that sets a one-to-one mapping between blocks of information bits to be transmitted and the spatial positions of the active antenna in the antenna array. The main goal of this work is to analyse the viability of spatial modulation as a technology to implement and support future 5G systems that are currently being developed. Since these systems will be deployed in frequency selective channels resulting from the targeted high data rates, and in the presence of multiple users, techniques such as orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA) may be involved. Hence, our objective is to investigate the performance of SM-CDMA and SM-OFDM-CDMA architectures in such frequency selective channels.
2 citations