Active antenna

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

Power amplifier based integrated and miniaturized active antenna

Abstract: In this paper, a power amplifier (PA) integrated active antenna is presented. A new approach to antenna miniaturization is introduced through the direct integration and co-design with the amplifier. The detailed design procedure is presented and the concept is demonstrated with a rectangular patch antenna. The PA and the antenna are co-designed so that optimum performance is achieved. The antenna is miniaturized from its nature resonance frequency 2.95 GHz to 2.45GHz which is 31% size reduction. The bandwidth of the antenna is found to be 37MHz and its efficiency is more than 50% when operating between 2.43–2.467GHz. The gain and noise figure of the amplifier are optimized along with the antenna performance as an active integrated antenna (AIA) system and found to be around 8 and 2dB respectively across the operating band.

A Joint Design of MIMO-OFDM Dual-Function Radar Communication System Using Generalized Spatial Modulation

Abstract: A novel dual-function radar communication (DFRC) system is proposed, that achieves high target resolution and high communication rate. It consists of a multiple-input multiple-output (MIMO) radar, where only a small number of antennas are active in each channel use. The probing waveforms are orthogonal frequency division multiplexing (OFDM) type. The OFDM carriers are divided into two groups, one that is used by the active antennas in a shared fashion, and another one, where each subcarrier is assigned to an active antenna in an exclusive fashion (private subcarriers). Target estimation is carried out based on the received and transmitted symbols. The system communicates information via the transmitted OFDM data symbols and the pattern of active antennas in a generalized spatial modulation (GSM) fashion. A multi-antenna communication receiver can identify the indices of active antennas via sparse signal recovery methods. The use of shared subcarriers enables high communication rate. The private subcarriers are used to synthesize a virtual array for high angular resolution, and also for improved estimation on the active antenna indices. The OFDM waveforms allow the communication receiver to easily mitigate the effect of frequency selective fading, while the use of a sparse array at the transmitter reduces the hardware cost of the system. The radar performance of the proposed DFRC system is evaluated via simulations, and bit error rate (BER) results for the communication system are provided.

Active antenna array and method for relaying radio signals with synchronous digital data interface

Abstract: The present disclosure relates to an active antenna array for a mobile communications network. The active antenna comprises a base band unit coupled to a base station, a plurality of transceiver units and at least one link. The plurality of transceiver units is terminated by at least one antenna element. The at least one link couples individual ones of the plurality of transceiver units to the base band unit 10 . The at least one link is a digital link and is adapted to relay an individual transmit signal concurrently and in synchronisation with a transmit clock signal. The present disclosure further teaches a method for relaying radio signals in a mobile communications network. The present disclosure further relates to a computer program enabling a computer to manufacture the active antenna array of the present disclosure and to execute the method of relaying radio signal in a mobile communications system.

Multi-chip millimeter-wave interface

Abstract: Systems and methods are provided for millimeter-wave (MMW) communication, the system includes a transceiver chip to generate and to receive signals An interface is used to communicate the signals between the transceiver chip and one or more active antenna modules The signals include modulated MMW signals and control signals The transceiver chip includes baseband circuitry, up and down conversion mixers, and RF front-end circuitry An active antenna module receives a first modulated MMW signal from the interface for transmission via antennas and to receive a second modulated MMW signal from the antennas for transmission through the interface to the transceiver chip