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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19 Jul 2015
TL;DR: This paper describes the design of an electronically-switched active antenna array for near-field microwave imaging of tissue in the range of 6 to 8 GHz, where each antenna element connects directly to a dedicated radio front-end, whose intermediate frequency output is fed to a common port for digital data processing.
Abstract: This paper describes the design of an electronically-switched active antenna array for near-field microwave imaging of tissue in the range of 6 to 8 GHz. Each antenna element connects directly to a dedicated radio front-end, whose intermediate frequency output is fed to a common port for digital data processing. In this way, the difficulties of designing reproducible microwave switching and feeding networks are avoided. Within each front-end, switched-bias low-noise amplifiers are used to maximize the difference in received power between the on and off states of the imaging sensors, thereby enhancing the dynamic range of the measurement.
2 citations
18 Jun 1995
TL;DR: A simple Doppler radar with tracking capability has been implemented using the active antenna concept, and if the free-running oscillating signals and the injection signal can be synchronized to produce an FM signal, the system is then capable of ranging as well.
Abstract: A simple Doppler radar with tracking capability has been implemented using the active antenna concept. The performance of the radar has been measured and found to be reasonable. If the free-running oscillating signals and the injection signal can be synchronized to produce an FM signal, the antenna main beam will be maintained at broadside and the system is then capable of ranging as well.
2 citations
Patent•
01 May 2002
TL;DR: In this article, a complex oscillator is fixed on the main antenna rod from top to bottom and is connected to the signal amplifier fixed at the bottom of the antenna rod, which can increase the coverage of TV signals and have high gain.
Abstract: The utility model provides an active antenna for TV which can increase the coverage of TV signals and have high gain. Complex oscillator is fixed on the main antenna rod from top to bottom and is connected to the signal amplifier fixed at the bottom of the main antenna rod. The signal amplifier is connected to the power supply and the signal coupling device. When the electricity power converter is on, the whole television antenna begins working, receiving TV signals of wide coverage and high gain. Thereby the effect of TV viewing is enhanced.
2 citations
Patent•
28 Aug 2018
TL;DR: In this article, the authors proposed a multi-system integrated active antenna, which consists of a first antenna system having a massive MIMO array; a second antenna system which has an antenna array and operates in a set network mode, wherein the second antenna is an active antenna system, and the set network modes is at least one of a 4G network type, a 3G network types, and a 2G network mode.
Abstract: The invention provides a multi-system integrated active antenna, and the antenna comprises a first antenna system having a Massive MIMO array; a second antenna system which has an antenna array and operates in a set network mode, wherein the second antenna system is an active antenna system, and the set network mode is at least one of a 4G network type, a 3G network type, and a 2G network type. The first antenna system and the second antenna system share one radome. The antenna provided by the invention achieves the integrated design of two or more antenna systems in a Massive MIMO array antenna system, is simple in structure, improves the compatibility of various types of communication systems, can simplify the base station configuration, greatly saves the antenna plane resources, reducesthe network planning difficulty, reduces the cost of an operator, and improves the maintenance convenience.
2 citations
TL;DR: In this paper, a multi-band single layer microstrip patch antenna with slots for GPS L2/L1, GLONASS receivers was designed, which achieved a VSWR (Voltage Standing Wave Ratio) of less than 2.0, RHCP(Right-Hand Circular Polarization) characteristics over the operating frequency bands of GPS L 2 (1,227.6 MHz)/L 1 (1.575 MHz) and GLONass(1,602 MHz), the maximum active antenna gain of more than 30 dB and the axial ratio of less
Abstract: In this paper, we have designed a multi-band single layer microstrip patch antenna with slots for GPS L2/L1, GLONASS receivers. The antenna has dual feed structure and consists of single layer microstrip patch with slots and impedance matching circuit. The antenna specifications are a VSWR(Voltage Standing Wave Ratio) of less than 2.0, RHCP(Right-Hand Circular Polarization) characteristics over the operating frequency bands of GPS L2(1,227.6 MHz)/L1(1,575.42 MHz) and GLONASS(1,602 MHz), the maximum active antenna gain of more than 30 dB and the axial ratio of less than 3 dB. The antenna has been successfully evaluated by various tests.
2 citations