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 method for accurate modeling of a reflector antenna system with a wideband phased array feed is presented and used to study the effects of the number of active antenna elements and associated receiving channels on the receiving sensitivity of the antenna system.
Abstract: A method for accurate modeling of a reflector antenna system with a wideband phased array feed is presented and used to study the effects of the number of active antenna elements and associated receiving channels on the receiving sensitivity of the antenna system. Numerical results are shown for a practical design named APERTIF that is currently under developed at The Netherlands Institute for Radio Astronomy (ASTRON).
1 citations
Proceedings Article•
16 Jun 2010
TL;DR: In this paper, the results of antenna radiation pattern measurements on a tower setup are shown and a Control and Diagnostic System is described as well as a control and diagnostic system is described.
Abstract: The paper presents realization, mechanical solution and measurements results of transmit and receive systems used in the Demonstrator of S-band Active Antenna. The transmit system contains T/R modules, where individual module supplies half of antenna row of planar array. The 16 antenna rows form in elevation plane cosecant squared type transmit antenna pattern and fin-beam receive antenna pattern. In azimuth plane, pencil-beam radiation pattern is formed. Five elevation positions of the receive beam is electronically set by means of digital phase shifters and attenuators applied in a receive beam forming network. The results of antenna radiation pattern measurements on a tower setup are shown. Additional information about a Control and Diagnostic System is described as well.
1 citations
Patent•
10 Jun 2009
TL;DR: In this article, a GPS active antenna device is described, which consists of a printed circuit board, a spiral antenna, an amplify filter circuit, a shielding shell, a radio frequency cable, radio frequency connector and an antenna extension unit.
Abstract: The utility model discloses a GPS active antenna device, which comprises a printed circuit board, a spiral antenna, an amplify filter circuit, a shielding shell, a radio frequency cable, a radio frequency connector and an antenna extension unit, wherein the printed circuit board is equipped with a printed circuit, and the spiral antenna, the amplify filter circuit and the shielding shell are welded on the printed circuit board. One end of the radio frequency cable is connected with the printed circuit board, the other end of the radio frequency cable is connected with the radio frequency connector, one end of the antenna extension unit is connected or coupled with the printed circuit board, and the other end of the antenna extension unit is hung in the air. The GPS active antenna device has small volume and excellent performance, thereby increasing the signal strength, and greatly improving the noise status.
1 citations
01 Aug 2018
TL;DR: The development of a flexible printed active antenna for the digital television (DTV) reception in areas having poor signal or in high-rise buildings is presented and could be useful for various specific applications.
Abstract: This paper presents the development of a flexible printed active antenna for the digital television (DTV) reception in areas having poor signal or in high-rise buildings. The antenna structure is composed of a meander line printed on a polyimide film as a radiating element. It has a thickness of 0.3 mm, highly flexible, and very lightweight. The design and analysis of the radiating element are based on a full-wave method implemented by a commercial electromagnetic simulation software. The amplifier circuit consisting of a surface-mount transistor and passive components are integrated directly on the polyimide film, residing next to the feedline, to improve the antenna performance and minimize the whole antenna dimension. The impedance matching between the radiating element, the feed line, and the active circuit are considered. The measured results show that the return loss of more than approximately 10 dB, the maximum gain of about 18 dB, and the Omni-directional radiation pattern are achieved in the operating frequency band of 510–790 MHz. Due to its flexibility, low profile, lightweight, and additional gain, the proposed antenna could be useful for various specific applications.
1 citations