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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06 Sep 2010
TL;DR: A characteristic loop locus of dc power versus RF output power was observed as the frequency was varied around the optimum point of an operational active antenna, and it is now clear that the loop was formed as a consequence of the interaction of the transistor packaging elements with the patch impedances.
Abstract: A characteristic loop locus of dc power versus RF output power was observed as the frequency was varied around the optimum point of an operational active antenna. A new technique was introduced into the simulation, plotting the dependence of parameters such as supply current, efficiency or output power on internal impedance as seen by the naked transistor. It is now clear that the loop was formed as a consequence of the interaction of the transistor packaging elements with the patch impedances.
Patent•
15 Feb 2019
TL;DR: In this article, a method and a system for rapid diagnosis of a multi-channel active antenna based on phase scanning is presented, which is especially suitable for a condition of fewer phase shifting states.
Abstract: The invention discloses a method and a system for rapid diagnosis of a multi-channel active antenna based on phase scanning, which are especially suitable for a condition of fewer phase shifting states. A phase control matrix for controlling a transmitting state of a tested transmitting antenna is arranged, and meanwhile, a phase state of each channel during transmission of the multi-channel active antenna is changed, so that the number of measurements is effectively reduced, and the measurement time is reduced; and the system for measurement through a fixed point receiving antenna is arranged, so that the fault diagnosis efficiency of channel phase shifters of the multi-channel active antenna is greatly improved.
TL;DR: The second part of a two-part paper discusses two kinds common-caliber compound antennas techniques for active/passive guiding system and the better one in the scheme is pointed out finally in this paper.
Abstract: The second part of a two-part paper discusses two kinds common-caliber compound antennas techniques for active/passive guiding system. One is the triple-antenna compound technique which two spiral antennas are utilized to find the direction of a radiative source in passive amplitude-phase monopulse subsystem and the other is used in pulse-radar. The next is the double-antenna technique which one antenna is for passive amplitude-monopulse direction-finding and the another is for pulse-radar. The mutual influence among these antennas is analysed in details and the better one in the scheme is pointed out finally in this paper.
Patent•
21 Nov 2018
Abstract: Aspects of this disclosure relate to active antenna calibration. In some embodiments, a local oscillator signal can be injected into the receive path for misalignment measurement and calibration of the receive path, a transmit signal from a transmit path can be coupled to a receive path, and the transmit path can be calibrated relative to the receive path.
01 May 2018
TL;DR: The way of increasing of operation range of homodyne system of RFID and positioning is discussed, and it is proposed to use two microwave amplifiers at transponder design to use the one-port microwave amplifier and the regenerative microwave amplifier built in the antenna design.
Abstract: The way of increasing of operation range of homodyne system of RFID and positioning is discussed. It is proposed to use two microwave amplifiers at transponder design. The first is the one-port microwave amplifier (regenerative amplifier) and the second is the part of transponder's active antenna. This part of the active antenna is the regenerative microwave amplifier which is built in the antenna design. The operation of active antenna in receiving and transmitting modes is considered. These modes can be realized simultaneously. There is no need to implement the switching between these modes.