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 article, a packaged microwave bipolar transistor was integrated directly onto a rectangular microstrip patch to obtain extra power gain and to reduce power losses, and the radiating element geometry was modified to incorporate the active devices.
Abstract: A packaged microwave bipolar transistor has been integrated directly onto a rectangular microstrip patch to obtain extra power gain and to reduce power losses. The radiating element geometry has been modified to incorporate the active devices. This active antenna uses a small number of components and takes the same place as a passive antenna. An extra gain of 8dB is obtain at 1.68 GHz.
36 citations
TL;DR: In this paper, a compact microstrip-T coupled patch antenna for dual polarisation and active antenna applications is proposed for both dual polarization and active antennas applications, which is suitable for both active and passive applications.
Abstract: Compact microstrip-T coupled patch antenna for dual polarisation and active antenna applications
36 citations
01 Dec 2009
TL;DR: In this paper, a load-network solution to implement the transmission-line inverse Class F power amplifier for WCDMA active antenna array applications is presented based on an analytical derivation of the optimum load network parameters to control the second and third harmonic at the device output including the output parasitic shunt capacitance and series inductance.
Abstract: In this paper, a novel load-network solution to implement the transmission-line inverse Class F power amplifier for WCDMA active antenna array applications is presented. The theoretical analysis is based on an analytical derivation of the optimum load-network parameters to control the second and third harmonic at the device output including the device output parasitic shunt capacitance and series inductance. For an inverse Class F power amplifier based on a Nitronex GaN HEMT NPTB00004 with hybrid microstrip implementation, the simulated output power of 37 dBm and power-added efficiency of more than 70% are achieved at a supply voltage of 25 V in a frequency bandwidth of 2.11 to 2.17 GHz. The test board with implemented inverse Class F GaN HEMT power amplifier has been measured and high-performance results with drain efficiencies of about 80% and higher were achieved across the wide ranges of bias supply voltages and operating frequencies.
36 citations
01 Oct 2008
TL;DR: In this paper, a distributed amplifier integrated with a CRLH leaky wave antenna is proposed to coordinate the phase between the guided slow-wave in the microstrip section and fast-waving in the radiator, the length of the unit cell of the micro-strip section is shortened and FETs are connected with a constant phase coupling line.
Abstract: We propose a distributed amplifier integrated with a CRLH leaky wave antenna This active antenna uses the interdigital capacitor-based CRLH transmission line, microstrip line and FETs To coordinate the phase between the guided slow-wave in the microstrip section and fast-wave in the CRLH radiator, the length of the unit cell of the microstrip section is shortened and FETs are connected with a constant phase coupling line The signal travels to each unit-cell through FETs and radiate from the CRLH antenna This antenna radiates an amplified forward wave in the right hand region and an amplified backward wave in the left hand region A 5 unit-cell prototype demonstrates the proposed active leaky wave antenna The measured and simulated forward and reverse gains exhibit good agreement, and beam scanning can be observed
36 citations
TL;DR: The methodology and the results of the in-orbit verification with an achieved accuracy of better than ±0.2 dB are reviewed in this paper in detail, showing its outstanding accuracy.
Abstract: The high flexibility and tight accuracy requirements of modern spaceborne synthetic aperture radar (SAR) systems require innovative technologies to calibrate and process SAR images. To perform accurate pattern correction during SAR processing, an antenna model can be used to derive the multitude of different antenna beams generated by active antenna steering. The application of such an antenna model could be successfully demonstrated for the TerraSAR-X mission, launched in 2007. The methodology and the results of the in-orbit verification with an achieved accuracy of better than ±0.2 dB are reviewed in this paper in detail, showing its outstanding accuracy. Additionally, the results of the antenna pattern long-term monitoring are described, pointing out the high stability of the system.
36 citations