Active antenna

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

Transmission line model for longitudinal slot dielectric-filled waveguide

Abstract: The slot waveguide finds many applications such as radar and communication systems, which require narrow-beam or shaped-beam radiation pattern. Resonant arrays have the added advantage of presenting very low transmission loss and low cross-polarization, typically in millimeter waves. Others advantages are the low profile, the compactness and the light weight of the antenna. To improve this one and to reduce the cost of the antenna, technologies have been developed, based on foam metallization. So the waveguide is filled with dielectric, which is taken into account in the analysis. Theoretical results using this method show a good agreement with both CST Microwave Studio ones and measurements obtained by experiment in the laboratory. Offset slot effects and waveguide permittivity are taken into account. This method, based on the lossy transmission line, is very flexible and can be extended to various shapes like tilted slot or transversal slotted waveguide on the broad face or even in narrow wall of the waveguide. However the most interesting application may be the implementation of the components model on the method for active antenna, such as scanning beam antennas.

Surface mount end-fire antenna package

Abstract: A novel low-cost package concept is presented whereby an end-fire antenna module can be surface mounted such that it radiates in a direction normal to the backplane to which it mounts. The packaging method features the use of conducting castellations in the edge of the multilayer antenna module to form a very broad band transition. An example transition is described and measurements of a prototype presented. Applications to Vivaldi-type active antennas are presented.

Novel FPGA based T/R Module Controller for Active Phased Array Radar

Abstract: The current state-of-art technologies being researched upon globally for the various functionalities like Radar, Communication, Electronics Warfare, etc., have super components that performs similar functionalities. The Active Antenna Array Unit of modern Active Phased Array Radars consists of Radiating elements, Transmit/Receive (T/R) Modules and associated RF & Digital electronics. This paper explores the existing technologies and suggests improvements for the development of futuristic Active Phased Array Radars. FPGA based T/R Module Controller (TRMC) interfaces with the higher level controller over the Low Voltage Differential Signaling. The TRMC which controls $T$ /R module is internally divided into three major sub blocks namely the Universal Asynchronous Receiver/Transmitter (UART) logic, Decoding logic and Control logic. The controller also provides real time status of critical components of the T/R Module, such as DC power supply temperature, forward power monitoring, reverse power monitoring etc. In proposed architecture we have used suitable Xilinx FPGA and achieved a switching time of <50ns. The realized unit has improved efficiency, reliability and compact without compromising the electrical parameters of T/R Module functionalities. Modern long range Active Array Radar systems are built with large number of solid state T/R Modules for realization of high power aperture product. These radars with multi-function capability require faster target update rates as well as low side lobe levels. For realization of large power aperture multiple T/R Modules are packaged in a single housing. The electronic scanning as well as low side lobe levels are achieved by controlling phase and amplitude of T/R Modules distributed in Active phased Array Radars. As a part of research, several TRMs have been realized, tested, qualified and integrated successfully with the Active Phased Array Radar.

Antenna on board package for 5G millimeter wave phased array antenna

Abstract: In order to meet the needs of 5G communication, 5G millimeter wave phased array antenna vehicle components are developed. The traditional phased array antenna technology is mostly based on the building block transceiver or tile transceiver module of discrete devices. Using traditional MCM technology, it is difficult to realize thin, homomorphic and modular phased array antenna due to its complex process, high cost and large thickness. Therefore, simplifying the topology of phased array antenna and realizing thinning and modularization are the main trends of phased array antenna development. The highly integrated 64 element active antenna integrates 64 element broadband array antenna, microwave feed network, wave control network and power supply network with high integration. The millimeter wave active phased array antenna module developed for 5g millimeter wave communication is innovative and unique. Multi functional antenna board is used to integrate antenna array, feed network, power supply network and wave control network. Silicon based multi-functional transceiver chip is used to integrate transceiver channel, simplify antenna transceiver link, reduce antenna thickness, improve antenna productivity and reduce antenna loss. Antenna cost meets the requirements of high integration, modularization, easy assembly, low cost and strong scalability, and can meet the requirements of 5g millimetre The demand of meter wave communication.The on-board antenna is in the form of microstrip antenna. The whole on-board microstrip antenna consists of seven layers. It is fed by a stripline and coupled to the main patch antenna through an H-shaped through-hole. A layer of dielectric and parasitic patch antenna are added to the upper layer of the main patch antenna, which can expand the bandwidth to meet the requirement of 5g broadband. The feed network is a signal synthesis network that provides beamforming for the on-board phased array antenna. The feeding network adopts the structure of Wilkinson power divider with stripline, which has the advantages of miniaturization, lightweight and high reliability.The millimeter wave phased array antenna on board is tested. The results show that the normalized emission scanning pattern has good pattern characteristics in the range of ± 45 degrees, and the side lobe level is lower than - 12dB. The EIRP value is greater than 51 dBm. In the range of ± 45 degrees, the cross polarization isolation of on board phased array antenna is better than -30 dB. The test results of 5G millimeter wave phased array antenna for broadband communication show that the data transmission rate is more than 2.8Gbps when the bandwidth is 800MHz and the modulation mode is 64QAM. At the same time, high integration millimeter wave communication active phased array antenna can also be used in satellite communication, tactical mobile hot spots and other fields.

Nontracking antenna performance for inertially controlled spacecraft using TDRSS

Abstract: A series of tests to validate an antenna pointing concept for spin-stabilized satellites using a data relay satellite is described. These tests show that proper antenna pointing on an inertially stabilized spacecraft can lead to significant access time through the relay satellite even without active antenna pointing. We summarize the test results, the simulations to model the effects of antenna pattern and space loss, and the expected contact times. We also show how antenna beam width affects the results.