The beamformer relies on simple tunable optical delay lines and also on self-heterodyne coherent detection. Each tunable delay line is implemented by a Mach-Zehnder delay interferometer with tunable coupling ratio, which allows varying the delay from 0 up to the delay of the interferometer. Self-...
To resolve these issues, we introduce the first true-time-delay digital beamforming IC, which eliminates beam squinting error by adopting a baseband true-time-delay technique. Furthermore, we present a constant output impedance current-steering digital-to-analog converter (DAC), which improves the...
This article reviews the strengths and weaknesses of two electronic beamforming techniques: phase shifters (PSs) and true time delays (TTDs). It argues that these two methods can be combined in a hybr
This new adaptive system provides the full NM degrees of freedom of a conventional N element time delay beamformer with M taps, each, enabling it to fully and optimally adapt to an arbitrary complex spatio-temporal signal environment that can contain broadband signals, noise, and narrowband and ...
2.The apparatus of claim 1 wherein each true path length represents a path that results in a time delay that produces a phase shift and a phase slope. 3.The apparatus of claim 1 wherein the number of different true path lengths corresponds to the number of possible beam positions generated...
Each channel mainly consists of a GaAs beamformer MMIC, a GaAs low noise amplifier (LNA), a GaAs limiter, a GaN power amplifier (PA), a circulator, a pulse modulation circuit and a power supply circuit. Amplifiers, phase shifters, attenuators and serial-to-parallel converters are integrated...
The computational complexity of beam space beamformers is reduced through reducing the number of degrees of freedom compared with the traditional element space beamformers. 同传统的阵元空间波束合成器相比,波束空间波束合成器通过减少自由度来实现运算量的减少。 4. 52kb Metbods: a two dimensional fin...
Mixed signal true time delay digital beamformer 专利名称：Mixed signal true time delay digital beamformer 发明人：Larry K. Lam 申请号：US09313758 申请日：19990518 公开号：US06701141B2 公开日：20040302 专利内容由知识产权出版社提供 专利附图：摘要：An apparatus for implementing true time delay digital...
The proposed beamformer can provide maximum continuously tunable true time delay of 125 ps for delay bandwidth of 32.46 GHz. Therefore, the beam scanning range of 0–90° can be attained by properly tuning the coupling coefficient and resonance frequency of the racetrack resonator based delay ...
An apparatus for implementing true time delay digital beamformers for forming transmit and/or receive beams in array antennas. The apparatus includes a mixed signal application-specific integrated circuit (ASIC), which is comprised of an analog-to-digital converter (A/D) as an input circuit, an...