Ultrawideband Parallel Plate Lens Multi-Beamformer
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Solution Overview
Problem
Conventional beamformers face challenges in achieving low signal distortion, low insertion loss, and good power handling, especially at high instantaneous bandwidths, and struggle with wideband efficiency and scan performance, making them unsuitable for massive MIMO systems and broadband operations at sub-6GHz frequencies.
Innovation Solution
A wideband parallel plate lens multi-beamformer is developed, featuring capacitive probe feeds and a sealed cavity design that overcomes the limitations of conventional microstrip and waveguide lenses, providing a low-cost, fully passive true-time delay network with high efficiency and squint-free patterns, enabling enhanced data throughput and beam-steering capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional microstrip or waveguide lenses are used, then the device structure is simple and easy to manufacture, but the bandwidth is narrow and resonances occur at wideband frequencies
Solution Approach 1:
The patent changes the fundamental operating parameters by transitioning from microstrip/waveguide modes to parallel plate waveguide mode, enabling wideband operation. The parallel plate structure with spacing less than lambda/4 at the highest operating frequency eliminates resonances and supports ultrawide bandwidth while maintaining manufacturing simplicity through standard PCB or laminated plate construction
Solution Approach 2:
The patent employs composite construction by laminating multiple dielectric plates together to form the parallel plate waveguide structure. This composite approach allows precise control of electrical properties while maintaining mechanical stability and ease of manufacture, achieving both narrow bandwidth limitations and wideband performance
2Ease of manufacture
If horn feed ports are used in constrained lenses, then the structure is straightforward, but radiation losses increase and wide-angle scan performance deteriorates
Solution Approach 1:
The patent extracts and eliminates the horn feed port structure from the lens system. Instead of using conventional horn feeds that cause radiation losses and limited scan performance, the invention uses probe feeds that couple energy into the parallel plate waveguide mode, significantly reducing radiation losses and enabling wide-angle scanning without performance degradation
3Extent of automation
If active RF beamformers based on CMOS or SiGe chips are used, then integration is improved, but cost and complexity increase significantly for massive MIMO systems
Solution Approach 1:
The patent replaces active electronic beamforming components (CMOS/SiGe chips, phase shifters, TTD units) with a passive optical-style lens system. The parallel plate lens performs beamforming through its geometric structure and wave propagation characteristics, eliminating the need for complex active components while maintaining integration benefits
Solution Approach 2:
The patent adapts the optical lens concept to the RF domain by creating a parallel plate waveguide lens that copies the functionality of optical lenses. This passive lens structure performs delay-and-sum beamforming operations through its physical geometry rather than active electronic control, dramatically reducing complexity for massive MIMO applications
4Ease of operation
If digital TTD units are used in RF beamforming, then beam steering capability is achieved, but quantization lobes increase and signal distortion occurs
Solution Approach 1:
The patent replaces digital TTD units with a continuous physical delay structure. The parallel plate lens provides true time delay through its geometric path length variations, offering continuous rather than quantized delay control. This eliminates quantization lobes and reduces signal distortion while maintaining full beam steering capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves improved efficiency and scan performance across wide bandwidths, supporting massive MIMO and broadband operations with reduced size and power consumption, while maintaining low signal distortion and insertion loss, suitable for applications in 5G wireless networks and satellite communications.
Implementation Method 1
capacitive probe feeds disposed in the sealed cavity
Implementation Method 2
parallel plate wave conducting lens with a sealed cavity
Implementation Method 3
parallel plate wave conducting lens with a sealed cavity
Implementation Method 4
electrically sealed cavity
Data Source
AI summary
A parallel plate lens including a top plate, a bottom plate, a side-wall coupled to the top plate and the bottom plate to form the parallel plate lens with a cavity, and a plurality of capacitive probe feeds disposed in the cavity at a spacing interval associated with a guided wavelength (λ) within the cavity.