Hybrid Beamformer Antenna Array With Inter-Stage RF Amplification
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Solution Overview
Problem
Existing antenna arrays face challenges in achieving low cost and compact design while maintaining high performance, particularly in applications requiring minimal space and efficient beam steering.
Innovation Solution
The integration of RFICs with distributed beamforming circuitry, including intermediate amplifiers, forms a hybrid beamformer that combines on-chip and off-chip components, reducing the number of RFICs needed and optimizing amplifier placement for reduced manufacturing cost and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire beamforming network is integrated on each RFIC, then beamforming performance is improved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The beamforming network is segmented into multiple stages: the first stage is integrated on each RFIC chip, while the second stage is implemented on a separate hybrid circuit board. This segmentation distributes the complexity across multiple components rather than concentrating it all in one RFIC, thereby reducing individual chip complexity while maintaining overall system performance.
Solution Approach 2:
The architecture transitions from a two-dimensional integration approach (all components on one chip) to a three-dimensional distributed architecture across multiple layers and substrates (RFIC chip layer, hybrid circuit board layer, antenna array layer). This dimensional expansion allows complex beamforming functionality to be achieved without overloading any single component.
2Reliability
If more RFICs are used to maintain system performance, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the beamforming network across multiple stages and substrates, the system can achieve the required reliability through distributed functionality rather than through redundant RFICs. The hybrid circuit board provides a cost-effective platform for implementing the second stage, reducing the need for expensive additional RFICs while maintaining system reliability.
3Volume of moving object
If the antenna array and beamforming circuitry are integrated in a compact structure, then space efficiency is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The system uses a three-layer stacked architecture (antenna array layer, hybrid circuit board layer, RFIC chip layer) that efficiently utilizes vertical space. This vertical integration achieves compact volume while the hybrid circuit board provides an intermediate thermal management layer that facilitates heat dissipation from the RFICs without requiring excessive horizontal spacing.
Data Source
AI summary
An antenna apparatus includes a first component layer having a plurality of antenna elements forming an antenna array. A second component layer includes: (i) a plurality of RFICs coupled to the antenna elements, where each RFIC has active beamforming circuitry to adjust signals communicated with one or more of the antenna elements, and a portion of a first stage of a beamforming network (BFN); and (ii) an additional stage and a further stage of the BFN, each disposed externally of the RFICs. At least some of the RFICs include an intermediate amplifier coupled between the additional and further stages of the BFN.