Cross-Mixing Hybrid Beamformer for Wideband Apertures

Existing beamforming arrays suffer from the size and cost of the RF front-end and digital back-end components. In this paper, a novel hybrid beamforming configuration for wideband receivers is introduced. The design replaces phase shifters and local oscillators (LO) with cross mixing antenna element...

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Bibliographic Details
Published in:IEEE access 2021, Vol.9, p.59456-59465
Main Authors: Hokayem, Rimon, Govindarajulu, Sandhiya Reddy, Alwan, Elias A., Volakis, John L.
Format: Article
Language:English
Subjects:
Antenna arrays
antenna subarrays
Array signal processing
Beamforming
Broadband
Delays
front end circuits and systems
frontend circuitry
Oscillators
Phase shifters
Radio frequency
Receiving antennas
RF front ends
RF signals
self-mixing
self-mixing array
self-mixing subarray
wide beamwidth
wideband apertures
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Summary:Existing beamforming arrays suffer from the size and cost of the RF front-end and digital back-end components. In this paper, a novel hybrid beamforming configuration for wideband receivers is introduced. The design replaces phase shifters and local oscillators (LO) with cross mixing antenna elements to maximize diversity gain. In this paper, an analytical model of the cross mixing beamformer (CMB) is first presented. Simulations are carried out showing that a maximum diversity gain can be achieved with the CMB approach. Two prototypes were implemented using 2\times 1 and 4\times 2 element arrays and tested at 2.31 GHz. Measured results show that CMB achieves coherent signal combining and can preserve the phase delay information needed for hybrid beamforming setups.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2021.3073866