An Ingenious Multiport Interferometric Front-End for Concurrent Dual-Band Transmission

This article proposes and presents an innovative approach to realizing the concurrent dual-band transmission with only a single front-end and local oscillator at radio frequency (RF). Fundamentally, the proposed concurrent dual-band front-end is based on the conventional multiport interferometric ar...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2022-03, Vol.70 (3), p.1725-1731
Main Authors: Cheong, Pedro, Tu, Mengting, Choi, Wai-Wa, Wu, Ke
Format: Article
Language:English
Subjects:
Channels
Concurrent operation
Constellation diagram
Data transmission
Dual band
dual-band transmission
front-end
interchannel interference
Interferometry
linear transformation
multiport network
Quadrature amplitude modulation
Radio frequency
RF signals
Schottky diodes
Transmitters
Wireless communication
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Summary:This article proposes and presents an innovative approach to realizing the concurrent dual-band transmission with only a single front-end and local oscillator at radio frequency (RF). Fundamentally, the proposed concurrent dual-band front-end is based on the conventional multiport interferometric architecture for single-band operation. Nevertheless, the conventional variable loads are replaced by diode networks with IF input signals to produce the RF signals at their designated center frequencies. Furthermore, due to the linear characteristics of a multiport network, the signals with different data contents will be mixed into both RF channels. To this end, an inverse matrix operation is applied to reversely convert the original data streams before the modulations of IF input signals. As a result, the two original data streams can be effectively modulated into specific RF channels (for transmission) with minimal interchannel interferences based on this configuration. In addition to the theoretical analyses, this innovative concurrent dual-band transmitting front-end has been investigated and verified with M -quadrature amplitude modulation (QAM) signals in simulations and experiments. All outcomes demonstrate excellent performances in concurrent dual-band transmission with significant reductions in both size and biasing power.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2021.3134692