Abstract
This paper proposes a bidirectional absorptive common-mode filter (A-CMF) for 5G “green” communication systems. The A-CMF is a balanced-to-balanced structure using interdigitated coupled lines to replace normal double parallel-coupled lines for enhanced coupling and easy manufacturing. The resistors are introduced to dissipate the common-mode (CM) noises into heat and thus to avoid the noises being reflected and still existing in the communication system. This novel A-CMF features an intrinsic CM noises absorption while maintaining its differential-mode (DM) filtering characteristics. As a proof-of-concept demonstration, one microstrip prototype is fabricated in a two-layer printed circuit board (PCB) and the measurements are consistent with the simulations. The DM signals can pass through this A-CMF without being attenuated from 1.38 GHz to 5.19 GHz but the CM noises are suppressed throughout the broad frequency range between 0.72 GHz and 8 GHz. It is worth noting that this A-CMF realizes a wide band with 90% absorption efficiency of CM noises from 2.18 GHz to 4.97 GHz.
Highlights
Compared to the current 4G network, 5G communication systems need to support higher data rates, much broader bandwidths, and massive connectivity
There will be a strong requirement for massive connectivity in the future internet of things (IoT) and massive multiple input multiple output (MIMO) scenarios, where
Noise suppression and noise absorption techniques over wide frequency ranges have attracted an increasing attention since the common-mode (CM) noises are a kind of RF energy commonly existing in communication systems
Summary
Compared to the current 4G network, 5G communication systems need to support higher data rates, much broader bandwidths, and massive connectivity. Y. Guan et al.: Bidirectional A-CMF Based on Interdigitated Microstrip Coupled Lines for 5G ‘‘Green’’ Communications the ‘‘hotspots’’ energy into high dc voltage and power [3]. Noise suppression and noise absorption techniques over wide frequency ranges have attracted an increasing attention since the common-mode (CM) noises are a kind of RF energy commonly existing in communication systems. A broadband CM noise absorption circuit has been put forward using resistors for high-speed differential digital systems [18]. In order to implement energy-efficient communication systems, the absorptive common-mode filter (A-CMF) has been invented in recent years to eliminate the reflected CM noises. A planar wideband bandpass filter realizes the function of CM absorption together with the performance of bandpass filtering for the first time [22] This A-CMF has a consistent bandwidth for both differential-mode (DM) filtering and CM absorption. It is worth mentioning that this A-CMF realizes a wide absorption band with 90% absorption efficiency of CM noises from 2.18 GHz to 4.97 GHz
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