Highly Linear and Magnetless Isolator Based on Weakly Coupled Nonreciprocal Metamaterials

A novel highly linear magnetless isolator based on weakly coupled nonreciprocal metamaterials is proposed in this article. Nonreciprocal devices, such as isolators and circulators, are widely used in modern microwave, optics. Nowadays, nonreciprocity is exclusively achieved with anisotropic magneto-...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2019-11, Vol.67 (11), p.4322-4331
Main Authors: Wang, Yunfan, Chen, Wenhua, Chen, Xiaofan
Format: Article
Language:English
Subjects:
Broadband
Coupling
Couplings
Electronic devices
Integrated circuits
Isolators
Linearity
Lorentz reciprocity
Magnetic domains
Magnetic resonance
magnetless nonreciprocal metamaterial (MNM)
Metamaterials
Microwave theory and techniques
nonreciprocal devices
Phase shifters
Reconfiguration
Transistors
Transmission lines
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A novel highly linear magnetless isolator based on weakly coupled nonreciprocal metamaterials is proposed in this article. Nonreciprocal devices, such as isolators and circulators, are widely used in modern microwave, optics. Nowadays, nonreciprocity is exclusively achieved with anisotropic magneto-optic material. Unfortunately, this material needs permanent magnetic bias and is typically bulky, which remains incompatible with technology for integrated circuit. In this article, we reveal that strong isolation can be achieved even under the weak coupling between the transmission line and magnetless nonreciprocal metamaterials (MNMs). Compared with previous magnetless nonreciprocal approaches, in this article, as the wave propagates from port 2 to port 1, the interaction between the incoming wave and nonlinear devices can be neglected due to the weak coupling, yielding low loss (|S 12 | = -1.03dB) and high linearity (P 1dB > 17dBm, OIP3= 33.5dBm). As the wave propagates from port 2 to port 1, 36.2 - dB isolation can be achieved under the loop resonance. Furthermore, the frequency reconfiguration of MNMs has been investigated for the first time, leading to broadband and multiband isolators.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2019.2936343