NDLI: Common-mode suppression for balanced bandpass filters in multilayer liquid crystal polymer technology

Content Provider	IET Digital Library
Author	Prieto, Armando Fernández Qian, Shilong Hong, Jiasheng Martel, Jesus Medina, Francisco Mesa, Francisco Naqui, Jordi Martín, Ferran
Abstract	A new multilayer differential transmission line for common-mode suppression fabricated using an organic liquid crystal polymer multilayer substrate is proposed and analysed. The structure consists of a pair of parallel strip lines printed on the top layer of the substrate that are capacitively coupled to conductor patches periodically etched in an intermediate interface. These patches are symmetrically connected to a solid ground plane by means of short-circuited high-impedance microstrip line sections and metalised via holes. The differential signal supported by the coupled strips is not significantly affected by the presence of the middle layer layout, whereas the common-mode signal propagation is strongly suppressed within a certain frequency band. When this structure is cascaded with a simple differential bandpass filter exhibiting poor common mode rejection, a good common mode response is achieved within the unperturbed differential passband. The measurements confirm a significant enhancement of common-mode rejection thanks to the use of the proposed differential lines.
Starting Page	1249
Ending Page	1253
Page Count	5
ISSN	17518725
Volume Number	9
e-ISSN	17518733
Issue Number	Issue 12, Sep (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/9/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2014.0258
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2015-05-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Balanced Bandpass Filter Band-pass Filter Common Mode Rejection Common-mode Rejection Common-mode Signal Propagation Common-mode Suppression Conductor Patches Coupled Strips Coupled Transmission Line Differential Bandpass Filter Differential Signal Filter And Other Network Filtering Method in Signal Processing Intermediate Interface Liquid Crystal Polymers Metalised Via Holes Microstrip Line Middle Layer Layout Multilayer Differential Transmission Line Multilayer Liquid Crystal Polymer Technology Organic Liquid Crystal Polymer Multilayer Substrate Parallel Strip Line Short-circuited High-impedance Microstrip Line Sections Solid Ground Plane Unperturbed Differential Passband Waveguide And Microwave Transmission Line
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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