volume | PIER Journals

2017-06-07

Eliminate Crosstalk Using Symmetry in MIMO Arrays of Inductive Antennas: an Introduction to Pie-Chart Antennas

Jean-Philippe Douarville-Blaise,

Dr. Jean-Philippe Douarville-Blaise

School of Electrical and Electronics Engineering

Mie University

Japan

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David Pouhè,

Professor David Pouhè

School of Engineering

Reutlingen University of Applied Sciences

Germany

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Junji Hirai

Dr. Junji Hirai

School of Electrical and Electronics Engineering

Mie University

Japan

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Progress In Electromagnetics Research B, Vol. 75, 149-173, 2017

doi:10.2528/PIERB17021204 | Google Scholar

Abstract

We present a topology of MIMO arrays of inductive antennas exhibiting inherent high crosstalk cancellation capabilities. A single layer PCB is etched into a 3-channels array of emitting/receiving antennas. Once coupled with another similar 3-channels emitter/receiver, we measured an Adjacent Channel Rejection Ratio (ACRR) as high as 70 dB from 150 Hz to 150 kHz. Another primitive device made out of copper wires wound around PVC tubes to form a 2-channels ``non-contact slip-ring'' exhibited 22 dB to 47 dB of ACRR up to 15 MHz. In this paper we introduce the underlying theoretical model behind the crosstalk suppression capabilities of those so-called ``Pie-Chart antennas'': an extension of the mutual inductance compensation method to higher number of channels using symmetries. We detail the simple iterative building process of those antennas, illustrate it with numerical analysis and evaluate there effectiveness via real experiments on the 3-channels PCB array and the 2-channels rotary array up to the limit of our test setup. The Pie-Chart design is primarily intended as an alternative solution to costly electronic filters or cumbersome EM shields in wireless AND wired applications, but not exclusively.

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Jean-Philippe Douarville-Blaise, David Pouhè, and Junji Hirai, "Eliminate Crosstalk Using Symmetry in MIMO Arrays of Inductive Antennas: an Introduction to Pie-Chart Antennas," Progress In Electromagnetics Research B, Vol. 75, 149-173, 2017.
doi:10.2528/PIERB17021204

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