How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System

Soheyl Soodmand; Kevin A Morris; Mark A Beach

How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System

Soheyl Soodmand, Kevin A Morris, Mark A Beach

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

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Abstract

In In-Band Full Duplex (IBFD) transceivers, Electrical Balance Duplexers (EBDs) provide Transmit (TX)-Receive (RX) isolation to implement a form of self-interference (SI) cancellation to facilitates simultaneous transmission and reception from a single antenna. EBD works by coupling transmitter, receiver, antenna, and balancing impedance using a hybrid coupler. The balancing impedance in the EBD needs to be equal as much as possible to the antenna impedance to achieve a high isolation while the antenna impedance variations limit the isolation bandwidth. Hybrid couplers are also not ideal elements, and their S parameters are variable in frequency domain. An antenna with a stable impedance, designed by authors, has been connected in this work to two different hybrid couplers in the EBD stages. One coupler is a commercial coupler and the other one, designed by the authors, has more S parameter stability in the frequency domain than the commercial one. It is shown that by using the designed coupler in the front-end EBD stage more stable isolation bandwidth and 45% better isolation value at ultra-wideband range of 1.5- 3.5GHz are obtained, in comparison when using the commercial one.

Original language	English
Title of host publication	2021 IEEE International IOT, Electronics and Mechatronics Conference (IEMTRONICS)
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Number of pages	6
ISBN (Electronic)	978-1-6654-4067-7
ISBN (Print)	978-1-6654-1160-8
Publication status	Published - 14 May 2021
Event	International IOT, Electronics and Mechatronics Conference: IEMTRONICS 2021 - Toronto, Canada Duration: 21 Apr 2021 → 24 Apr 2021

Conference

Conference	International IOT, Electronics and Mechatronics Conference
Abbreviated title	IEMTRONICS 2021
Country/Territory	Canada
City	Toronto
Period	21/04/21 → 24/04/21

Keywords

Interference cancellation
Frequency-domain analysis
Transmitting antennas
Receiving antennas
Couplers
Bandwidth
Stability analysis

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https://ieeexplore.ieee.org/document/9422504

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Persistent link

SENSE: Scalable Full Duplex Dense Wireless Networks
Beach, M. A. (Principal Investigator)
1/11/16 → 31/03/21
Project: Research

Cite this

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title = "How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System",

abstract = "In In-Band Full Duplex (IBFD) transceivers, Electrical Balance Duplexers (EBDs) provide Transmit (TX)-Receive (RX) isolation to implement a form of self-interference (SI) cancellation to facilitates simultaneous transmission and reception from a single antenna. EBD works by coupling transmitter, receiver, antenna, and balancing impedance using a hybrid coupler. The balancing impedance in the EBD needs to be equal as much as possible to the antenna impedance to achieve a high isolation while the antenna impedance variations limit the isolation bandwidth. Hybrid couplers are also not ideal elements, and their S parameters are variable in frequency domain. An antenna with a stable impedance, designed by authors, has been connected in this work to two different hybrid couplers in the EBD stages. One coupler is a commercial coupler and the other one, designed by the authors, has more S parameter stability in the frequency domain than the commercial one. It is shown that by using the designed coupler in the front-end EBD stage more stable isolation bandwidth and 45% better isolation value at ultra-wideband range of 1.5- 3.5GHz are obtained, in comparison when using the commercial one.",

keywords = "Interference cancellation, Frequency-domain analysis, Transmitting antennas, Receiving antennas, Couplers, Bandwidth, Stability analysis",

author = "Soheyl Soodmand and Morris, {Kevin A} and Beach, {Mark A}",

year = "2021",

month = may,

day = "14",

language = "English",

isbn = "978-1-6654-1160-8",

booktitle = "2021 IEEE International IOT, Electronics and Mechatronics Conference (IEMTRONICS)",

publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

address = "United States",

note = "International IOT, Electronics and Mechatronics Conference : IEMTRONICS 2021, IEMTRONICS 2021 ; Conference date: 21-04-2021 Through 24-04-2021",

}

Soodmand, S, Morris, KA & Beach, MA 2021, How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System. in 2021 IEEE International IOT, Electronics and Mechatronics Conference (IEMTRONICS). Institute of Electrical and Electronics Engineers (IEEE), International IOT, Electronics and Mechatronics Conference, Toronto, Canada, 21/04/21. <https://ieeexplore.ieee.org/document/9422504>

How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System. / Soodmand, Soheyl; Morris, Kevin A; Beach, Mark A.
2021 IEEE International IOT, Electronics and Mechatronics Conference (IEMTRONICS). Institute of Electrical and Electronics Engineers (IEEE), 2021.

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System

AU - Soodmand, Soheyl

AU - Morris, Kevin A

AU - Beach, Mark A

PY - 2021/5/14

Y1 - 2021/5/14

N2 - In In-Band Full Duplex (IBFD) transceivers, Electrical Balance Duplexers (EBDs) provide Transmit (TX)-Receive (RX) isolation to implement a form of self-interference (SI) cancellation to facilitates simultaneous transmission and reception from a single antenna. EBD works by coupling transmitter, receiver, antenna, and balancing impedance using a hybrid coupler. The balancing impedance in the EBD needs to be equal as much as possible to the antenna impedance to achieve a high isolation while the antenna impedance variations limit the isolation bandwidth. Hybrid couplers are also not ideal elements, and their S parameters are variable in frequency domain. An antenna with a stable impedance, designed by authors, has been connected in this work to two different hybrid couplers in the EBD stages. One coupler is a commercial coupler and the other one, designed by the authors, has more S parameter stability in the frequency domain than the commercial one. It is shown that by using the designed coupler in the front-end EBD stage more stable isolation bandwidth and 45% better isolation value at ultra-wideband range of 1.5- 3.5GHz are obtained, in comparison when using the commercial one.

AB - In In-Band Full Duplex (IBFD) transceivers, Electrical Balance Duplexers (EBDs) provide Transmit (TX)-Receive (RX) isolation to implement a form of self-interference (SI) cancellation to facilitates simultaneous transmission and reception from a single antenna. EBD works by coupling transmitter, receiver, antenna, and balancing impedance using a hybrid coupler. The balancing impedance in the EBD needs to be equal as much as possible to the antenna impedance to achieve a high isolation while the antenna impedance variations limit the isolation bandwidth. Hybrid couplers are also not ideal elements, and their S parameters are variable in frequency domain. An antenna with a stable impedance, designed by authors, has been connected in this work to two different hybrid couplers in the EBD stages. One coupler is a commercial coupler and the other one, designed by the authors, has more S parameter stability in the frequency domain than the commercial one. It is shown that by using the designed coupler in the front-end EBD stage more stable isolation bandwidth and 45% better isolation value at ultra-wideband range of 1.5- 3.5GHz are obtained, in comparison when using the commercial one.

KW - Interference cancellation

KW - Frequency-domain analysis

KW - Transmitting antennas

KW - Receiving antennas

KW - Couplers

KW - Bandwidth

KW - Stability analysis

M3 - Conference Contribution (Conference Proceeding)

SN - 978-1-6654-1160-8

BT - 2021 IEEE International IOT, Electronics and Mechatronics Conference (IEMTRONICS)

PB - Institute of Electrical and Electronics Engineers (IEEE)

T2 - International IOT, Electronics and Mechatronics Conference

Y2 - 21 April 2021 through 24 April 2021

ER -

How Stability of Hybrid Coupler Characteristic Affects Front-End Isolation of In-Band Full Duplex System

Abstract

Conference

Keywords

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Projects

SENSE: Scalable Full Duplex Dense Wireless Networks

Cite this