Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays
Fully digital arrays offer huge advantages in terms of flexibility and performance; however, they may suffer from dynamic range issues when used in the presence of in-band interferers. Higher dynamic range components can be used, but are more costly and power hungry, making the implementation of suc...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IEEE
2019-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8861309/ |
| _version_ | 1818412550657671168 |
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| author | Robin W. Irazoqui Caleb J. Fulton |
| author_facet | Robin W. Irazoqui Caleb J. Fulton |
| author_sort | Robin W. Irazoqui |
| collection | DOAJ |
| description | Fully digital arrays offer huge advantages in terms of flexibility and performance; however, they may suffer from dynamic range issues when used in the presence of in-band interferers. Higher dynamic range components can be used, but are more costly and power hungry, making the implementation of such technology impractical. This paper presents a way to mitigate those interferers by creating a spatial notch at the RF front-end with an antenna-agnostic circuit placed at the feeding network of the antenna array. This circuit creates a steerable null in the embedded element pattern that mitigates interferers at a specified incoming angle. A full mathematical model and closed form expressions of the behavior of the circuit are obtained and compared to simulated and measured results, where up to a 20 dB null in the embedded element pattern of an 1$\times$ 8 array is achieved with less than 1.5 dB of insertion loss. Finally, a real case scenario is set up with a desired signal and an interferer, which is initially saturating the receiver. The receiver successfully demodulates the signal after the null is placed in the direction of the interferer. |
| first_indexed | 2024-12-14T10:49:06Z |
| format | Article |
| id | doaj.art-bde54771b8f24df7952a04cf176a51bb |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-14T10:49:06Z |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-bde54771b8f24df7952a04cf176a51bb2022-12-21T23:05:18ZengIEEEIEEE Access2169-35362019-01-01715126115127210.1109/ACCESS.2019.29459788861309Spatial Interference Nulling Before RF Frontend for Fully Digital Phased ArraysRobin W. Irazoqui0https://orcid.org/0000-0001-5318-4438Caleb J. Fulton1Advanced Radar Research Center, School of Electrical and Computer Engineering, The University of Oklahoma, Norman, OK, USAAdvanced Radar Research Center, School of Electrical and Computer Engineering, The University of Oklahoma, Norman, OK, USAFully digital arrays offer huge advantages in terms of flexibility and performance; however, they may suffer from dynamic range issues when used in the presence of in-band interferers. Higher dynamic range components can be used, but are more costly and power hungry, making the implementation of such technology impractical. This paper presents a way to mitigate those interferers by creating a spatial notch at the RF front-end with an antenna-agnostic circuit placed at the feeding network of the antenna array. This circuit creates a steerable null in the embedded element pattern that mitigates interferers at a specified incoming angle. A full mathematical model and closed form expressions of the behavior of the circuit are obtained and compared to simulated and measured results, where up to a 20 dB null in the embedded element pattern of an 1$\times$ 8 array is achieved with less than 1.5 dB of insertion loss. Finally, a real case scenario is set up with a desired signal and an interferer, which is initially saturating the receiver. The receiver successfully demodulates the signal after the null is placed in the direction of the interferer.https://ieeexplore.ieee.org/document/8861309/Phased arraysspatial filtersspatial interferencejammer suppression |
| spellingShingle | Robin W. Irazoqui Caleb J. Fulton Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays IEEE Access Phased arrays spatial filters spatial interference jammer suppression |
| title | Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays |
| title_full | Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays |
| title_fullStr | Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays |
| title_full_unstemmed | Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays |
| title_short | Spatial Interference Nulling Before RF Frontend for Fully Digital Phased Arrays |
| title_sort | spatial interference nulling before rf frontend for fully digital phased arrays |
| topic | Phased arrays spatial filters spatial interference jammer suppression |
| url | https://ieeexplore.ieee.org/document/8861309/ |
| work_keys_str_mv | AT robinwirazoqui spatialinterferencenullingbeforerffrontendforfullydigitalphasedarrays AT calebjfulton spatialinterferencenullingbeforerffrontendforfullydigitalphasedarrays |