Tapering Impact on the Spatial and Frequency Responses of Broadband Asymmetrically Routed Phased Arrays
Delfini, Duccio; Tervo, Nuutti; Javed, Muhammad Y.; Leinonen, Marko E.; Pärssinen, Aarno (2024-04-26)
IEEE
26.04.2024
D. Delfini, N. Tervo, M. Y. Javed, M. E. Leinonen and A. Pärssinen, "Tapering Impact on the Spatial and Frequency Responses of Broadband Asymmetrically Routed Phased Arrays," 2024 18th European Conference on Antennas and Propagation (EuCAP), Glasgow, United Kingdom, 2024, pp. 1-5, doi: 10.23919/EuCAP60739.2024.10501642.
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© 2024 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202405314127
https://urn.fi/URN:NBN:fi:oulu-202405314127
Tiivistelmä
Abstract
Asymmetrical feeding networks can be used to amplify the beam squint phenomena of the phased arrays and to make their frequency domain behavior very angle-dependent. The aim of this paper is to demonstrate the analogy between the far field of a side-fed uniform linear array (ULA) and its frequency response in the beam steering direction. Indeed, by using simplified array equations, we show that the beam pattern of an asymmetrical series-fed ULA is similar to the frequency response observed at the steering angle. Furthermore, we show that amplitude tapering which is used to reduce the sidelobe level (SLL) of the array also reduces the corresponding sidebands of the frequency response in the given steering angle, to facilitate frequency domain filtering. Moreover, a modified tapering method is introduced to showcase the generality of the analysis.
Asymmetrical feeding networks can be used to amplify the beam squint phenomena of the phased arrays and to make their frequency domain behavior very angle-dependent. The aim of this paper is to demonstrate the analogy between the far field of a side-fed uniform linear array (ULA) and its frequency response in the beam steering direction. Indeed, by using simplified array equations, we show that the beam pattern of an asymmetrical series-fed ULA is similar to the frequency response observed at the steering angle. Furthermore, we show that amplitude tapering which is used to reduce the sidelobe level (SLL) of the array also reduces the corresponding sidebands of the frequency response in the given steering angle, to facilitate frequency domain filtering. Moreover, a modified tapering method is introduced to showcase the generality of the analysis.
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