Zobrazeno 1 - 10
of 23
pro vyhledávání: '"Sangwook Na"'
Publikováno v:
IEEE Access, Vol 11, Pp 104244-104252 (2023)
This paper presents a high-resolution, low-bandwidth, continuous-time delta-sigma modulator (CTDSM). Although continuous-time integrators are popular for implementing power-efficient DSMs, the coefficient of conventional RC integrators depends on the
Externí odkaz:
https://doaj.org/article/2c8d829c5603406bb2ff87a98ebd14cd
Autor:
Seongjung Kim, Sangwook Nam
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 24, Iss 5, Pp 504-509 (2024)
In this study, we propose a method for designing a feeding network for all port-matched and high gain dipole subarray antennas excited by uniform current mode (UCM) by considering the mutual coupling effect. By analyzing the array impedance matrix, w
Externí odkaz:
https://doaj.org/article/e3c95292da7240cfb3e060dadecb8107
Autor:
Seongjung Kim, Sangwook Nam
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 24, Iss 5, Pp 541-543 (2024)
This letter introduces a novel wideband, low profile, tightly coupled dipole subarray for wireless communication systems. The proposed subarray, composed of 3 × 3 unit elements, offers a planar structure with high aperture efficiency. The unit eleme
Externí odkaz:
https://doaj.org/article/450195ea82524f15adbe2c667ef19f67
Autor:
Kyu-Jin Choi, Reem Song, Chan-Jong Lee, Jeong-Bae Yoon, Dong-Yeol Yang, Seuk-Won Kang, Sangwook Nam, Byung-Sung Kim
Publikováno v:
IEEE Access, Vol 12, Pp 94632-94642 (2024)
This paper presents a Ka-band beam steering transmitter exploiting a coupled varactor loaded transmission line (VLTL) phase shifter and a CMOS transmitter chip with an integrated frequency multiplier. The short-coupled line couplers placed along a si
Externí odkaz:
https://doaj.org/article/fe0cdb7cfa124cbb87a8de0e9904c9e6
Autor:
Ho Yeol Kim, Sangwook Nam
Publikováno v:
IEEE Access, Vol 12, Pp 53677-53685 (2024)
This study investigates a hybrid beamfocusing method for microwave wireless power transmission (MPT). We propose an optimization algorithm to obtain an optimal coefficient of phase shifters and amplitude controllers with maximum RF power transfer eff
Externí odkaz:
https://doaj.org/article/cda795b1fb434d5a89432e9cab4b38f2
D-Band 4 × 4 Multi-Feed Array Antenna-in-Package for High-Power Combining and Polarization Synthesis
Publikováno v:
IEEE Access, Vol 11, Pp 144006-144016 (2023)
A $4\times4$ multi-feed array antenna-in-package (AiP) is presented for high-power combinations and various polarization syntheses, which operates at D-band. The multi-feed antenna element was designed considering $N$ -number ( $K \times K$ ) of arra
Externí odkaz:
https://doaj.org/article/a8cf44b40262418295f59f6ded6f3e71
Autor:
Jae-Hyun Park, Taewoo Yu, Eun-Bin Kim, Seung-Yeon Kim, Reem Song, Sangwook Nam, Byung-Sung Kim
Publikováno v:
IEEE Access, Vol 11, Pp 141473-141484 (2023)
This work presents a high angular resolution radar system operating at 94 GHz, utilizing a 20-channel receiver (RXs) and a single-channel transmitter (TX) in 65-nm CMOS technology. The receiver consists of five subarray chips and each chip has four r
Externí odkaz:
https://doaj.org/article/ebbbd87ab6464a559b522e8a103fec2f
Publikováno v:
IEEE Access, Vol 11, Pp 109899-109910 (2023)
In recent years, the research on FMCW radar utilizing the mmWave band has gained significant attention, especially in its application to autonomous driving systems. As a potential replacement for lidar, high-resolution studies have been pursued, nece
Externí odkaz:
https://doaj.org/article/c718cd64111444f9804f33993e6dac23
Autor:
Doohyun Yang, Sangwook Nam
Publikováno v:
IEEE Access, Vol 11, Pp 72552-72561 (2023)
In this study, a novel antenna design is proposed for designing a frequency-reconfigurable wide-angle beam scanning antenna and applied to a squarely modulated reactance surface leaky wave antenna. The antenna beam angle is electronically steered wit
Externí odkaz:
https://doaj.org/article/edf12a106b9044cbb9a0448195fc34b5
Publikováno v:
Journal of Electromagnetic Engineering and Science, Vol 23, Iss 1, Pp 69-74 (2023)
In this study, we present an efficient method to find the power transfer efficiency (PTE) bound for practical microwave and mmWave wireless power transfer (MPT) systems composed of transmitter (Tx) and receiver (Rx) array antennas. The PTE bound of t
Externí odkaz:
https://doaj.org/article/ac326f038132413fbd6b3e5b8329b700