A Ka-Band Beam-Steering Radar Transmitter Using Active Multiplier and Coupled Delay Line Phase Shifter

A Ka-Band Beam-Steering Radar Transmitter Using Active Multiplier and Coupled Delay Line Phase Shifter

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 single VLTL provides multi-phase outputs while minim...

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Bibliographic Details
Main Authors: Kyu-Jin Choi, Reem Song, Chan-Jong Lee, Jeong-Bae Yoon, Dong-Yeol Yang, Seuk-Won Kang, Sangwook Nam, Byung-Sung Kim
Format: Article
Language:English
Published: IEEE 2024-01-01
Series:IEEE Access
Subjects:
Phased-array
VLTL
beam-steering
coupler
phase shifter
transmitter
Online Access:https://ieeexplore.ieee.org/document/10570389/
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Summary: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 single VLTL provides multi-phase outputs while minimizing the impedance mismatch and unequal power distribution along the VLTLs. The inherent phase-accumulating nature along the VLTL reduces the burden of wide phase control range required for using separate phase shifters for each channel. Additionally, the frequency multiplier with a multiplication ratio of 8 reduces the required amount of phase change at the reference frequency and therefore the tuning range of the varactor, which also minimize a change of line characteristic impedance to ensure the impedance matching of the VLTL. Hence, a 32 GHz phased array transmitter is implemented using a single VLTL phase shifter operating at a low reference frequency of about 4 GHz. The fabricated <inline-formula> <tex-math notation="LaTeX">$1\times 4$ </tex-math></inline-formula> phased array transmitter achieves a continuous beam steering range of &#x00B1;20&#x00B0; in the E-plane using a single control voltage. The sidelobe level is below -10 dB at all scan angles and the peak effective isotropic radiated power (EIRP) is 38.1 dBm at 31.6 GHz and the 3-dB bandwidth of 2.4 GHz is achieved.
ISSN:2169-3536

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