volume | PIER Journals

2022-09-01

Miniaturized Lumped-Element LTCC Quadrature Hybrid with LC Stacked Structure

Jixi Lu,

Dr. Jixi Lu

School of Electronic and Optical Engineering

Nanjing University of Posts and Telecommunications

China

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Jiyi Bian,

Dr. Jiyi Bian

School of Electronic and Optical Engineering

Nanjing University of Posts and Telecommunications

China

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Bo Zhou

Professor Bo Zhou

School of Electronic and Optical Engineering

Nanjing University of Posts and Telecommunications

China

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Progress In Electromagnetics Research Letters, Vol. 106, 75-80, 2022

doi:10.2528/PIERL22070403

Abstract

A miniaturized lumped-element quadrature hybrid with a high density stacked structure is proposed in a 24-layer low temperature co-fired ceramic (LTCC) substrate. Stacking vertical-interdigital-capacitors (VICs) and vertically-spiral-inductors are for an entire size reduction. The transition between inductors realized in the inner space of the inductor further improves the utilization of three-dimensional space. The overall size of the quadrature hybrid is only 10.1×3.8×2.4 mm, or equivalently 0.0040×0.0015×0.0009λ_g³, which achieves a size reduction of 30.2%. Meanwhile, the proposed hybrid operates at 60 MHz with a fractional bandwidth (FBW) of 33.3%. The measured S₁₁, S₂₁, S₃₁ and S₄₁ are -14.5, -3.8, -3.7, and -14.2 dB within the operating frequency band, respectively, and both of the low phase imbalance and amplitude imbalance are achieved.

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Jixi Lu, Jiyi Bian, and Bo Zhou, "Miniaturized Lumped-Element LTCC Quadrature Hybrid with LC Stacked Structure," Progress In Electromagnetics Research Letters, Vol. 106, 75-80, 2022.
doi:10.2528/PIERL22070403

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