Compact LTCC Branch-line Coupler with Harmonics Suppression

Gu, Ling; Tie, Huanyan; Song, Zichen; Ma, Qiang; Hu, Shanwen; Zhou, Bo

doi:10.1109/icmmt52847.2021.9618027

Cited by 10 publications

(5 citation statements)

References 7 publications

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“…As observed, the proposed quadrature hybrid has the smallest reported size, highest return loss, highest isolation, lowest amplitude imbalance, and lowest phase difference among the literatures. 2,3,[14][15][16] The proposed hybrid has a fractional bandwidth (FBW) of 20%, which is narrower than that of Reference 3. That's because the complicated layout of IIEI leads to its inductance increasing sharper than that of Reference 3 when the frequency increases.…”

Section: Results and Comparisonsmentioning

confidence: 89%

“…Hence, the miniaturization of the quadrature hybrid working at the IF band can be only realized by using lumped-element components. [1][2][3] And constructing a hybrid working at such a low frequency requires both high inductance and high capacitance. Nevertheless, in Reference 1, the maximal required inductance and capacitance of the hybrid are no more than 20 nH and 10 pF, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized lumped quadrature hybrid using inductance‐ and integration‐enhanced inductors for VHF band applications

Song

Zhou

2022

Int J RF Mic Comp-Aid Eng

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A miniaturized lumped-element quadrature hybrid is proposed for the very high frequency (VHF) band applications. The overall size reduction of the hybrid is achieved by the proposed three-dimensional (3D) inductance-and integration-enhanced inductors (IIEIs), which etch planar internal turns inside the conventional spiral inductor for inductance increment and size reduction. The hybrid is implemented on a 10-layer low-temperature co-fired ceramic (LTCC) substrate with a size of only 0.0048 Â 0.0027 Â 0.0004 λ g 3 . Measured S 11 , S 21 , S 31 and S 41 are better than À18, À5, À3.6, and À13 dB from 45 to 55 MHz, respectively. And the measured amplitude imbalance and phase difference between the through and coupled port are within 1.4 dB and 90 ± 1 , respectively. The proposed hybrid has wide applications in super heterodyne intermediate frequency (IF) circuit, Tesla magnetic resonance imaging (MRI) equipment and maritime communications.

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Section: Results and Comparisonsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Miniaturized lumped quadrature hybrid using inductance‐ and integration‐enhanced inductors for VHF band applications

Song

Zhou

2022

Int J RF Mic Comp-Aid Eng

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“…Comparing with the equivalent implementation provided in Zhou et al, 2 the proposed balun reduces in size by 22%. It has been noted that among the literatures, 2,3,[11][12][13] the proposed LTCC balun has the smallest reported size, lowest amplitude imbalance, highest return loss, minimum phase difference, and widest FBW based on 15 dB return loss.…”

Section: Results and Comparisonsmentioning

confidence: 96%

“…Recently, circuit miniaturization is popular using low-temperature co-fired ceramic (LTCC)-based system-in-package technologies. [2][3][4][5][6][7] With the wide applications of traditional vertically interdigital capacitors (VICs), passive components become smaller with high Q-factors. [8][9][10][11][12][13][14] With the progress in semiconductor technologies, a high performance transformer balun is made with very low magnitude imbalance and phase imbalance using 0.13 μm SiGe technology.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it is impractical to make smaller circuits at a few megahertz frequencies with low capacitance or inductance density elements. Recently, circuit miniaturization is popular using low‐temperature co‐fired ceramic (LTCC)‐based system‐in‐package technologies 2–7 . With the wide applications of traditional vertically interdigital capacitors (VICs), passive components become smaller with high Q‐factors 8–14 .…”

Section: Introductionmentioning

confidence: 99%

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Miniaturized lumped‐element low‐temperature co‐fired ceramic balun using capacitance‐enhanced capacitors

Zhou

Zheng

2023

Circuit Theory & Apps

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SummaryA capacitance‐enhanced capacitor (CEC) is proposed and applied to build a low‐temperature co‐fired ceramic (LTCC) balun for miniaturization. The capacitance enhancement is by adding horizontal fingers to traditional vertically interdigital capacitor (VIC) for capacitance increasing without size enlargement. The proposed CEC increased 7.2% capacitance comparing with that of traditional VIC. The balun using the proposed CEC is only 9.5 × 8.4 × 1 mm3, which is equivalent to 0.0034 × 0.0031 × 0.0004 λg3. The measured inband S11, S21, and S31 are better than −15, −3.6, and 3.5 dB from 46 to 58 MHz, respectively. A wide fractional bandwidth (FBW) of 24% based on 15 dB return loss is also reached. The proposed balun has widely applications in maritime navigation, aircraft navigation, and 1–1.5 Tesla (T) magnetic resonance imaging (MRI) applications.

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