Design of Compact 90$^{\circ}$ and 180$^{\circ}$ Couplers With Harmonic Suppression Using Lumped-Element Bandstop Resonators

Hou, Jian-An; Wang, Yeong-Her

doi:10.1109/tmtt.2010.2078950

Cited by 32 publications

(33 citation statements)

References 13 publications

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“…3, in contrast to [19], the AI and PD of the proposed couplers are improved. Besides, the below −20 dB return loss and isolation of the proposed couplers remain similar with [19]. However, at the upper side operation band, the performance degrades if the rejected harmonic frequency is close to the operational frequency.…”

Section: Architecture Analysismentioning

confidence: 91%

“…As shown in Fig. 3, in contrast to [19], the AI and PD of the proposed couplers are improved. Besides, the below −20 dB return loss and isolation of the proposed couplers remain similar with [19].…”

Section: Architecture Analysismentioning

confidence: 91%

“…The adoption of band-stop resonator (composed by L r and C r ) at the center of the topology is for harmonic suppression. Unlike [19], in this topology the number of band-stop resonator is reduced to one to improve working bandwidth. Besides, the number of devices employed in this topology is decreased for size and cost reduction.…”

Section: Architecture Analysismentioning

confidence: 99%

“…However, their interests are mainly concentrated on the size reduction. Recently, a lumped-element coupler using band-stop resonators to realize harmonic suppression has been reported [19], where three band-stop resonators are used. However, due to introducing of three band-stop resonators, the bandwidth is narrowed.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with [19], the only adoption of center band-stop resonator improves bandwidth behavior while maintaining good harmonic rejection. The about 25% bandwidth supports different bands such as 2.3 GHz (IEEE 802.16e), 2.4 GHz (IEEE 802.11b/g/n), and 2.5-2.7 GHz (IEEE 802.16e).…”

Section: Introductionmentioning

confidence: 99%

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Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

Li²,

Gu³

et al. 2013

PIER C

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Abstract-A compact quadrature hybrid coupler with harmonic suppression using lumped-element band-stop resonator is proposed for bandwidth improvement. Conventionally, harmonic rejection is realized by three band-stop resonators in lumped hybrids. The using of three band-stop resonators realizes better harmonic suppression while exhibiting narrower frequency response. So as to improve operation bandwidth behavior, the number of band-stop resonator applied in the proposed topology is minimized to one. Trading off with acceptable reduction in harmonic rejection, the proposed hybrid enlarges working bandwidth with fewer numbers of lumped devices. Detailed design and theoretical analysis are presented and the expressions of lumped elements with dependence of rejected frequency are obtained. To validate the analysis, three 2.45 GHz couplers are fabricated on an FR-4 printed circuit board. The experimental results exhibit 27.3%, 26.9% and 23.3% operation bandwidth with better than 16 dB, 17 dB, and 21 dB harmonic suppressions at 4.9 GHz, 6.1 GHz, and 7.35 GHz, respectively. Less than 0.8 dB amplitude imbalance and 2 • phase error are achieved for all the three couplers, which are matched well with theoretical analysis.

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Section: Architecture Analysismentioning

confidence: 91%

Section: Architecture Analysismentioning

confidence: 91%

Section: Architecture Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

Li²,

Gu³

et al. 2013

PIER C

View full text Add to dashboard Cite

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Arbitrary power division quadrature branch‐line coupler with harmonic suppression

Gai

Jiao

Zhao

2017

Micro & Optical Tech Letters

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A planar branch‐line coupler with arbitrary power division and harmonic suppression is proposed. A novel offsetting double‐side parallel‐strip T‐section is used for designing the coupler. To verify the design procedure, a prototype operating at 1.76 GHz with 10 dB power division ratio and a stopband up to nearly four times of the center frequency is simulated, fabricated and tested. The measured results agree well with the simulated ones.

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Miniaturized VHF‐band LTCC balun using L‐C surrounded resonator

Wang

et al. 2022

Micro & Optical Tech Letters

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A miniaturized lumped-element balun is proposed for the very high frequency band applications. The miniaturization is accomplished by the inductor-capacitor (L-C) surrounded resonator, which places a vertically interdigital-capacitor inside spiral inductor for higher integration. The L-C surrounded resonator only takes up one element's area without increasing the number of substrate layers. The balun is built on a 10-layer thickness low temperature co-fired ceramic substrate and has the smallest reported size of only 0.004 × 0.003 × 0.0003λ g . Moreover, the proposed balun also has a second-order harmonic suppression of 40 dB. Furthermore, thermal boundary analysis, comparisons, and discussions are also implemented.

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Design of Compact 90$^{\circ}$ and 180$^{\circ}$ Couplers With Harmonic Suppression Using Lumped-Element Bandstop Resonators

Cited by 32 publications

References 13 publications

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

Arbitrary power division quadrature branch‐line coupler with harmonic suppression

Miniaturized VHF‐band LTCC balun using L‐C surrounded resonator

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