Asymmetric Ultra-Wideband Microstrip-to-Coplanar Stripline Transition

Lee, Gwan Hui; Mohyuddin, Wahab; Choi, Hyun Chul; Kim, Kang Wook

doi:10.1109/lmwc.2018.2822723

Cited by 18 publications

(28 citation statements)

References 7 publications

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“…The length of the proposed bended CPS-to-MSL transition is reduced to 1318 mils, and a lower cut-off frequency of 1.8 GHz is achieved, which is lowest among the reported transitions. [2][3][4][5] Furthermore, the fractional bandwidth of 160% is obtained, and the length of the transition is reduced by 33.4% by using two bended sections in the transitional structure.…”

Section: Simulation and Measurementmentioning

confidence: 97%

“…The bended CPS‐to‐MSL transition is represented from BB′ to CC′ in Figure , which is an asymmetric CPS‐to‐MSL transition structure with two bended sections. The top and bottom ground lines are connected by vias of diameter 10 mil, and the length of this part is l 2 = 868 mil.…”

Section: Design and Analysismentioning

confidence: 99%

“…These previous designs did not provide the analytical model for the transition structure. A practical design of the ultra‐wideband CPS‐to‐MSL transition was proposed by the authors' group, and, also recently, an asymmetric ultra‐wideband CPS‐to‐MSL transition based on the analytic transition model, which allowed significant impedance difference between CPS and MSL, was reported by the authors' group …”

Section: Introductionmentioning

confidence: 99%

“…A practical design of the ultrawideband CPS-to-MSL transition was proposed by the authors' group, 4 and, also recently, an asymmetric ultrawideband CPS-to-MSL transition based on the analytic transition model, which allowed significant impedance difference between CPS and MSL, was reported by the authors' group. 5 With millimeter-wave balanced antennas, however, the CPS line impedance tends to be very high (eg,~160 Ω). The proposed transition is designed for use in the antennadetector array in W/F-band (75-140 GHz) for the Electron Cyclotron Emission (ECE) imaging diagnostics for the KSTAR (Korea Superconducting Tokamak Advanced Research) tokamak in Korea.…”

Section: Introductionmentioning

confidence: 99%

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Wideband bended CPS‐to‐microstrip transition for millimeter‐wave antenna‐detector module

Lee

Kim

Mohyuddin

et al. 2020

Micro & Optical Tech Letters

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In this article, the design of a new compact transition with two bended structures for millimeter‐wave (W/F‐band) antenna‐detector module is presented. The millimeter‐wave antenna is a dual dipole antenna fed by a coplanar stripline (CPS). Due to small size of the antenna‐detector, the CPS line impedance tends to be very high (~160 Ω). The down‐converted broadband microwave signal in the CPS is channeled to a 50 Ω microstrip line using a CPS‐to‐microstrip line transition (balun). If the start frequency of the transition is low, the conventional straight balun tends to be very long. In order to reduce transition length, the transition with bended parts while optimizing the impedance tapering based on the analytical formulas (conformal mapping) is chosen. In the proposed transition design, a transition with two bends in 120° is designed and implemented. The measured results show the maximum insertion loss of 1.5 dB in the frequency range of 1.8 to 17.8 GHz. Also, the return loss of the proposed transition is greater than 10 dB from 1.8 to 20 GHz.

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Section: Simulation and Measurementmentioning

confidence: 97%

Section: Design and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wideband bended CPS‐to‐microstrip transition for millimeter‐wave antenna‐detector module

Lee

Kim

Mohyuddin

et al. 2020

Micro & Optical Tech Letters

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“…본 논문에서는 등각사상의 해석적인 방법으로 초광대 역 마이크로스트립-평행스트립 선로 전이구조의 분석 및 설계를 제안한다. 본 연구진은 다양한 전이구조에 대해 등각사상을 사용하여 분석 및 해석을 수행해 왔으며, 이 과정을 통해 얻은 해석적 특성임피던스 계산식을 통해 최 적으로 정합함으로써 초광대역 특성을 얻은 바 있다 [7]～ [10] . [7] .…”

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Development of the Ultra-Wideband Microstrip-to-Parallel Stripline Transition Based on Conformal Mapping

Lee¹,

Kim²,

Choi³

2020

J. Korean Inst. Electromagn. Eng. Sci.

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A novel analysis and design method for an ultrawideband transition structure between a microstrip and parallel stripline based on conformal mapping is proposed. The line capacitance of each cross-sectional area along the transition is calculated by applying the Schwarz-Christoffel transformation, and the corresponding characteristic impedance is derived analytically. To design the proposed transition structure with ultrawideband operation, a 50-Ω characteristic impedance is maintained throughout the transition sections. Measured and simulated results show excellent performance, with an insertion loss of less than 1 dB and return loss of more than 10 dB from DC to 40 GHz.

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Design of an ultra‐wideband coplanar strip‐to‐parallel stripline transition using an analytical model based on conformal mapping

Lee

Kim

Mohyuddin

et al. 2020

Micro & Optical Tech Letters

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A new design method of an ultra‐wideband coplanar strip (CPS)‐to‐parallel stripline (PSL) transition is presented. The proposed design is based on an analytical transition model obtained by conformal mapping. The proposed transition consists of a CPS‐to‐asymmetric PSL transition and an asymmetric PSL‐to‐PSL transition. The conductor shapes of the transition at top and bottom sides of the substrate are adjusted to obtain the optimal impedance matching and smooth field transformation. For measurements, the proposed transition is designed in a back‐to‐back configuration. To verify the proposed design, two transitions with different substrates are designed and fabricated. The PSL impedance is set at 50 Ω, but the CPS impedances are set at 147 and 120 Ω, respectively. The measured insertion loss of <1 dB and return loss of >10 dB have been obtained for more than 30 and 20 GHz bandwidths, respectively.

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Asymmetric Ultra-Wideband Microstrip-to-Coplanar Stripline Transition

Cited by 18 publications

References 7 publications

Wideband bended CPS‐to‐microstrip transition for millimeter‐wave antenna‐detector module

Wideband bended CPS‐to‐microstrip transition for millimeter‐wave antenna‐detector module

Development of the Ultra-Wideband Microstrip-to-Parallel Stripline Transition Based on Conformal Mapping

Design of an ultra‐wideband coplanar strip‐to‐parallel stripline transition using an analytical model based on conformal mapping

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