Realization of miniaturized branch-line coupler using lowpass microstrip filters

Letavin, Denis A.; Mitelman, Yuriy E.; Chechetkin, Victor A.

doi:10.1109/lapc.2015.7366013

Cited by 16 publications

(3 citation statements)

References 6 publications

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“…Branch‐line couplers with a 90° phase shift between the two output ports play a crucial role in these systems because they are required to connect the balanced circuit, for example, between the balanced mixer and the power amplifier. Several studies of miniaturized branch‐line coupler designs using different methods have been conducted in recent years .…”

Section: Introductionmentioning

confidence: 99%

“…In the Zong et al study, the size of the proposed coupler was only 17.6% the size of a conventional one operating at the same frequency, but the complex structure was a problem for design and fabrication, and integration in wireless communication systems was challenging because of the special substrate. More recently, Letavin et al proposed a compact branch‐line coupler using fifth‐ to ninth‐order low‐pass microstrip filters on FR4 substrate at a 2 GHz operating frequency. The simple structures of the coupler were favorable for design and fabrication, and the FR4 substrate was easy for integration work; however, the size was reduced by only 67–69% compared with that obtained using a conventional coupler at the same frequency.…”

Section: Introductionmentioning

confidence: 99%

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Compact planar microstrip branch‐line coupler using equal difference structure

Chen

Yuan

Liou

et al. 2017

Micro & Optical Tech Letters

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microstrip line inductance L ð Þ slightly decreases with the increase of "n" due to the slight increase of mutual inductance (opposite polarity) between the microstrip line and ground plane.In Figure 7, the effect of varying the dimensions ðp5d5gÞ on the equivalent electrical parameters are illustrated while "n" is fixed at 7 mm. The intrinsic capacitance C c ð Þ and inductance L c ð Þ of the CSRR unit cell decreases because of the expanded capacitive gaps and reduced electrical path length of the inner disc conductors connecting to the ground plane. Besides this, the inductance L ð Þ of the microstrip line increases due to the decreasing of mutual inductance (lesser magnetic flux linkage to the ground plane) between the CSRR and microstrip line. This property can be used to control the pole frequencies. CONCLUSIONIn this letter, a more accurate electrical parameter extraction method of rectangular CSRR is proposed for UWB range which is based on the information of four characteristic frequencies found in the scattering response. The proposed technique is used for a detailed parametric analysis of CSRR unit cell. This present study will be helpful for optimization of CSRR-based microstrip designs. ACKNOWLEDGMENTAuthors are personally thankful to Mr. L. Murmu of ISM, Dhanbad for supporting this work.ABSTRACT: A compact planar microstrip branch-line coupler using equal difference structures was implemented and measured. Using the equal difference structure effectively reduced the quarter-wavelength microstrip line and minimized the branch-line coupler dimension as a result of a novel triangular profile of the structure streamlining the circuit area. Compared with that of conventional planar microstrip branchline couplers, the optimized area of the proposed coupler was reduced by 84.2% at a 900 MHz operating frequency. The measured insertion loss, isolation, and return loss performances achieved superior results than 3.9, 23, and 16 dB, respectively, and the measured phase difference between the two output ports was 908 6 0.18. Notably, a coupler using equal difference structures can be implemented in standard printed circuit board processes without any lumped elements, bonding wires, or via-holes, easing integration with wireless communication systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact planar microstrip branch‐line coupler using equal difference structure

Chen

Yuan

Liou

et al. 2017

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…Chun et al used lumped-distributed elements (open stubs) to obtain smaller sizes [1], while Jung et al in [2] and [3] transformed lines with distributed capacitors to use the inner area effectively. Recent authors' investigations also covered aspects of the design of small conventional microstrip branch-line couplers [4,5].…”

Section: рис 1 структурная схема установкиmentioning

confidence: 99%