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Microstrip Transition (microstrip + transition)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

Miniaturized planar ferrite junction circulator in the form of substrate-integrated waveguide

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 1 2008
Wenquan Che
Abstract The theoretical analysis and engineering implementation of the planar substrate-integrated waveguide (SIW) ferrite junction circulator have been proposed in this article. The ferrite junction circulator is implemented in the form of SIW, taking the features of low profile, small volume and easy integration with other planar circuits. The design strategies of the device have been introduced, including the design consideration of the microstrip transition. One C-band prototype of SIW ferrite junction circulator has been fabricated and measured. The experimental results indicate the bandwidth is about 33% at ,15 dB isolation and the maximum isolation is near 40 dB. However, the insertion loss is a little big, owing to the imperfect dielectric material and fabrication inaccuracy. The SIW ferrite junction circulator and the microstrip transition are integrated into a same substrate, resulting in a very compact planar ferrite junction circulator and indicating potential applications in integrated communication and radar systems. © 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2008. [source]

A compact substrate integrated waveguide H-plane horn antenna with dielectric arc lens

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2007
Wenquan Che
Abstract An H-plane horn antenna constructed into SIW (substrate integrated waveguide) is proposed. It has a dielectric arc lens for better directivity and a simple microstrip transition as feed. The horn, the lens and the transition share the same substrate. The resulting formula from optical principles shows that the suitable dielectric lens can improve the directivity of the antenna significantly. A prototype was fabricated; the antenna size is 39.175 × 14 × 2 mm3. The frequency band is from 25.5 to 28.5 GHz. The measured gain of this antenna is about 9 dB; the bandwidth, at 10 dB return loss, is over 12%. © 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007. [source]

Ultrawideband aperture-coupled vertical microstrip transition

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 9 2007
A. M. Abbosh
Abstract Simple design guidelines for an ultrawideband aperture-coupled vertical microstrip,microstrip transition are presented. The proposed transition utilizes broadside coupling between elliptical-shaped microstrip patches at the top and bottom layers via an elliptical-shaped slot in the ground plane, which is located at the mid layer. The simulated and measured results show that the proposed transition has less than 0.75 dB insertion loss and more than 13 dB return loss across the frequency band 3.1,10.6 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2207,2209, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22667 [source]

Coplanar to microstrip transitions for on-wafer measurements

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2007
Yi Wang
Abstract Two types of via-free coplanar line to microstrip transitions are designed and tested for on-wafer measurements. The transitions are designed to fit coplanar ground-signal-ground probes. They are taper transitions with capacitive ground patches and radial stub transitions. Both structures are easy implemented and exhibit wideband transmission. The performance of the optimized taper transition is among the best demonstrated in terms of a return loss of less than ,20 dB from 5 to 15.5 GHz; this is even superior to the radial stub designs. Design information is given, which is based on full-wave simulations for the taper transition, and analytical formulations for the radial stub. The increasing bandwidth with increased angle of the radial stub is observed. The transition structures and design guidelines addressed can be used for on-wafer measurements of a wide range of microstrip circuits. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 100,103, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22056 [source]