## Abstract The new ursane‐type triterpenoid glycoside, asiaticoside G (I), is isolated along with five known triterpenoids and four flavonoids from the leaves of Centella asiatica. Their chemical structures are elucidated and bioactivities are evaluated.
Design of three new types of active quasi-circulator modules
✍ Scribed by Reza Bahri; Abdolali Abdipour; Gholamreza Moradi
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 380 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
Abstract
Analysis and design of three novel active quasi‐circulator modules are presented, which use the nonreciprocal properties of microwave unilateral power divider/combiner and amplifiers.These modules have many variations and can be used for very wide frequency range depending on the type of the unilateral amplifier used. Also, they can be used in MMICs as active circulators and also in other high‐frequency applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 689–694, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24998
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