lumped element coupler

I want to design a Lumped element coupler,can you give me some articles and examples about it ?Thank you.

There is a Wilkinson Coupler Calculator for Lumped Element.

http://www1.sphere.ne.jp/i-lab/ilab/tool/LC_WKC.htm

how?

To those who undertand only english: the main english lang. page is:
http://www1.sphere.ne.jp/i-lab/ilab/index_e.htm

That web is good.But I don't understand Janpanese,who can translate it?
and who can upload some other articles about this subject ?

may be you can serch


Wei-Shin Tung, Hsu-Hsiang Wu, and Yi-Chyun Chiang, ?Design of Microwave Wide-Band Quadrature Hybrid Using Planar Transformer Coupling Method? IEEE Transaction on Microwave Theory and Techniques, Vol. 51, No. 7, pp. 1852-1856, July. 2003.

Design of a wide-band lumped-element 3-dB quadrature coupler
Yi-Chyun Chiang; Chong-Yi Chen;
Microwave Theory and Techniques, IEEE Transactions on
Volume 49, Issue 3, March 2001 Page(s):476 - 479
Digital Object Identifier 10.1109/22.910551

i got some lumped element coupler
J. Hongerheiden, M. Ciminera, and G. Jue, ?Improved planar spiral
transformer theory applied to a miniature lumped element quadrature
hybrid,? IEEE Trans. Microwave Theory Tech., vol. 45, no. 4, pp.
543?545, Apr. 1997.

Accurate modeling of high-Q spiral inductors
in thin film multilayer technology for wireless telecommunication
applications,? IEEE Trans. Microwave Theory Tech., vol. 49, no. 4, pp.
589?599, Apr. 2001.

R. W. Vogel, ?Analysis and design of lumped- and lumped-distributedelement
directional couplers foe MIC and MMIC application,? IEEE
Trans. Microwave Theory Tech., vol. 40, no. 2, pp. 253?262, Feb. 2003.