[54] RF POWER DIVIDER
[75] Inventor: Wook Kim, Seoul, Rep. of Korea
[73] Assignee: Samsung Electronics Co., Ltd., Rep. of Korea
[21] Appl. No.: 09/040,160
[22] Filed: Mar. 17, 1998
[30] Foreign Application Priority Data
Apr. 26, 1997 [KR] Rep. of Korea 97-15761
[51] Int. CI.7 H01P 5/12
[52] U.S. CI 333/124; 333/128
[58] Field of Search 333/124, 128,
333/136
[56] References Cited
U.S. PATENT DOCUMENTS
4,556,856 12/1985 Presser 333/124
4,875,024 10/1989 Roberts 333/128 X
5,430,418 7/1995 Blodgett 333/124 X
5,469,129 11/1995 Dydyk 333/124
FOREIGN PATENT DOCUMENTS
2158295 11/1985 United Kingdom .
2204186 11/1988 United Kingdom .
OTHER PUBLICATIONS
R.C. Webb, Power Divider/Combiners: Small Size, Big Specs, Microwaves, Nov. 1981, pp. 67-74 333-128.
Primary Examiner—Paul Gensler
Attorney, Agent, or Firm—Dilworfh & Barrese
[57] ABSTRACT
An RF power divider is provided for use in a UHF-band high-power amplifier of a radio transmitter. The RF power divider includes: a single input port; first and second output ports; a first microstrip line coupled to the input port; first and second coils coupled in parallel to an output side of the first microstrip line; a second microstrip line coupled between an output side of the first coil and the first output port; a third microstrip line coupled between an output side of the second coil and the second output port; a first capacitor coupled between a ground and a contact point of the first microstrip line and the first and second coils; a resistor coupled between a contact point of the first coil and the second microstrip line, and a contact point of the second coil and the third microstrip line; and a second capacitor coupled in parallel to the resistor. Accordingly, the present invention provides a Wilkinson power divider implemented in a concentrated integer equivalent circuit, in which X/4 lines are formed by the coils and the capacitors being lumped elements instead of microstrip lines.
6 Claims, 9 Drawing Sheets
