| US 7,489,281 B2 | ||
| Quadrifilar helical antenna | ||
| Gregory A. O'Neill, Jr., Rockledge, Fla. (US); Murray Fugate, Coral Springs, Fla. (US); Young-Min Jo, Viera, Fla. (US); John C. Farrar, Indialantic, Fla. (US); Myung Sung Lee, Seoul (Korea, Republic of); Se-hyun Oh, Seoul (Korea, Republic of); Joo Mun Lee, Kyunggi-do (Korea, Republic of); Jin Hee Yoon, Seoul (Korea, Republic of); Sang Ok Choi, Seoul (Korea, Republic of); and Eun Seok Han, Seoul (Korea, Republic of) | ||
| Assigned to Sky Cross, Inc., Melbourne, Fla. (US) | ||
| Filed on Jul. 16, 2007, as Appl. No. 11/879,208. | ||
| Application 11/879208 is a division of application No. 10/998301, filed on Nov. 26, 2004, granted, now 7,245,268. | ||
| Claims priority of provisional application 60/592011, filed on Jul. 28, 2004. | ||
| Prior Publication US 2008/0122733 A1, May 29, 2008 | ||
| Int. Cl. H01Q 9/16 (2006.01); H01Q 1/36 (2006.01) | ||
| U.S. Cl. 343—822 [343/850; 343/895] | 8 Claims |
| 1. A method for designing a quadrifilar helical antenna in a shape of a cylinder, having at least one of a predetermined height
and diameter, comprising:
determining a length of a first filar loop to present an impedance having a real component and an inductive component;
determining a length of a second filar loop to present an impedance having a real component substantially equal to the real
component of the first filar loop and having a capacitive component, wherein a magnitude of the inductive component is substantially
equal to a magnitude of the capacitive component; and
determining an impedance matching element connected to the first and the second filar loops for matching an antenna impedance
to a source impedance.
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