In the first embodiment, a second line is placed adjacent the coax line between the antennas. Two basic embodiments of the isolator system of this invention as applied to an antenna array are disclosed. In four additional embodiments, which are essentially variations of the second basic embodiment, coaxial sleeves are also utilized to form the isolation system. In a second embodiment the second line is replaced by a coaxial sleeve which is also terminated at one end with a resistor having a resistance value equal to the characteristic impedance. The second line is terminated at one end by a resistor having a resistance equal to the value of the characteristic impedance. The addition of this second line forms a balanced transmission line having a given characteristic impedance. In one embodiment of the invention, the isolator is formed by placing a second line adjacent the coaxial line connected to the upper antenna. In accordance with this invention, two or more antennas are spaced several wavelengths apart, connected to coaxial feeds and choked at their adjacent ends to establish the electrical length. H01Q1/521- Means for reducing coupling between antennas Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennasĪ broadband RF isolator system for connection between RF devices such as inear antennas is disclosed.H01Q1/52- Means for reducing coupling between antennas Means for reducing coupling between an antenna and another structure.H01Q1/00- Details of, or arrangements associated with, antennas.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US6095679A external-priority Application filed by US Department of Army filed Critical US Department of Army Priority to US06/260,630 priority Critical patent/US4359743A/en Priority to CA000395807A priority patent/CA1166347A/en Application granted granted Critical Publication of US4359743A publication Critical patent/US4359743A/en Anticipated expiration legal-status Critical Status Expired - Fee Related legal-status Critical Current Links ![]() Original Assignee US Department of Army Priority date (The priority date is an assumption and is not a legal conclusion. ![]() ![]() Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) DeSantis Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US06/260,630 Inventor Charles M. Google Patents US4359743A - Broadband RF isolatorÄownload PDF Info Publication number US4359743A US4359743A US06/260,630 US26063081A US4359743A US 4359743 A US4359743 A US 4359743A US 26063081 A US26063081 A US 26063081A US 4359743 A US4359743 A US 4359743A Authority US United States Prior art keywords antenna transmission line sleeve feeder cable isolator Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
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