![]() 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.
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