Broadband antennae employing coaxial transmission line sections

Details Broadband antennae employing coaxial transmission line sections Broadband antennae employing coaxial transmission line sections

1982-06-01

1984-10-23

Lieberman, Eli

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343815, 343822, H01Q 916

Patent

active

044791305

ABSTRACT:
The deviation in operating frequency which antenna system elements can handle without serious transmission line mismatch is increased by constructing the antenna such that the inner portions (40, 42) of its legs (40,48 and 42,50) are formed of coaxial transmission line connected so that the outer conductor serves as part of the radiator, and so that the inner and outer conductor of the line cooperate to form compensation stubs whose impedance varies with frequency in a manner to cancel or oppose the reactance which the antenna legs exhibit with frequency change. The stubs are connected in series or in parallel with the antenna feed point and parasitic elements. Surge impedance is selected so that the antenna driven elements (nearly resistive) and signal source, and parasitic elements that incorporate the invention, are mismatched at band end frequencies and center band frequency in apparoximately like amount. The impedance is selected such that the antenna (somewhat reactive) and signal source are more nearly matched at frequencies midway between center band frequency and band edge frequencies.

REFERENCES:
patent: 2313046 (1943-03-01), Bruce
patent: 2321454 (1943-06-01), Brown
patent: 2539680 (1951-01-01), Wehner
patent: 2648768 (1953-08-01), Woodward
patent: 2975423 (1961-03-01), Wells
patent: 3151327 (1964-09-01), Levy et al.
patent: 3358286 (1967-12-01), Heins
patent: 3582952 (1971-06-01), Heins
patent: 3656167 (1972-04-01), Lea
patent: 4209790 (1980-06-01), Newcomb

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