초록 ▼

A multi-band multi-element directional antenna array having a driven element and at least one parasitic element with a network at the center of each element interconnecting element opposite side radiators. While some of these would be a driven element and either a reflector or director parasitic ele

A multi-band multi-element directional antenna array having a driven element and at least one parasitic element with a network at the center of each element interconnecting element opposite side radiators. While some of these would be a driven element and either a reflector or director parasitic element array most applications call for at least three elements, a driven element, a reflector element and a director element, and for some applications, additional parasitic director elements are added. While antenna arrays embodying features hereof may be adapted as two band f1 f2, f2 f3, or f1 f3 antenna arrays, primary useage would be in a three radio band f1, f2, f3 version with band nominal center frequencies related, approximately by the progression 1, 1.5, 2 (example 14, 21, and 28 MHz). Reflector and director elements with their center networks as parasitic elements are structured to resonate at frequencies up to ten percent displaced from respective band operating frequencies－reflector elements at lower frequencies and directors at higher frequencies. Some of the arrays employ folded elements for improved unidirectional radiation patterns and structural advantages.

대표청구항 ▼

In a multi-band multi-element directional antenna array having a driven element means formed of two opposed sections each a half wavelength at the midband frequency and parasitic element means: driven element impedance matching network means; a parasitic element; parasitic element center network mea

In a multi-band multi-element directional antenna array having a driven element means formed of two opposed sections each a half wavelength at the midband frequency and parasitic element means: driven element impedance matching network means; a parasitic element; parasitic element center network means; signal feed line means; signal coupling means interconnecting said signal feed line means and said driven element; and with said driven element matching network means and said parasitic element center network means being networks enabling respective driven and parasitic elements to respond, as an antenna array, on all bands of said multi-band directional antenna for providing a unidirectional radiation pattern.