Multiband antenna with associated r.f. amplifier

Claim 1

An improved multiband antenna comprising a pair of elongated antenna elements, one of said elements tuned to a first frequency and the other of said elements tuned to a second frequency different from said first frequency, said elements arranged substantially parallel to each other; an amplifier integrally connected to said elements, said amplifier including a first transistor having its base electrode electrically connected to said first element and a second transistor having its base electrode electrically connected to said second element, the input impedance of each of said transistors being adjusted to equal approximately the optimum noise matching impedance of its corresponding antenna element at the frequency for which it is tuned; a single radio frequency transformer having its primary winding the ends of which are connected to the collector elements of both said transistors and a center tap connection through which DC voltage is applied to said transistors; means providing a radio frequency ground for said center tap connection; said transformer including a single secondary winding which combines the outputs of both said transistors into a single output.