Active aerial
First Claim
1. An active aerial including an aerial element having a length which is small with respect to the wavelength associated with the operating frequency and an amplifier to which the aerial element is connected, characterized in that said amplifier comprises an active element having a grounded input and a control input to which said aerial element is coupled, means for coupling to said control input to provide a voltage potential at said control input at virtually the same potential as said grounded input.
2 Assignments
0 Petitions
Accused Products
Abstract
An active aerial for use in car radios and aerial "arrays" comprising an aerial element and an aerial connected thereto. In order to obtain a low distortion and a good signal-to-noise ratio in spite of the presence of protection diodes to prevent overloading of the amplifier by atmospherics and in spite of contamination of the aerial etc, the input of the active portion of the amplifier is virtually grounded. To this end, the amplifier is preferably an operational amplifier having a high gain factor, the signal input of which is connected to ground, both the signal coming from the aerial element and a signal fed back from an output of the amplifier being applied to the inverting signal input.
33 Citations
6 Claims
- 1. An active aerial including an aerial element having a length which is small with respect to the wavelength associated with the operating frequency and an amplifier to which the aerial element is connected, characterized in that said amplifier comprises an active element having a grounded input and a control input to which said aerial element is coupled, means for coupling to said control input to provide a voltage potential at said control input at virtually the same potential as said grounded input.
Specification