FM antenna
First Claim
1. An antenna comprising:
- an electrically insulating substrate;
an electrically conductive loop element on one side of said substrate, said loop element having first and second terminals which are adjacent each other;
an electrically conductive tap element on an opposite side of said substrate, said tap element extending substantially parallel to said loop element and having a length equal to approximately one half of the length of said loop element, said tap element having a third terminal which is diametrically opposite said first and second terminals of said loop element, said third terminal being electrically connected to said loop element, said tap element having a fourth terminal which is adjacent said second terminal of said loop element;
a first large capacitor plate connected to said first terminal;
a second large capacitor plate connected to said second terminal and electrically insulated from said first large capacitor plate, said first and second capacitor plates facing each other and forming a first capacitor connected between said first and second terminals;
a first small capacitor plate connected to said fourth terminal; and
a second small capacitor plate connected to said second terminal and electrically insulated from said first small capacitor plate, said first and second small capacitor plates facing each other and forming a second capacitor connected between said second and fourth terminals.
2 Assignments
0 Petitions
Accused Products
Abstract
An antenna assembly which is suited for receiving FM signals, comprises a pair of insulating disc shaped substrates which each have conductive patterns deposited on one surface thereof. The first insulating substrate has an electrically conductive loop element extending around approximately 360° on the first substrate. The loop element terminates at first and second terminals which are adjacent each other. An electrically conductive tap element is deposited on one surface of the second substrate. The tap element extends around approximately 180° and is parallel to half of the length of the loop element. On end of the tap element is electrically connected to a mid-point of the loop element intermediate its first and second terminals. Plate areas are deposited on the substrate and are electrically connected to selected terminals of the loop and tap elements to form capacitors. A first relatively large value capacitor is thus defined between the first and second terminals of the loop element and a second smaller value capacitor is defined between the second terminal of the loop element and opposite end terminal of the tap element. This forms a passive antenna. An active antenna can be formed using discreet components as the capacitors. An amplifier is connected over a signal capacitor to an output of the antenna to form an active antenna assembly.
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Citations
16 Claims
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1. An antenna comprising:
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an electrically insulating substrate; an electrically conductive loop element on one side of said substrate, said loop element having first and second terminals which are adjacent each other; an electrically conductive tap element on an opposite side of said substrate, said tap element extending substantially parallel to said loop element and having a length equal to approximately one half of the length of said loop element, said tap element having a third terminal which is diametrically opposite said first and second terminals of said loop element, said third terminal being electrically connected to said loop element, said tap element having a fourth terminal which is adjacent said second terminal of said loop element; a first large capacitor plate connected to said first terminal; a second large capacitor plate connected to said second terminal and electrically insulated from said first large capacitor plate, said first and second capacitor plates facing each other and forming a first capacitor connected between said first and second terminals; a first small capacitor plate connected to said fourth terminal; and a second small capacitor plate connected to said second terminal and electrically insulated from said first small capacitor plate, said first and second small capacitor plates facing each other and forming a second capacitor connected between said second and fourth terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An antenna assembly comprising:
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an electrically insulating substrate; an electrically conductive loop element on one side of said substrate, said loop element having first and second terminals which are adjacent each other; an electrically conductive tap element on an opposite side of said substrate, said tap element extending substantially parallel to said loop element and having a length equal to approximately one half the length of said loop element, said tap element having a third terminal which is diametrically opposite said first and second terminals of said loop element, said third terminal being electrically connected to said loop element, said tap element having a fourth terminal which is adjacent said second terminal of said loop element; a first capacitor connected between said first and second terminals; a second capacitor connected between said second and fourth terminals; a signal capacitor having one end connected to said fourth terminal, said signal capacitor having an opposite end; amplifier means connected to said opposite end of said signal capacitor for amplifying a signal on said signal capacitor originating from said loop and tap elements, said amplifier means including a single output terminal for transmitting an amplified signal and for receiving power for said amplifier means; connector means for supplying a signal to a radio receiver and for receiving power; and a cable having first and second conductors connected between said amplifier means and said connector means, said first conductor being connected to said single output terminal for supplying power to said amplifier means and for supplying a signal from said amplifier means to said connector means, said second conductor and said first terminal of said loop element being connected to ground. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification