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US 4,229,826 AGranted
Wide band impedance matching device
OwnerC. L. Wanzerinventor
Life of this patent
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Abstract
A wide band impedance matching device is described for matching the impedance of an antenna transmission line to a radio transceiver over a wide band of radio frequencies. The device includes an impedance matching network having an inductor and two capacitors that electrically interconnect in either a capacitance "T" mode or a capacitance ".pi." mode. The device also includes an efficient bypass circuit that is capable of electrically bypassing the impedance matching network to effectively directly interconnect the antenna transmission line to the transceiver.
Claims10
A wide band impedance matching device for coupling a radio transceiver to an antenna transmission line, comprising:
- a chassis housing;
- an input connector mounted to the housing and adapted to be operatively connected to the radio transceiver;
- an output connector mounted to the housing and adapted to be operatively connected to the antenna transmission line;
- a double pole, double throw manual bypass switch means having a first pair of terminals that are electrically connected to a second pair of terminals when the switch is in a "BYPASS" position and that are electrically connected to a third pair of terminals when the switch is in an "ON" position;
- a single coaxial feed cable within the housing coupled to the input connector, the output connector and the manual bypass switch having a center conductor which interconnects one of the connectors with one terminal of the first terminal pair and having another conductor coaxial with said center conductor which interconnects the other connector with the other terminal of the first pair;
- an impedance matching network electrically connected between the third pair of terminals for manually adjusting the impedance therebetween to match the impedance of the transceiver with the impedance of the antenna transmission line when the bypass switch means is in the "ON" position;
- and
- bridging means electrically interconnecting the second pair of terminals so that when the bypass switch means is in the "BYPASS" position the transceiver and antenna transmission line are directly interconnected through the coaxial cable to bypass the impedance matching network and thereby cause a minimum of radio signal attenuation loss.
5 more elements
A wide band impedance matching device for coupling a radio transceiver to an antenna transmission line, comprising:
- a chassis housing;
- an input connection mounted to the housing and adapted to be operatively connected to the radio transceiver;
- an output connector mounted to the housing and adapted to be operatively connected to the antenna transmission line;
- a double pole, double throw manual bypass switch means having a first pair of terminals that are electrically connected to a second pair of terminals when the switch is in a "BYPASS" position and that are electrically connected to a third pair of terminals when the switch is in an "ON" position.
- a coaxial cable within the housing coupled to the input connector, the output connector and the manual bypass switch having a center conductor which interconnects one of the connectors with one terminal of the first pair and having another conductor coaxial with said center conductor which interconnects the other connector with the other terminal of the first pair;
- bridging means electrically interconnecting the second pair of terminals so that when the bypass switch means is in the "BYPASS" position the transceiver and antenna transmission line are directly interconnected through the coaxial cable with a minimum of radio signal attenuation loss;
- two variable capacitors mounted in the housing;
- a first manual control means mounted to the housing and operatively connected to one variable capacitor for adjusting the one variable capacitor to vary the capacitance value of the one capacitor;
- a second manual control means mounted to the housing and operatively connected to the other variable capacitor for adjusting the other variable capacitor to vary the capacitance value of the capacitor;
- a variable inductor mounted to the housing;
- a third manual control means mounted to the housing and operatively connected to the variable inductor for adjusting the variable inductor to vary the inductance value of the inductor;
- and
- a manual mode switching means mounted to the housing and operatively connected to the two variable capacitors and the variable inductor for electrically connecting the capacitors and inductor in either a capacitance "T" mode for use in matching the transceiver to an antenna transmission line having a low impedance or a capacitance ".pi." mode for use in matching the transceiver to an antenna transmission line having a high impedance.
10 more elements
Dependencies are inferred from the claim text.