Millimeter wave communications system with a high performance modulator circuit
First Claim
1. A millimeter wave communications system comprising:
- A) a first millimeter wave transceiver system located at a first site capable of transmitting and receiving to and from a second site through atmosphere digital information at frequencies greater than 70 GHz and at data rates of about 1.25 Gbps or greater, said first transceiver comprising;
1) at least one antenna producing a beam having a half-power beam width of about 2 degrees or less, and2) a high performance modulator circuit comprising;
a) a diode defining a diode capacitance and a lead inductance andb) a tuning means,wherein in an “
off”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when tuned, presents a radio frequency short across a transmission line in said first transceiver stopping transmission at a transmission frequency in excess of 70 GHz andwherein in an “
on”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when out of tune, removes the radio frequency short across the transmission line permitting transmission at a transmission frequency in excess of 70 GHz; and
B) a second millimeter wave transceiver system located at said second site capable of transmitting and receiving to and from said first site digital information at frequencies greater than 70 GHz and at data rates of about 1.25 Gbps or greater, said second transceiver comprising;
1) at least one antenna producing a beam having a half-power beam width of about 2 degrees or less and2) a high performance modulator circuit comprising;
a) a diode defining a diode capacitance and a lead inductance andb) a tuning means,wherein in an “
off”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when tuned, presents a radio frequencv short across a transmission line in said first transceiver stopping transmission at a transmission frequency in excess of 70 GHz andwherein in an “
on ”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when out of tune, removes the radio frequency short across the transmission line permitting transmission at a transmission frequency in excess of 70 GHz.
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Accused Products
Abstract
A high data rate communication system operating at frequencies greater than 70 MHz and at data rates of about 1.25 Gbps or greater. Preferred embodiments include modulators with a resonant LC circuit including a diode which is back-biased for “off” (i.e., no transmit) and forward biased for “on” (or transmit). The modulator is a part of high performance transceivers for wireless, millimeter wave communications links. A preferred embodiment provides a communication link of more than eight miles which operates within the 71 to 76 GHz portion of the millimeter spectrum and provides data transmission rates of 1.25 Gbps with bit error rates of less than 10−10 . A first transceiver transmits at a first bandwidth and receives at a second bandwidth both within the above spectral range. A second transceiver transmits at the second bandwidth and receives at the first bandwidth. The transceivers are equipped with antennas providing beam divergence small enough to ensure efficient spatial and directional partitioning of the data channels so that an almost unlimited number of transceivers will be able to simultaneously use the same spectrum. In a preferred embodiment the first and second spectral ranges are 71.8+/−0.63 GHz and 73.8+/−0.63 GHz and the half power beam width is about 0.2 degrees or less. Preferably, a backup transceiver set is provided which would take over the link in the event of very bad weather conditions. In other embodiments especially useful for mobile applications at least one of the transceivers include a GPS locator.
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Citations
25 Claims
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1. A millimeter wave communications system comprising:
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A) a first millimeter wave transceiver system located at a first site capable of transmitting and receiving to and from a second site through atmosphere digital information at frequencies greater than 70 GHz and at data rates of about 1.25 Gbps or greater, said first transceiver comprising; 1) at least one antenna producing a beam having a half-power beam width of about 2 degrees or less, and 2) a high performance modulator circuit comprising; a) a diode defining a diode capacitance and a lead inductance and b) a tuning means, wherein in an “
off”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when tuned, presents a radio frequency short across a transmission line in said first transceiver stopping transmission at a transmission frequency in excess of 70 GHz andwherein in an “
on”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when out of tune, removes the radio frequency short across the transmission line permitting transmission at a transmission frequency in excess of 70 GHz; andB) a second millimeter wave transceiver system located at said second site capable of transmitting and receiving to and from said first site digital information at frequencies greater than 70 GHz and at data rates of about 1.25 Gbps or greater, said second transceiver comprising; 1) at least one antenna producing a beam having a half-power beam width of about 2 degrees or less and 2) a high performance modulator circuit comprising; a) a diode defining a diode capacitance and a lead inductance and b) a tuning means, wherein in an “
off”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when tuned, presents a radio frequencv short across a transmission line in said first transceiver stopping transmission at a transmission frequency in excess of 70 GHz andwherein in an “
on ”
state, the tuning means, diode capacitance and lead inductance all combine to form a resonant LC circuit which, when out of tune, removes the radio frequency short across the transmission line permitting transmission at a transmission frequency in excess of 70 GHz.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification