11-11-2014, 11:32 PM
The story of a microstrip patch antenna
The rapid development of technology of microstrip antenna began in the late 1970 's. In the early 1980 's, the main elements of microstrip antennas and arrays were pretty well known in terms of design and modeling, and workers were their courtship to improve performance of the antenna (e.g. bandwidth), and with the increased use of technology. One such application Using microstrip antennas involved in complex phased array systems, as technology microstrip antennas printed seemed ideal for low cost and high density integration with microphone or active phase IIA and T/R schemes.
The team from the University of Massachusetts (Dan Schaubert, Bob Jackson, Siegfried Yngvesson) HAD received AIR FORCE contract year to study this problem, in terms of trade-offs for various integrated phased array architectures, as well as printed theoretical modeling large HEADLIGHT antennas. direct approach builds millimeter wave year integrated array (or subset) Using a single layer of GaAs substrates have several drawbacks. First, there is not enough space at all on one layer to keep the antenna elements, the active phase shift module and scheme of the amplifier offset and RF line feed line. Secondly, the high dielectric constant of the semiconductor GaAs substrates big fan I was a bad choice for the bandwidth of the antenna, Since bandwidth microstrip antenna is best for low dielectric constant of the substrate. And if the thickness of the substrate increases a year trying to improve throughput, feed and parasitic radiation surface wave increases the power increases. Ultimately this leads to the problem of the last scan, and the blindness of the antenna may not receive or transmit at a certain angle scanning. Because of these and other issues, they looked at the use of two or more layered substrates. One of the obvious was the ability to use two back to back with substrates through contacts. Whether it will allow a lot of space, and had the advantage of allowing the use of GaAs (or similar) for a single substrate material, with low dielectric constant for the antenna elements. The main problem with this approach, a large number that was challenges presented through the holes made in terms of profitability and reliability. They looked at the possibility of using bilateral substrate with antennas on a printed slot-fed microstrip lines-but radiant element was unacceptable to bidirectional.
At some point in the summer of 1984, they came up with the idea of combining the two geometries using the slot or aperture for microstrip line power to the resonant microstrip antenna.
After considering the application of small hole communication theory to the fields of a microstrip line and microstrip antennas, they have developed a prototype for testing. Their intuitive theory was very simple, but good enough to offer the maximum connection that more appear centered When it through the hole, with an aperture located below the center of the patch, and focused on the excitement of the magnetic field of the patch.
The first Aperture coupled microstrip antennas are manufactured and tested was a graduate student, Buck, August 1, 1984, Allen at the University of Massachusetts Lab antenna this antenna uses. 0062 "Duroid substrates with a circular hole, and run at a frequency of 2 Ghz. As is the case with most original developments of antennas, the prototype had been developed without any thorough analysis or CAD-year only an intuitive idea of how fields could possibly pair through a small hole. They were pleasantly surprised to discover that the first prototype worked almost perfectly-it was the resistance and the pattern was good. The most important thing is that the relationship of the diaphragm Is so small that it was back radiation from the hole was much smaller than the forward in the radiation level.
The geometry of the primary aperture coupled patch antenna is Radiating microstrip element patch. engraved on the top of the antenna, and the substrate a microstrip lines etched in the bottom of the supply of substrates. Thickness and dielectric constant of the two substrates may be chosen Independently to optimize amaranth various electrical functions and circuits. Although the original prototype circular antenna coupling the diaphragm Used BU quickly realized that the use of rectangular slits will improve communication, for the square aperture, the STI increased magnetic polarizability. Most aperture coupled microstrip antennas now using rectangular slots and their varieties.
The rapid development of technology of microstrip antenna began in the late 1970 's. In the early 1980 's, the main elements of microstrip antennas and arrays were pretty well known in terms of design and modeling, and workers were their courtship to improve performance of the antenna (e.g. bandwidth), and with the increased use of technology. One such application Using microstrip antennas involved in complex phased array systems, as technology microstrip antennas printed seemed ideal for low cost and high density integration with microphone or active phase IIA and T/R schemes.
The team from the University of Massachusetts (Dan Schaubert, Bob Jackson, Siegfried Yngvesson) HAD received AIR FORCE contract year to study this problem, in terms of trade-offs for various integrated phased array architectures, as well as printed theoretical modeling large HEADLIGHT antennas. direct approach builds millimeter wave year integrated array (or subset) Using a single layer of GaAs substrates have several drawbacks. First, there is not enough space at all on one layer to keep the antenna elements, the active phase shift module and scheme of the amplifier offset and RF line feed line. Secondly, the high dielectric constant of the semiconductor GaAs substrates big fan I was a bad choice for the bandwidth of the antenna, Since bandwidth microstrip antenna is best for low dielectric constant of the substrate. And if the thickness of the substrate increases a year trying to improve throughput, feed and parasitic radiation surface wave increases the power increases. Ultimately this leads to the problem of the last scan, and the blindness of the antenna may not receive or transmit at a certain angle scanning. Because of these and other issues, they looked at the use of two or more layered substrates. One of the obvious was the ability to use two back to back with substrates through contacts. Whether it will allow a lot of space, and had the advantage of allowing the use of GaAs (or similar) for a single substrate material, with low dielectric constant for the antenna elements. The main problem with this approach, a large number that was challenges presented through the holes made in terms of profitability and reliability. They looked at the possibility of using bilateral substrate with antennas on a printed slot-fed microstrip lines-but radiant element was unacceptable to bidirectional.
At some point in the summer of 1984, they came up with the idea of combining the two geometries using the slot or aperture for microstrip line power to the resonant microstrip antenna.
After considering the application of small hole communication theory to the fields of a microstrip line and microstrip antennas, they have developed a prototype for testing. Their intuitive theory was very simple, but good enough to offer the maximum connection that more appear centered When it through the hole, with an aperture located below the center of the patch, and focused on the excitement of the magnetic field of the patch.
The first Aperture coupled microstrip antennas are manufactured and tested was a graduate student, Buck, August 1, 1984, Allen at the University of Massachusetts Lab antenna this antenna uses. 0062 "Duroid substrates with a circular hole, and run at a frequency of 2 Ghz. As is the case with most original developments of antennas, the prototype had been developed without any thorough analysis or CAD-year only an intuitive idea of how fields could possibly pair through a small hole. They were pleasantly surprised to discover that the first prototype worked almost perfectly-it was the resistance and the pattern was good. The most important thing is that the relationship of the diaphragm Is so small that it was back radiation from the hole was much smaller than the forward in the radiation level.
The geometry of the primary aperture coupled patch antenna is Radiating microstrip element patch. engraved on the top of the antenna, and the substrate a microstrip lines etched in the bottom of the supply of substrates. Thickness and dielectric constant of the two substrates may be chosen Independently to optimize amaranth various electrical functions and circuits. Although the original prototype circular antenna coupling the diaphragm Used BU quickly realized that the use of rectangular slits will improve communication, for the square aperture, the STI increased magnetic polarizability. Most aperture coupled microstrip antennas now using rectangular slots and their varieties.
