This article has covered the principles of operation and design guidelines of microstrip reflecta... more This article has covered the principles of operation and design guidelines of microstrip reflectarrays, which have been intensively researched over the last two decades at various parts of the world. The reflectarrays that have been described here are able to produce single- and multibeam operation with linear, dual-linear, or circular polarization. For the target gain of up to 40 dB they are capable of providing high radiation efficiency that is comparable with their parabolic reflector counterparts. The use of many phasing elements in the reflectarray aperture allows a contoured beam operation to be obtained that is required in direct broadcast satellite systems. Designs of such reflectarrays based on a flexible phase-only synthesis procedure, accompanied by examples of working prototypes, have been covered in detail. Another interesting application, which has been described here, deals with multibeam reflectarrays, either single-fed or multi-fed spot and/or shaped beams. The design principles accompanied by several examples of such antenna have been presented. Finally, it has been shown that the reflectarray concept can also be utilized in folded reflector antennas for automotive radar and communication applications.
... Author(s), Tsai, Feng-Chi Eddie. ... Two identical hard horn antennas with an approximately u... more ... Author(s), Tsai, Feng-Chi Eddie. ... Two identical hard horn antennas with an approximately uniform field across the aperture for signal launching and collecting complete the design and development of this space-level power combiner. ...
2008 International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, 2008
In this paper, we show that the design of a UWB Butler matrix can be accomplished using couplers ... more In this paper, we show that the design of a UWB Butler matrix can be accomplished using couplers and phase shifters in microstrip/slot technology. As a result of the proposed approach, we present the design of a 4-element switched-beam array antenna operating between 3.1 and 10.6 GHz. An UWB switched-beam array antenna formed by four tapered slot antennas and a
In this paper, a new excitation technique for a printed planar inverted F antenna (PIFA) is descr... more In this paper, a new excitation technique for a printed planar inverted F antenna (PIFA) is described to obtain multi-band operation. In the proposed technique, the printed PIFA is fed from a microstrip line which is coupled to open-end slots in a finite ground. A strong coupling between the microstripline and the ground slots is responsible for generating new resonant frequencies in addition to the one generated by the PIFA element. In contrast to the traditional coaxial probe feed, the use of the microstrip feed allows for coupling to arbitrarily located and orientated ground slots. The advantage of the proposed technique is demonstrated in design examples of multi-band PIFA operating within the 2.4 to 6 GHz frequency band. In the proposed design strategy, the PIFA element of quarter wave length is designed for operation at 2.45 GHz while the location and dimensions of open-ended ground slots are selected to obtain operation at higher frequencies. Two configurations of open-end slots in the ground plane are demonstrated. In the first configuration, an open-end ground slot is chosen to be parallel while in the second configuration the ground slot is selected to be perpendicular with respect to the PIFA element. The multi-band PIFA performance is assessed in terms of return loss, radiation pattern and distribution of surface currents around the primary radiating element and the ground slots at resonant frequencies. The antennas have been fabricated and the experimental results are in good agreement with the simulation.
This article has covered the principles of operation and design guidelines of microstrip reflecta... more This article has covered the principles of operation and design guidelines of microstrip reflectarrays, which have been intensively researched over the last two decades at various parts of the world. The reflectarrays that have been described here are able to produce single- and multibeam operation with linear, dual-linear, or circular polarization. For the target gain of up to 40 dB they are capable of providing high radiation efficiency that is comparable with their parabolic reflector counterparts. The use of many phasing elements in the reflectarray aperture allows a contoured beam operation to be obtained that is required in direct broadcast satellite systems. Designs of such reflectarrays based on a flexible phase-only synthesis procedure, accompanied by examples of working prototypes, have been covered in detail. Another interesting application, which has been described here, deals with multibeam reflectarrays, either single-fed or multi-fed spot and/or shaped beams. The design principles accompanied by several examples of such antenna have been presented. Finally, it has been shown that the reflectarray concept can also be utilized in folded reflector antennas for automotive radar and communication applications.
... Author(s), Tsai, Feng-Chi Eddie. ... Two identical hard horn antennas with an approximately u... more ... Author(s), Tsai, Feng-Chi Eddie. ... Two identical hard horn antennas with an approximately uniform field across the aperture for signal launching and collecting complete the design and development of this space-level power combiner. ...
2008 International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, 2008
In this paper, we show that the design of a UWB Butler matrix can be accomplished using couplers ... more In this paper, we show that the design of a UWB Butler matrix can be accomplished using couplers and phase shifters in microstrip/slot technology. As a result of the proposed approach, we present the design of a 4-element switched-beam array antenna operating between 3.1 and 10.6 GHz. An UWB switched-beam array antenna formed by four tapered slot antennas and a
In this paper, a new excitation technique for a printed planar inverted F antenna (PIFA) is descr... more In this paper, a new excitation technique for a printed planar inverted F antenna (PIFA) is described to obtain multi-band operation. In the proposed technique, the printed PIFA is fed from a microstrip line which is coupled to open-end slots in a finite ground. A strong coupling between the microstripline and the ground slots is responsible for generating new resonant frequencies in addition to the one generated by the PIFA element. In contrast to the traditional coaxial probe feed, the use of the microstrip feed allows for coupling to arbitrarily located and orientated ground slots. The advantage of the proposed technique is demonstrated in design examples of multi-band PIFA operating within the 2.4 to 6 GHz frequency band. In the proposed design strategy, the PIFA element of quarter wave length is designed for operation at 2.45 GHz while the location and dimensions of open-ended ground slots are selected to obtain operation at higher frequencies. Two configurations of open-end slots in the ground plane are demonstrated. In the first configuration, an open-end ground slot is chosen to be parallel while in the second configuration the ground slot is selected to be perpendicular with respect to the PIFA element. The multi-band PIFA performance is assessed in terms of return loss, radiation pattern and distribution of surface currents around the primary radiating element and the ground slots at resonant frequencies. The antennas have been fabricated and the experimental results are in good agreement with the simulation.
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