On the Use of U-Slots in the Design of Dual-and Triple-Band Patch Antennas
ABSTRACT The general method of using U-slots to design dual- and triple-band patch antennas is described. In this approach, one starts with a broadband patch antenna, which can consist of one or more patches. When a U-slot is cut in one of the patches, a notch is introduced into the matching band, and the antenna becomes a dual-band antenna. If another U-slot is cut in the same patch or in another patch, a triple-band antenna results. This method is applied to the L-probe-fed patch, the M-probe-fed patch, as well as the coaxially fed and aperture-coupled stacked patches. It is found that the patterns and gains of the dual-and triple-band antennas are similar to those of the original broadband antenna. Because the band notches introduced by the U-slots occur within the bandwidth of the antenna without slots, this method is suitable when the frequency ratios of the adjacent bands are small, usually less than 1.5.
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ABSTRACT: Two large and low-profile panel antenna arrays, used as receiving and transmitting antennas for mobile satellite communications, are described. The receiving and transmitting arrays have overall dimensions of 120 cm × 20.7 cm × 1.3cm and 107.5 cm × 20.4 cm × 1.7 cm, respectively. They exhibit high gains and adequate efficiencies, due to integrated array designs. For the receiving panel array, a method using a number of high-efficiency subarrays, combined with a novel active integrated global feed network, is proposed. For the transmitting panel array, a number of high-efficiency subarrays, together with a novel compact waveguide feed network, is employed. Based on the above techniques, two large panel antenna arrays were successfully developed. We present the detailed designs of the subarrays, the passive and active feed networks, and the vertical transitions. Simulated and experimental results showed that the designed receiving and transmitting panel arrays achieved measured gains and efficiencies of 34.1 dBi and 48.2%, and 33.5 dBi and 36.3%, respectively, in each band. This indicated that the proposed antenna panels are good candidates for future satellite communications applications.IEEE Antennas and Propagation Magazine 12/2012; 54(6):256-268. DOI:10.1109/MAP.2012.6387841 · 1.15 Impact Factor
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ABSTRACT: Two large and low profile panel antenna arrays used as receiving and transmitting antennas for mobile satellite communications are described. The two arrays have an overall size of 120×20.7×1.3cm3 and 107.5×20.4×1.7cm3, respectively, and exhibit high gains and adequate efficiencies due to effective array designs. For the receiving panel array, a method using a number of high efficiency sub-arrays combined with a novel active integrated global feed network is proposed. For the transmitting panel array, a number of high efficiency sub-arrays together with a novel compact waveguide feed network is employed. Based on the above techniques, two large panel antenna arrays are successfully developed. We present detailed designs of the sub-arrays, the passive and active feed networks, and the vertical transitions. Simulated and experimental results show that the designed receiving and transmitting panel arrays achieve the measured gains and efficiencies of 34.1dBi, 48.2% and 33.5dBi, 36.3%, respectively, which indicates that the proposed antenna panels are good candidates for future satellite communications applications.2012 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP); 08/2012
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ABSTRACT: In this paper, the design, Optimization and simulation of a dual-band coaxial-fed 2×2 rectangular U-Slot microstrippatch antenna array for wireless sensor network applications is presented. It operates on 2.1GHz and 3.5GHz bands. A MIMO antenna is proposed for high speed WSNs based communication standards that operates in 1-5GHz frequency range. Antenna design and simulation is performed in Agilent ADS Momentum using Rogers TMM3 substrate (εr =3.27 and h=6.35mm). The maximum achieved gain for2 x 2 U-slot rectangular patch antenna array is lldBi. Substrate losses are also taken into account during simulation process. Simple design procedure and optimization techniques are also discussed to design a single element dual-band patch antenna. The proposed array may be used as a template to form larger arrays.Sensor Network Security Technology and Privacy Communication System (SNS & PCS), 2013 International Conference on; 01/2013