By Stephen A Maas
Offers an advent to basic mixer kinds, in addition to adaptations at the classical mixer designs
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The second resonant frequency f 2 also shows a decreasing trend when the angle of α increases up to 35◦ . When α is greater than 35◦ , f 2 is seen to increase with increasing angle α. 13 is achieved. 22. The two operating frequencies are seen to have the same polarization planes, and good broadside radiation patterns are observed, although relatively larger cross-polarization for H-plane radiation is seen. 23 shows the measured antenna gain for the lower and upper operating bands of a prototype with α = 24◦ .
This suggests that an antenna size reduction as large as about 56% can be achieved for the proposed antenna operated at a fixed frequency. Moreover, it is clearly seen that the impedance bandwidths of the prototypes (antennas 1–4) are all greater than that of the reference antenna. This behavior is largely owing to the meandering slots embedded in the antenna’s ground plane, which effectively lower the quality factor of the proposed antenna. 4, L = 30 mm, W = 20 mm, i = 10 mm, and ground-plane size = 50 × 50 mm2 .
Luk, C. H. Lai, and K. F. Lee, “Wideband L-probe-fed patch antenna with dual-band operation for GSM/PCS base stations,” Electron. Lett. 35, 1123–1124, July 8, 1999. 85. T. W. Chiou, H. C. Tung, and K. L. Wong, “A dual-polarization wideband circular patch antenna with hybrid feeds,” Microwave Opt. Technol. Lett. 26, 37–39, July 5, 2000. 86. S. Hienonen, A. Lehto, and A. V. Raisanen, “Simple broadband dual-polarized aperturecoupled microstrip antenna,” in 1999 IEEE Antennas Propagat. Soc. Int. Symp.