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According to the demands of modern communication products, Laptop/Tablet, at least four antennas are required to provide 3G WCDMA, 4G LTE, WiFi, BT, GPS, and Wimax. Recently, most antennas have employed planar inverted-F antenna (PIFA) design. However, the conventional PIFA suffers from narrow bandwidth and the relative isolation is another issue when high efficiency of antennas is demanded. If we...
A wideband microstrip-coplanar stripline-fed circularly polarized spiral antenna is presented. An electromagnetic coupled wideband balun from microstrip line to coplanar stripline is developed to feed the spiral antenna. The antenna shows a measured return loss of better than 10 dB from 6.85 GHz to 11.9 GHz. The axial ratio is smaller than 3 dB from 7 to 11.5 GHz
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