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Cheng-Hsing HsuDepartment of Electrical EngineeringDepartment of Electrical Engineering National United University1 1. 2. 3. 4. 5. 6. : , , .. : , : , ( ), , ( ), ..(), For most antennas, losses are small so that the gain is nearly equal to directivity. Thus, as a practical matter, gain and directivity are often used , dipoles and slots Both loop and dipole have identical field patterns but with Eand Hinterchanged. The horizontal loop is horizontally polarized and the vertical loop is vertically polarizedpolarized. To qualify as a small loop or short dipole, the dimensions should be and slotsdipoles and slots If the dipole has been cut from a metal sheet, leaving a slot, the dipole and slot are said to be and slot are said to be complementary.

dipole and slot are said to be complementary.dipole and slot are said to be complementary. ... An array of two λ/2 dipoles in front of a ... the conical spiral and the log-periodic. The patch antennaThe patch antenna • The patch is a low-profile, low-gain, narrow-bandwidth

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  Array, Periodic, Dipoles, The log

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