Design of Sleeve Dipole Antenna for Suppressing Leakage Current on a Coaxial Cable

• Published in: IEEE antennas and wireless propagation letters Vol. 13; pp. 459 - 462
• Main Authors: Jung, Seo-Cheol, Jung, Tae-Hwan, Woo, Jong-Myung
• Format: Journal Article
• Language: English
• Published: New York IEEE 2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antennas; Cable TV; Coaxial cables; Conductors; Conductors (devices); Current measurement; Dipole antennas; Helical shape; Leakage current; Leakage currents; Microwave antennas; Microwave imaging; miniaturization; Noise levels; portable breast cancer detection system; Retarding; sleeve dipole antennas; Sleeves
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2014.2309655

A small sleeve dipole antenna (SDA) for a suppressing leakage current on a coaxial cable is presented in this letter. The upper radiating element of the proposed antenna is modified into a helical shape to reduce the antenna size. For good impedance matching performance, a coaxial-type short stub is inserted inside the sleeve. Leakage current on the outer conductor of a coaxial cable due to miniaturization and the sleeve structure is suppressed by using an L-shaped open stub inside the sleeve. The designed small SDA is miniaturized by up to 34.8% compared to a normal SDA. Input impedance is matched below S11 of -20 dB at 1.5 GHz, and the measured -10-dB bandwidth is 70 MHz (4.6%). The average leakage current on the outer conductor of the coaxial cable is 5.1 dB lower than a normal.