Title :
Wideband active small antenna design using the dummy antenna for T-DMB system
Author :
Kim, D.Z. ; Oh, K.S. ; Lee, M.Q. ; Min, S.B. ; Yu, J.W.
Author_Institution :
Korea Adv. Inst. of Sci. & Technol., Daejeon
Abstract :
The frequency band for T-DMB (terrestrial digital multimedia broadcasting) system in Korea is assigned to the VHF channel 7~13 (174 MHz~216 MHz) and channel 8 and channel 12 are used in Seoul. The length of the lambda/4 monopole with an infinite ground is about 38 cm to make a resonance at 200 MHz. Generally, meander line, high dielectric constant material and parasitic elements have been used to reduce the large size of a T-DMB antenna. But, as the effective size of an antenna is reduced, the bandwidth is getting narrower. So, these passive small antennas can not cover the wideband of T-DMB. In this work, the wideband active small antenna is proposed. We integrated the lambda/32 (4.75 cm) short monopole with LNA (low noise amplifier) for the mobile application. To obtain the wideband characteristic, we used the dummy antenna, which is the 2-port equivalent circuit of real antenna.
Keywords :
VHF antennas; broadband antennas; broadcasting; low noise amplifiers; mobile radio; monopole antennas; multimedia communication; Korea; LNA; Seoul; T-DMB antenna; T-DMB system; dummy antenna; frequency 174 MHz to 216 MHz; frequency 200 MHz; monopole antenna; size 38 cm; size 4.75 cm; wideband active small antenna design; Bandwidth; Broadband amplifiers; Broadband antennas; Dielectric materials; Digital multimedia broadcasting; Equivalent circuits; Frequency; High-K gate dielectrics; Low-noise amplifiers; Resonance;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-0877-1
Electronic_ISBN :
978-1-4244-0878-8
DOI :
10.1109/APS.2007.4396544
