소방무선대역을 포함한 인빌딩용 이동통신 중계기 안테나 설계

Abstract

Communications infrastructure being built for a variety of mobile comm- unication services such as MIMO, Wi-Fi, 4G, etc. However, inside buildings or offshore plant structure have problems of propagation blind region. In addition, propagation environment of fire safety of fire-fighting also have same problem. Especially high-rise buildings should be supported within the fire-fighting radio services in recent years. So, In this thesis, proposed in-building repeating antenna included fire-fighting wireless frequency band design.

In Chapter 1, research background and necessity were presented. Why designed integrated In-building repeater antennas included fire-fighting band. Antenna used for the repeater.

In Chapter 2, multi-band antenna by multipole were presented. Antenna were designed biconial upon dipole to reduce size. To realize multiband resonant characteristic, same size dipoles are considered. Designed antenna have resonance fire-fighting band, repeater band and Wi-Fi band. Mea surement results of proposed antenna has a good agreement.

In Chapter 3, monopole antenna have directional radiation pattern were presented. The important parameters such as distance between parasitic element and a center monopole, and each height of a center monopole and 4 parasitic elements are simulated to obtain good antenna characteristics at multiband resonance. Measurement results of reflection coefficients, bandwidth, 2-D radiation pattern and gain are agreed well with their Simulation results.

In Chapter 4, cross-discone antenna were presented. discone antenna were tried to obtain a broadband frequency. The conclusion of this thesis was summarized in chapter 5.