Summary
International Symposium on Antennas and Propagation
2009
Session Number:2C4
Session:
Number:2C4-5
Band-notched UWB Printed Log-Periodic Dipole Antenna Fed by Half Mode Substrate Integrated Waveguide
Chao Yu, Wei Hong, Chen Yu, Zhen Qi Kuai, Wei Qin,
pp.496-499
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Ultra-wideband (UWB) systems approved by U.S. Federal Communications Commission (FCC) [1] utilize spectrum resource ranging from 3.1 to 10.6 GHz, a valuable bandwidth for highspeed indoor data-communication application. As a key component of UWB systems, UWB antenna has drawn more and more attention worldwide to be designed for the purpose of transmitting very short and low power pulses. However, interferences from other narrowband communication systems will be inevitably introduced into UWB systems. For instance, Wireless Local Area Network (WLAN), operated at the bands of 2400-2484MHz, 5150-5350MHz, 5725- 5825MHz, will cause interferences in UWB frequency band. Therefore, it is necessary to design antennas with band notched function in specified frequency bands. Recently, various band-notched antennas have been proposed for UWB communication systems [2]-[4]. Directional antenna can gain a great concentration of radiated power in a specified direction and is necessary for UWB application, but only a few researches have focused on such category of antennas. Printed log-periodic dipole antenna (PLPDA) [5][6] has sparked a great deal of research interest and is becoming an attractive candidate in this area, due to its elegant merits, such as low profile, light weight, low cost, and easy integration. However, the feeding system of PLPDA needs to be further developed. It is too complex and costly to use stripline as feeding system on the grounds that stripline is of a two layer structure [7], while using coaxial cable will result in strict requirements on structure in high frequency band [6]. In present study, a band-notched UWB printed log-periodic dipole antenna fed by half mode substrate integrated waveguide (HMSIW) is proposed. The natural balance structure of HMSIW [8]-[10] makes it suitable for the feeding system of PLPDA. Moreover, this property is independent of frequency in a wide bandwidth. HMSIW inherently cannot support the TE(2m)n modes and TM modes, and it will gain a broad dominant mode bandwidth. This antenna was fabricated with a standard printed circuit board (PCB) process. The measured results of the proposed antenna are consistent with simulated results, obtained by using Ansoft High Frequency Structure Simulator (HFSS) 11.0.