Design of a Dual-Band Loop-Type Ground Antenna Using Lumped-Elements

Abstract This paper presents a dual band loop-type ground antenna using lumped-elements that control the impedance band-width and resonant frequency. The dual-band operation of the proposed antenna is realized by inserting an additional resonated loop feed structure into the reference ground antenna. As the proper value of the capacitor and the inductor are chosen, the impedance bandwidth of our antenna with voltage standing wave ratio(VSWR) equal to 3 is 85 MHz and 725 MHz at the 2.45 and 5.5 GHz frequency band, respectively. Its validity is demonstrated via both the computed and measured results. Good antenna patterns and efficiencies are achieved at the dual frequency bands, as well as the physically small antenna element size(10×5 mm 2 ). Key words: Dual-Band Antenna, Lumped-Elements, Controlling Impedance, And Resonance Frequency Ⅰ . 서 론 최근스마트폰시장활성화에따라, 스마트폰을이용한무선통신서비스사용량또한급격히증가하는추세이다. 각종방송매체에서무선통신서비스사용량증가에따른여러문제들을보도할만큼관심이집중되고있으며, 다수의통신사업체또한이에관한문제해결에많은노력을기울이고있다. 향후4세대이동통신시대에도스마트폰사용량은계속증가할전망이며, Wi-Fi 또한그사용자가줄지않고증가할전망이다. 이에따라스마트폰통신에사용되는Wi-Fi 대역의효율적인사용방안에대한많은연구가진행되고있다