Application Of Left-handed Materials In RF And Microwave Devices

The left-handed material(LHM) is a kind of periodic metamaterial with negative permittivity and permeability simultaneously. It can improve device performance obviously because of its unique double-negative property in RF and microwave devices application. Thus, it becomes one of the hot research in the current international field of physics and electromagnetism field.Firstly, a left-handed material structure based on split-ring resonator(SRR) is presented for 60 GHz communication application in this paper. The left-handed properties(double-negative) are validated by S parameter inversion method(NRW).Then, a small size U-band filter structure based on composite right/left handed transmission line(CRLH TL) is proposed. The size of the proposed filter is 1.428mm*0.5530 mm and the 3dB bandwidth is from 48.5GHz to 59.3GHz. The filter has the low return loss, flat insertion loss and flat group delay.Finally, a microwave oscillator working in 2.45 GHz based on the principle of zero order resonator is proposed in this paper. The proposed oscillator has stable output wave form and low phase noise. The 1st harmonic frequency is at 2.45 GHz with 7.87 dBm power. The 2rd harmonic frequency is at 4.9GHz with-15.68 dBm power. It states that the proposed oscillator has excellent harmonic suppression and high output power.The simulation results demonstrate that LHM has the advantages of small size, low loss, low cost, easy fabrication and wide band compared with the traditional materials, which indicates that the Left-handed material will have a good application prospect in the modern radar and wireless communication system.