DefinePK

Abstract

A new class of compact circular microstrip antenna with harmonic suppression for 2.45GHz is proposed. The purpose of harmonic suppression antenna is to eliminate additional insertion loss of filter used in rectenna circuit. This compact circular patch antenna has an advantage of excellent higher harmonic suppression. This characteristic is achieved by suitable introducing stub at the transmission feed line to suppress spurious radiation exhibit near third order effectively. Then, rejection characteristics have been improved using defective ground structure and slit. It is found that, the harmonic rejection technique applied improved the return loss level to -43.65dB at desired frequency with bandwidth around 122MHz. In addition, the antenna structure provides simple design with harmonic suppression capability. The single element of antenna harmonic suppression is design on FR4 substrate with relative permittivity, Er =4.7 and a thickness of 1.6mm offers a moderate gain 2.61dB and suppress the second and third harmonic up to -3dB. Thus, the proposed antenna harmonic suppression is recommended to be applied in rectenna and active integrated antenna applications, so that gives size reduction, inexpensive and efficient.