Planar Monopole Antenna with a Parasitic Shorted Strip for Multistandard Handheld Terminals

Abstract

A planar monopole antenna with a parasitic shorted strip for multistandard handheld terminal is presented. The proposed antenna simply consists of two overlapping strips: a long strip on the front side and a parasitic shorted strip on the back side. To make the proposed antenna easy to manufacture and reduce the manufacturing cost, the entire structure is fully printed without VIA holes, the long strip monopole is directly fed, and the parasitic shorted strip is coupled-fed by the overlapped part. For lower and middle frequencies, the GSM900 and PCS bands are excited by the fundamental mode of the long strip and the parasitic shorted strip, respectively. For the upper frequency, the Wi-Fi2400/RFID2450 and LTE2300/2500 bands are provided by the third-order mode of the long strip. The detailed design of the proposed antenna and its radiation performances are studied. The proposed multiband antenna occupies a small area of 40 × 18 mm2 on a printed circuit board (PCB). The measured results show that the proposed antenna has three impedance bands with return loss less than-6 dB: 25.6% for the low band (850-1100 MHz), 13.3% for the middle band (1750-2000 MHz) and 22.7% for the high band (2190-2750 MHz).