T‐shaped compact mobile handset antenna for wideband applications

Abstract

CDA. In the range of 1.2-2.1 GHz, PAE of UBDA is over 20% and output power is up to 20 dBm. The improvement in output power becomes significant when the operating frequency increases. At 2.6 GHz, the output power of UBDA is 15.7 dBm which is 3.7-dB higher than that of the CDA. As shown in Figure 5, maximum PAE improvement occurs at 1.8 GHz at which the UBDA shows a 16.8% increase in PAE over the CDA. Figure 5 also shows that when the input power is smaller than 4 dBm, even the output power of the UBDA is similar to that of the CDA, satisfactory improvement in PAE can still be observed, and the saturation power is increased which provide a significant PAE improvement. CONCLUSIONAn unequal bias distributed power amplifier using discrete components has been presented. Experimental results show that the proposed UBDA provides a gain of 13.8 dB at 1.8 GHz with the operation frequency band from 0.8 to 2.6 GHz. It has also been shown that, by using the unequal bias technique, dummy load at the output ATL is eliminated with significant improvement in PAE and higher output power can be achieved through-out the operating frequency band. At the operating frequency of 1.8 GHz, a maximum improvement in PAE can be observed, which is three times higher than that of the optimized conventional DA.