Meander antenna with backside tuning stubs

In this paper, we discuss a kind of meander antenna which is designed for digital audio broadcasting (DAB) reception in BAND-III upper band (210-240 MHz). Three resonators in addition to a driven element were constructed on the topside of a printed circuit board. On the backside of it, several coupling stubs were introduced to tune resonant frequencies to the required pass-band. Resonators with different lengths are resonated at different frequencies and these multiple resonances are responsible for an enhancement in bandwidth. With the help of backside coupling, it is easy to tune multiple frequencies to the required pass-band. It is also found that current density of the associated elements is increased by backside coupling. According to experimental results, the designed antenna reaches a bandwidth around 13.3% (return loss >10 dB) in the range of 210-240 MHz.