Development of dual band miniaturized slot antenna with 2-stage bandpass filter

This paper presented the development of a miniaturized slot antenna, and its length is smaller than quarter wavelength, with a coplanar transmission line-based matching circuit on a printed circuit board. The matching circuit is realized by applying 2-stage band-pass filter (BPF). Moreover, we realized a dual band frequency characteristic in order to separate the uplink and downlink, which is suitable for a frequency division duplex (FDD) application. Our proposed dual band antenna is designed and simulated by using commercial three-dimensional electro magnetic (EM) field simulator. Also, we fabricated this dual band antenna on FR4 substrate and measured the frequency characteristics.