Microwave band-pass filter in frequency reconfiguration with super substrate on cross-coupled line structure for LTE 2500, WiMAX and 5G based internet of things applications

Abstract

In this paper, the conceptualization of frequency reconfigurable microwave band-pass filter with a super substrate in odd-even method, for Internet of Things (IoT) applications is explained. The prototype consists of band pass filter in cross-coupled line structure with a symmetric structure on dielectric substrate and rectangular slot joining the cross coupled lines. A two different types of super substrate are placed in the rectangular slot one after the other. In parallel to the process, another two different types of dielectric substrate (FR4 epoxy, Rogers RT/duroid 6010 LM (tm)) are placed one after the other above the proposed system producing a total of 6 combinations, each capitulate unique impedance parameters in the transmission poles and transmission zeros. The dimensional framework of the developed design structure have FR4 epoxy (εr = 4.4 and tan δ = 0.02) substrate with 1.6 mm thickness. In the first case, FR4 epoxy substrate is used to place in the rectangular slot in addition the same substrate is placed on top of the prototype. In the second case, slot is covered with Rogers RT/duroid 6010 LM (tm) (εr = 2.2 and tan δ = 0.0009) substrate and the same substrate is placed on the top. When the higher dielectric constant material is used as the addition of substrate the output range of the bandwidths are increased. In all the two cases, the proposed system demonstrates the ability to reconfigure the operating frequencies and bandwidth shifts from LTE 2500 (2496-2690 MHz), WiMAX (2500-2700 MHz, 3400-3600 MHz) to 5 G (3200- 3670 MHz).