Abstract
Currently, several microwave filter designs contend for use in wireless communications. Among various microstrip filter designs, the reconfigurable planar filter presents more advantages and better prospects for communication applications, being compact in size, light-weight and cost-effective. Tuneable microwave filters can reduce the number of switches between electronic components. This paper presents a review of recent reconfigurable microwave filter designs, specifically on current advances in tuneable filters that involve high-quality factor resonator filters to control frequency, bandwidth and selectivity. The most important materials required for this field are also highlighted and surveyed. In addition, the main references for several types of tuneable microstrip filters are reported, especially related to new design technologies. Topics surveyed include microwave and millimetre wave designs for 4G and 5G applications, which use varactors and MEMSs technologies.
Highlights
Reconfigurable microwave filters are vital in wireless communications
Microwave filters can be categorized in terms of the position of the poles and their effect on the insertion loss and the effect of the zeros on the characteristics of the passband
Firstly,reconfigurable a discussion introduces survey compare surface acoustic wavereconfigurable (SAW), bulk using varactor diodes integrated with microelectromechanical system (MEMS) technologies and filters using varactor integrated microelectromechanical system (MEMS)
Summary
Reconfigurable microwave filters are vital in wireless communications. Many applications require diversity in filter performance. By using the independent electric and magnetic mutual coupling technique, designs can cover a wide tuning range of 845–1500 MHz. In addition, by utilizing the concept of the λ/2 resonator, Zhang et al presented a second-order reconfigurable microstrip bandpass and band-stop filters by using varactor diodes [9] and [22], respectively. By utilizing the concept of the λ/2 resonator, Zhang et al presented a second-order reconfigurable microstrip bandpass and band-stop filters by using varactor diodes [9] and [22], respectively In these designs, a constant absolute bandwidth had been achieved by utilizing a mixed electric and magnetic mutual coupling technique.
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