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In this work, 2‐element slot‐based frequency reconfigurable (FR) multiple‐input‐multiple‐output (MIMO) antenna design antenna with a very wide‐sweep is proposed for dynamic spectrum sharing (DSS) in 5G technologies. FR is achieved using varactor diode with frequency tuning range from 1655 to 2605 MHz. The design is a low profile with planar structure having a single element footprint of 19.5 × 20 mm2. The two slot antenna elements of the MIMO configuration are etched out from a ground (GND) plane of dimensions of 60 × 120 mm2. The proposed antenna is narrow‐band and hence it is suitable for RF front‐end in the 5G‐enabled DSS in cognitive radio (CR) applications. [ABSTRACT FROM AUTHOR]

This article presents a compact reconfigurable filter performing bandwidth reconfiguration covering the entire L‐band frequency range. The reconfigurable filter is developed using a C‐shaped resonator coupled to the source and load through varactor diodes. To reverse bias the diodes symmetrically both the diodes are fed with a common bias voltage. Hence the DC bias voltage is administered evenly to the diodes resulting is equi‐proportional coupling between the resonator and the nodes. This results in reconfiguring the bandwidth of the operating frequency. The designed filter is capable of tuning 3‐dB bandwidth from 0.613 to 1.353 GHz with the center frequency as 1.5 GHz. The percentage bandwidth of the filter is varied from 44.5% to 91.76%. The insertion loss offered by the filter is very less with the minimum value of 0.42 dB. The proposed filter is simple, compact and finds it application in power agile systems operating with different transmission power levels at different time instances. [ABSTRACT FROM AUTHOR]

In this letter, a four‐pole balanced frequency‐agile bandpass filter (BAL‐FA‐BPF) with constant absolute bandwidth (CABW) and four transmission zeros (TZs) is reported. This design is based on the advanced coupling matrix technique which ensures the realization of CABW for the filter. The fully‐canonical coupling topology with cross‐coupling and source‐load coupling is adopted, which introduces four TZs for the differential‐mode passband. The tunable half‐wavelength resonators are used and loaded by resistors, which effectively enhances the common‐mode (CM) suppression. The demonstrative BAL‐FA‐BPF has a frequency tuning range of 1.92‐2.97 GHz (42.9%) and keeps the absolute bandwidth within 167 ± 3.7 MHz (2.2%) over entire the FTR. CM suppression is better than 40 dB. [ABSTRACT FROM AUTHOR]

ABSTRACT In this work, a novel multiband, four-element, meandered-line reconfigurable planar F-shaped multiple-input-multiple-output antenna is presented. The proposed design includes chassis mode reconfigurability option as well. A combination of PIN and varactor diodes is used to achieve the frequency tuning over a wide-band. The proposed design covers several well-known frequency bands between 0.7 and 3 GHz. The design is compact and realized on a single commercial substrate board with dimensions 65 × 120 × 1.56 mm3 that can be used in small wireless handheld devices for cognitive radio applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1933-1938, 2015 [ABSTRACT FROM AUTHOR]