Abstract
This article proposes a reconfigurable low-profile monopolar antenna with triple-band independent tuning capability. The antenna is based on the concept of a center-fed patch with shortings to achieve omnidirectional radiation patterns. Instead of using vias, varactor-loaded stubs are utilized to create reconfigurable equivalent shorting points. The triple bands can be achieved by using three sets of stubs. This configuration results in three magnetic current loops that spatially overlap at different independently tunable frequencies. Measurement results show that the design obtains three independent tunable frequencies centered at 2.51, 3.56, and 4.62 GHz with -10 dB relative tuning ranges of 22.8%, 22.8%, and 16.7%, respectively. The antenna radiates omnidirectionally with vertical polarization in the three sweeping bands. The proposed concept can be extended to a larger number of bands by adding sets of stubs with considerations of coupling and impedance matching.
Highlights
I N RECENT decades, the demand in wireless communications has risen significantly
In varactor-loaded antennas, varying the bias voltage leads to a progressive variation in the diode capacitance that can create a continuous frequency tuning. Because of this feature, adopting varactors to create frequency-reconfigurable antennas is beneficial, in particular for applications that require a large number of operating bands with continuous tunability
The design was specific for radio receivers with broadside radiation patterns and only −6 dB reflection coefficient
Summary
I N RECENT decades, the demand in wireless communications has risen significantly. This has brought upon increasing congestion of the available radio spectrum. In varactor-loaded antennas, varying the bias voltage leads to a progressive variation in the diode capacitance that can create a continuous frequency tuning Because of this feature, adopting varactors to create frequency-reconfigurable antennas is beneficial, in particular for applications that require a large number of operating bands with continuous tunability. Behdad and Sarabandi [12] demonstrated a broadside-pattern dual-band reconfigurable antenna with independent tuning of the bands This was obtained by loading varactors onto a bent slot antenna. An antenna with tri-band independent tuning capability was presented by Bai et al [25] In this case, the design was specific for radio receivers with broadside radiation patterns and only −6 dB reflection coefficient. A triple-band frequency-reconfigurable lowprofile monopolar antenna is proposed based on the concept of independent magnetic current loops sharing a common thin aperture. The concept of reconfigurability will be validated with a triple-band reconfigurable design, followed by concluding remarks
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