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Abstract
A co-designed (3+3)-port antenna for dual-band operation that requires no feeding or decoupling network is proposed and verified. The antenna consists of six ports which are divided into two groups that resonate in two different frequency ranges. The basic radiating element is a tri-modal patch in a folded snowflake-shaped structure with the largest antenna dimension of 0.48λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> or 0.68λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> and λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> are the wavelengths in air at the center frequencies of the lower and upper operating bands, respectively. Measurement results show that the 10 dB impedance bandwidths of the two respective bands are 19.7% and 14.4%. The proposed antenna exhibits compact, multiport, multiband and broadside radiation characteristics which are not only suitable for dual-band MIMO applications, but also for energy harvesting systems with spatial and frequency diversities, or dual-function wireless systems with simultaneous information and power transfer.
Highlights
Y (UHF)/ultra-wideband (UWB) radio-frequency identification (RFID) reader antenna [1]
The number of available antenna ports can be regarded as another dimension in ambient radio frequency (RF) energy harvesting (EH) systems to collect more RF
In addition to ambient RF EH, the system can be used for information transfer (IT) and even localization, if a modulator/demodulator is embedded
Summary
N RECENT wireless communications research there is a growing trend to reuse a common radiating area for providing multiple antenna ports with different operating frequency bands. This is different from a conventional multiband antenna which typically only consists of a single port. In the context of creating multiports for both multiband and MIMO operations, the wideband broadside tri-modal patch antenna in [24] has undergone a further evolution, such that a single compact radiating element can be shared by two tri-port antennas working in two different frequency bands.
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