Abstract
A co-planar waveguide fed slot antenna element with 34% impedance bandwidth and 2-3 dBi broadside gain is proposed. The corner bent topology of the element is investigated for reduced physical footprint and easier integration with the mobile terminals operating in the 28-GHz band. The front-to-back ratio of the corner bent antenna is 1 dB in the xy plane, which indicates a high specific absorption rate. A compact wideband reflector is proposed which has transmission of less than -25 dB and a linear phase ±90° in the 27-33-GHz bandwidth. The wideband reflector is integrated with the corner bent antenna at 0.135λ offset from the radiating aperture. The corner bent antenna integrated with the reflector operates in the 27-33-GHz band, with a front-to-back ratio of more than 14 dB across the band and a forward gain of 6-7.2 dBi. The radiation patterns are stable for 20% bandwidth. The simulated and measured results are presented.
Highlights
Due to massive explosion in bandwidth hungry applications of cellular telephony, the hardware architecture for the future 5G communication system needs to support the proposed mmWave bands [1]
Various configurations of antennas for 5G mobile terminals have been investigated such as [7] which has multilayered design, occupying relatively larger area, with a 9% impedance bandwidth
Even though the antenna element proposed in [8] has a 10% bandwidth the radiation patterns might not be suitable for integration with the mobile terminal
Summary
Due to massive explosion in bandwidth hungry applications of cellular telephony, the hardware architecture for the future 5G communication system needs to support the proposed mmWave bands [1]. The desired characteristics of a 5G mobile terminal antenna include conformal structure, low physical footprint, high impedance bandwidth to support future spectrum at 28 GHz, stable patterns over the entire band with low specific absorption rate, high gain for the available aperture on the terminal and pattern diversity to support functionalities in multi-orientation [6]. Karthikeya et al.: CPW Fed Wideband Corner Bent Antenna for 5G Mobile Terminals. The CPW-fed mmWave antenna demonstrated in [17] has an operating frequency at 30 GHz, the bandwidth is low (less than 5%) and it uses an air-bridge in the feedline for impedance match. The proposed antenna has low physical footprint and stable patterns in the 27 to 33 GHz band with a forward gain of 6-7 dBi. Detailed designs, simulation and measurement results are presented. It is observed that the circular slot is uniformly illuminated irrespective of the frequency, a wide impedance bandwidth is achieved
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