Abstract
A wideband vertically-polarized end-fire magneto-electric (ME) dipole antenna fed by an asymmetrical substrate integrated coaxial line (ASICL) is proposed for millimeter-wave (mm-wave) applications. The proposed ME dipole antenna has an impedance bandwidth of 60% and produces an end-fire radiation with a stable gain between 5.8 and 6.9 dBi in simulation. To verify the design concept and its application in arrays, a $1 \times 8$ linear array with a fixed beam and a $1 \times 4$ linear array with multiple beams are designed, fabricated and measured. The fabricated fixed-beam array prototype exhibits an impedance bandwidth of 62%, a peak gain of 15.9 dBi and a radiation efficiency of 79%. The multi-beam array is fed by a $4 \times 4$ ASICL Butler matrix. Experimentally, excellent beam-scanning radiation patterns with reasonably low side lobes and low cross polarizations are demonstrated at 24, 30 and 36 GHz. And an overlapped operating bandwidth of 28.6% is achieved by the fabricated prototype.
Highlights
M ILLIMETER wave technology is one of the most important parts of the emerging fifth generation (5G) wireless communications
Since the electromagnetic (EM) waves of mm-wave frequencies suffer from high propagation losses, high-gain antennas are usually required for mm-wave systems
ASYMMETRIC SUBSTRATE INTEGRATED COAXIAL LINE An asymmetric substrate integrated coaxial line (ASICL), which was firstly used by the authors in [25], is used as the feed line for the proposed antenna
Summary
M ILLIMETER wave (mm-wave) technology is one of the most important parts of the emerging fifth generation (5G) wireless communications. By adopting the concept of magneto-electric (ME) dipole antenna, two end-fire SIW-fed antennas with vertical [26] and horizontal [27] polarizations respectively were reported These two ME dipole antennas exhibited impedance bandwidths over 40%, but the multi-beam array designs were demonstrated with bandwidths narrowed to 20% due to employing the SIW feed networks. Each element was a broadside-type antenna and the whole array design had a 3D structure Another wideband end-fire ME dipole antenna was proposed and a 1 × 4 fixed-beam array was examined with an impedance bandwidth of 60.6% [30]. This antenna was fed by an MSL and the radiation was horizontally polarized.
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