Abstract
In this paper, a magneto-electric (ME) dipole antenna excited by two slots through a printed ridge gap waveguide (PRGW) is presented. This antenna, which operates in the Ka-band, is considered as a dual complementary source (DCS), and exhibits a higher gain and a wider impedance bandwidth, compared to conventional ME dipoles. The proposed antenna has an impedance matching bandwidth with |S 11 | <; -10 dB from 24.5 to 40 GHz with a stable gain of 10±1 dBi over the 25-35 GHz band. Moreover, by integrating horizontally three layers, each with an array of 4 × 10 split-ring resonator (SRR) unit cells on top of the DCS-ME dipole antenna, the realized gain is increased while maintaining the impedance bandwidth of the antenna. The antenna was fabricated and measured to confirm the simulation results. The fabricated prototype has a size of 1.1 × 1 × 0.58 λ 3 (at 30 GHz) and exhibits a measured impedance bandwidth in excess of 50%, from 24 to 40 GHz, a maximum measured gain of 14.2 dBi at 35 GHz, and a measured radiation efficiency of 93% at 30 GHz.
Highlights
Millimeter-wave frequencies have attracted worldwide attention due to the demand for wide operating bandwidths (BW), necessary for fifth generation (5G) mobile communications. 5G will bring mobility to mm-wave communications as the generation wireless network
The split-ring resonator (SRR) layers are held on top of the antenna by inserting them inside rectangular cuts which are etched on two vertical walls on two sides of the dual complementary source (DCS)-ME antenna
The third layer of the dual complimentary source magneto-electric (DCS-ME) dipole consists of a 50- microstrip line on the bottom and a ground plane on the top plate, which were lengthened by 5 mm to support the coaxial 2.92-mm end-launch connector
Summary
Millimeter-wave (mm-wave) frequencies have attracted worldwide attention due to the demand for wide operating bandwidths (BW), necessary for fifth generation (5G) mobile communications. 5G will bring mobility to mm-wave communications as the generation wireless network. The SRR layers act as a mu-near zero (MNZ) medium and improve the realized peak gain up to 14.2 dBi at 35 GHz, without affecting the reflection coefficient of the antenna and with a SLL less than −12 dB in the H-plane over the whole frequency band. (a) 3-D view of the proposed dual complementary source magneto-electric (DCS-ME) dipole antenna loaded with three SRR layers, and (b) geometry of feed network below the slots (dimensions are in wavelengths (λ) at 30 GHz). This can be applied here in a dual manner, by loading an MNZ medium in front of the ME dipole antenna, increasing the gain due to the small phase shift on the antenna aperture This can be explained by calculating the phase of the total transmission coefficient in terms of (d/λ) with a low permeability when the TE waves emanate from the antenna source through the SRR layers.
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