In this letter, a dual-frequency dual-polarization slotted waveguide antenna array at Ka-band is proposed. A 9 ×10 inclined slot array working at 35 GHz, cut in the narrow wall of rectangular waveguides, is employed for horizontal polarization (HP). An 8 ×10 longitudinal slot array working at 30 GHz, etched on the broadside of ridged waveguides, is employed for vertical polarization (VP). The two arrays are interlaced with each other and fed from the opposite sides. Two novel bend interconnected structures are invented to connect the radiating waveguides and feeding networks, which simplify and compact the antenna structure and improve the aperture efficiency. The measured -10-dB reflection coefficient bandwidth of HP array is 688 MHz, and 658 MHz for VP array. The maximum gain is 25.4 and 24.8 dB for HP array and VP array, which correspond to the aperture efficiency of 36.3% and 43.05%, respectively. The sidelobe levels of both arrays are below -17.6 dB.

Design and Implementation of Dual-Frequency Dual-Polarization Slotted Waveguide Antenna Array for Ka-Band Application

A high gain, multi-beam lens antenna system for future fifth generation (5G) wireless networks. The lens antenna includes a spherical dielectric lens fed with a plurality of radiating antenna elements. The elements are arranged around the exterior surface of the lens at a fixed offset with a predetermined angular displacement between each element. The number of beams and crossover levels between adjacent beams are determined by the dielectric properties and electrical size of the lens. The spherical nature of the dielectric lens provides a focal surface allowing the elements to be rotated around the lens with no degradation in performance. The antenna system supports wideband and multiband operation with multiple polarizations making it ideal for future 5G wireless networks.

High gain, multi-beam antenna for 5G wireless communications

Seeker is widely used in literature of radar. The goal of this paper is designing a dual mode monopulse antenna for seeker. The dual mode technology is widely used in passive and active seekers. In this technology, antenna radiation and infrared sensor are used for target detection. Thus, the angle of target in azimuth plane is precisely detected. In this paper, a dual mode slot array antenna in X-band for an active seeker is designed and optimized. The Main lobe of the antenna is only in azimuth plane and does not shift with frequency variation. The gain of the antenna is suggested to be 23dBi for the best detection. We select the type of the antenna due to the available results in the literature. Then, designing of the antenna is done step by step. Simulation and optimization of antenna are performed by CST studio suite software.

Modeling, design and optimization of dual mode circular planar monopulse slot array antenna in X-band

An improved dual‐band shared aperture waveguide slot array antenna

In this paper, an improved wideband multilayer dual-polarized antenna fed by stripline coupling slots is proposed at Ku-band. The horizontal polarization(HP) of the antenna is realized by the coupling of driven patch to the parasitic patch. The vertical polarization(VP) is excited by H-shape slots on both sides ground of stripline, which is in turn coupled by a stripline feeder. Some metallized vias are used to achieve good impedance matching between H-shaped slots and stripline feeder. Simulation results show that the actual operating bandwidth of the antenna two polarizations can be greater than 4GHZ.

An Improved Broadband Multi-layer Dual-polarized Antenna for UAV Radars

A dual polarized waveguide slotted array for Ka band application is designed Vertical polarization (VP) is realized by longitudinal slots on broad wall of the ridge waveguide sub array, while horizontal polarization (HP) is realized by tilted slot pairs in the narrow wall of the rectangular waveguide sub array The feed networks are also designed for each polarization Especially that for VP, a method to improve the coupling is presented The antenna has low cross-polarization level and high degree of isolation between two ports

Design of dual-polarized waveguide slotted antenna array for Ka-band application

A novel wideband aperture-coupled patch antenna is presented in this paper The antenna has a cavity of dielectric backed configuration, which can avoid the back radiation of the aperture and suppress the excitation and propagation of a parallel plate mode between the up and below ground plane The antenna is fed by an inhomogeneous stripline, which is convenient for the vertical connection between the feed-line and the coax probe The cavity with reasonable size contributes to excite the mutual resonance between the aperture and patch, which afford a broadband solution The simulated results show the 10dB-bandwidth exceeds 40%, and the cross-polarization of E plane and H plane are all lower than −40dB Furthermore, the antenna has a simple configuration, and is benefit for being integrated with other RF and control devices through via holes

A wideband aperture-coupled microstrip patch antenna with backed cavity of dielectric

A novel type of monopulse circular polarization radial waveguide slot array antenna (RWSA) at W wave band with good stability, small volume and low manufacturing difficulty is designed in this paper The antenna consists of radial waveguide slot array planar antenna, rectangular-to-radial waveguide transformer and planar sum-difference network The properties of the antenna are realized by using genetic algorithm and available electromagnetic simulation software HFSS

Monopulse circular polarization radial waveguide slot array antenna at W wave band

A homogeneous dielectric spherical lens circular polarization multi-beam antenna working at millimeter-wave band is simulated To achieve a compact, firm structure and ease of assemblage, the antenna lens and feeds are leaned against each other The single-feed lens with different permittivity and radius is simulated The material and radius of the lens is selected based on the foregoing simulating the tolerance between gain, sidelobe and crossover of far-field pattern The simulation results demonstrate that the radiation patterns meet the basic requirements for the multi-beam antennas

A study on circular polarization multi-beam antenna at Ka band

An ellipsoid of revolution is an important focusing element. By matching the complex phase, the formulas are deduced for reflection of Gaussian beams at the surface of an ellipsoid of revolution in this paper. The analysis is extended to an arbitrary angle of incidence, and the derived results are transformed into ABCD ray matrices. By making use of these matrices, we can handily design and estimate some special quasioptical systems, including such elements as cylindrical or ellipsoidal shapes.

Reflection of Gaussian beams at the surface of an ellipsoid of revolution

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