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The design of circular dual and quad ridged horn antennas covering the 18 to 45 GHz band is discussed. An exponential taper and blending fillet for the ridge profile are presented to minimize 3 dB beamwidth variation while maintaining high boresight gain for both dual and quad ridge horns. Boresight gain for a quad ridge design is greater than 15 dBi, while boresight gain greater than 17.9 dBi is...
An antenna system simultaneously providing a radar function and a secondary communication function with beam agility is proposed. The system is composed of a slotted waveguide (for the communication function) feeding a horn antenna (for the radar function). Direct modulation in four different directions can be obtained for communication provided each radiating slot is equipped with a simple switch.
A wideband illuminator antenna with constant effective aperture is developed for use as a calibration source for a radio telescope. Good performance is obtained over a 6:1 bandwidth.
This paper presents two novel designs of SIW H-plane horn antenna which are achieved by adding different double square loops as transition structure. The double square loop and its improvement rotated double square loop are adopted to improve the mismatch between the horn and free space. By optimizing the dimensions of the double square loop structure and rotation angle, the bandwidth performance...
The application of frequencies beyond 300 GHz in the so-called THz frequency range requires electronic beam steering, which can be realized by a phased array. In this paper, measurement results of a novel 300 GHz phased array antenna with horn elements and a targeted gain of 20.7 dBi for THz communications are presented. The results are compared to simulations with respect to antenna patterns, gain,...
A 32 GHz urban microcellular measurement campaign is presented in this paper. A path loss model in line-of-sight (LOS) for the fifth-generation (5G) candidate frequency band 31.8–33.4 GHz is provided, and different key channel metrics such as omni-directional path loss, angular and delay spreads and Rician K-factor are investigated. The investigation shows that no significant difference between the...
This paper presents a microwave planar lens formed by a multilevel frequency selective surface (FSS) aimed at increasing the gain of a radially-corrugated horn antenna. The FSS is formed by three layers of square loops with open stubs. The phase compensation is achieved by shifting the resonant frequency of the unit cell. To do so, only the length of the stubs is suitably adjusted, leaving the rest...
The following contribution presents the design of waveguide fed antennas that are directly integrable into injection molded plastic parts using 3D molded interconnect devices technology. The fabrication method used for 3D metallization of the plastic parts is Laser Direct Structuring (LDS). First a single dielectric filled waveguide fed horn antenna is developed, fabricated and characterized to verify...
This paper presents a method for the modular simulation of a Compact Antenna Test Range (CATR). The CATR simulated in this work is similar to the installed facility at the Microwaves and Radar Institute at the German Aerospace Center (DLR) in Oberpfaffenhofen and it has a dual reflector configuration. A model of this facility was created and simulated with both full-wave methods such as Method of...
This paper presents a millimeter wave channel measurement in Urban Microcell (UMi) scenario at 28 GHz with a bandwidth of 400 MHz. During measuring, a steerable horn antenna is used at receiver (RX) side while an omnidirectional antenna is used at transmitter (TX) side. The horn antenna not only rotates in azimuth with a step of 5° but also points into three different vertical angles. Based on the...
This paper presents the design and optimization of a 183 GHz profiled corrugated horn for a Microwave Humidity Sounder using Adaptive Neuro-Fuzzy Inference System (aNFIS). The theory and the process of designing antenna using ANFIS are discussed briefly. The return-loss and the radiation patterns of a horn, designed using ANFIS are compared with the results obtained using commercially available simulator...
This paper presents the comparison of power angular spectra at frequencies below and above 6 GHz, i.e., 2, 15, 28, 60 GHz. With the increased focus on millimeter wave frequencies for ultra-high data rates, a detailed understanding of channel frequency dependence has become crucial. The analysis in this paper is based on multi-frequency radio channel measurements in an indoor coffee room environment...
This paper proposes the performance comparison of two different corrugated feed horn designs and their corresponding feed chains working simultaneously in the X and Ka frequency bands. One of the solutions is composed of an X band coaxial corrugated horn that combines axial and radial corrugations fed laterally by an OMTJ formed by four branches to allow dual polarization and a smooth-walled spline-profile...
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