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This paper presents a slotted-rectangular patch antenna with proximity-coupled feed operated at dual band of millimeter-wave (mmV) frequencies, 28GHz and 38GHz. The antenna was built in multilayer substrate construct by 10-layers Low temperature Co-fiber Ceramic (LTCC) with 5 mils thickness each. The slotted-patch and thick substrate are configured to enhance the bandwidth and obtain a good result...
This paper presents the results of the antenna pattern measurements conducted on the Ice Cloud Imager 664 GHz feed horn at the ESTEC Sub-mmwave Scanner (SmS) in support to the ICI instrument of the MetOp-SG program. Very good agreement between simulations and measurements was obtained, both in the co- and cross-polar component. The measured peak directivity was 26.28 dBi ± 0.13 dB while the simulated...
We report the intermediate results on a novel slotted waveguide antenna for point-to-point communications at Ka band. The antenna adopts an aperiodic layout with uniformly-excited elements capable of meeting the ETSI class II radiation pattern envelop in all planes with high aperture efficiency. A total of 16 regular waveguide subarrays with an aperiodic inter-column spacing along the E-plane are...
This paper presents the results of the antenna pattern measurements conducted on the Ice Cloud Imager 664 GHz feed horn at the ESTEC Sub-mmwave Scanner (SmS) in support to the ICI instrument of the MetOp-SG program. Very good agreement between simulations and measurements was obtained, both in the co- and cross-polar component. The measured peak directivity was 26.28 dBi ± 0.13 dB while the simulated...
In order to improve the gain of the array antenna element in the W-band and reduce its horizontal dimension, The directional radiation antenna loading dielectric sheet based on SIW technology is proposed. The antenna uses a conventional micro strip line to feed the gradient open micro strip line. Then the gradient open micros trip line feeds the SIW. Finally, the dielectric sheet loaded in SIW will...
In order to reduce the minimum antenna measurement distance, the aperture reduction is needed. While the aperture reduction will cause the gain of the antenna reduced. The method of loading the elongated dielectric rod on the rectangular waveguide can remarkably improve the gain of the antenna without increasing the antenna aperture. A simulation study was carried out on the antenna with a dielectric...
This paper proposes novel reflectarray elements by arranging double omega-shaped resonant strips with mirror image for converting a linearly polarized incident wave into a circularly polarized radiated wave. As a design example, a linear-to-circular polarizer reflectarray is presented and also its polarization property of far-field patterns over 12–17 GHz is discussed numerically and experimentally.
Authors have proposed a printed inverted-F antenna (PIFA) for circular polarization. In this paper, an approach to improve the bandwidth is investigated. It is shown that the bandwidth can be widened by designing the rectangular element loaded at the feeding line as short as possible. The redesigned PIFA in this paper has approximately twice (210MHz) the bandwidth of the 3dB-axial ratio with a 10dB-return...
Development of a 1-U CubeSat communication system is presented in this paper. GMSK modulated data from the satellite is transmitted to the ground station via a UHF channel. The uplink of the FSK modulated command from ground to the satellite is carried out via a VHF channel. As Tx and Rx antennas aboard KNACKSAT-the CubeSat to be created in this project, half wavelength dipoles were chosen. The developed...
For covering a specified wide circular area with a tilted sectoral beam, this paper proposes compact beam-tilted multimode horns based on coaxial dual-path guides and shaped dielectric-lens onto the horn aperture. We present two design examples with a beam tilted up to 20 degrees for 24 GHz radio-sensor systems. One is constructed with an axially symmetrical structure and also is fed by a bend waveguide,...
This paper presents an architecture of transmitarray antenna consisting of waveguide-type elements. The array has a planar surface profile facing the beam directions of radiation, and has a convex surface profile facing to the feeds of illumination. The concave surface is analogous to the curve of Rotman lens for the applications of multi-beam radiation. The additional phases required in the concept...
This paper presents a circularly polarized reflectarray with linearly polarized feed operating at 28GHz for 5G applications. The proposed reflectarray is composed of a flat reflecting surface populated with numerous two-layer ground-backed non-resonant subwavelength rectangular patch elements which are in staggered arrangement and a Vivaldi antenna as the linearly feeder. Simulated results demonstrated...
A Cuboid Dielectric Resonator Antenna fed by microstrip feed line is studied. The dielectric resonator of the antenna is made by a material with high dielectric constant ∊r=30. The impedance matching of dielectric resonator can be improved by using a # slot in the ground. In additional, a two elements array is used to enhance the performance of the antenna. This proposed antenna is suitable for long-term...
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