Kyung-Jin Jeon

Bio: Kyung-Jin Jeon is an academic researcher from Korea Aerospace University. The author has contributed to research in topics: Side lobe & Antenna (radio). The author has an hindex of 1, co-authored 1 publications receiving 22 citations.

X-band isoflux pattern antenna for SAR data transmission

Abstract: In this paper, a design scheme for isoflux pattern antenna suitable for SAR data transmission is presented. An isoflux pattern is suitable for SAR data transmission of LEO satellite requiring wide angle coverage of the earth for the longer time visibility. Also, it is advantageous to provide uniform power density over the earth and constant power transmission to the ground station during the passage on the orbit. Based on the principle of generating isoflux pattern, we design basic isoflux pattern antenna which shows required isoflux characteristics. For improved performance, the basic antenna is optimized with genetic algorithm. The optimized isoflux pattern antenna is designed and implemented and shows rapid skirt characteristics, low side lobe, and low back lobe level.

Active Spherical Phased Array Design for Satellite Payload Data Transmission

Abstract: Spherical phased array antennas (SPAAs) are of particular interest for transmission of payload data of low earth orbiting (LEO) satellites to the ground stations. They can be designed to scan large part of the radiation sphere with constant directivity. This helps in designing highly agile spacecrafts. In this paper, practical design aspects of spherical arrays for achieving an optimum configuration to meet a specified goal are discussed. The new concept of sharing the hardware among the radiating elements and the effects of the failure of few of them are also studied in detail. Measured results of two arrays with completely different configurations but providing almost similar performance are discussed corroborating the design concept.

Design of concentric ring antenna array for a reconfigurable isoflux pattern

Abstract: This report presents a novel design of concentric ring antenna array for a reconfigurable isoflux pattern. The array considers 61 disk patch antennas including mutual coupling by using the cavity model at the frequency of 2.8 GHz. The problem consists in finding out a few levels of excitations for the disk patch antennas. Harmony search algorithm and particle swarm optimization are implemented for this optimization problem. This novel design permits to reduce the complexity of the antenna hardware in the whole antenna system mounted in a satellite, where the volume occupation and heat dissipations are critical issues.

Design of sparse concentric rings array for LEO satellites

Abstract: This paper introduces the design of sparse concentric rings array for isoflux coverage to Earth surface over a visibility cone of more than 100°. This design of concentric rings antenna array considers the optimization of the angular separation between the antenna elements and the amplitude excitation across the array in order to generate the characteristics of the desired isoflux radiation. Simulation results using an evolutionary multi-objective optimization method are provided in this document. Furthermore, an analysis of several design cases of sparse concentric rings array for wide isoflux patterns considering a different number of antenna elements for Low Earth Orbit satellites is achieved.

A Low-Loss Planar Ka-Band Antenna Subarray for Space Applications

Abstract: This paper presents the design, optimization, and experimental characterization of a planar antenna subarray for space applications. The proposed component is intended to be used as a building block for a large Ka-band antenna systems. It is a one-dimensional linear array fed using a standard rectangular waveguide. It includes a transition between the waveguide and the beam forming network (BFN), the BFN itself and six radiators. A planar BFN and planar radiating aperture-fed double stacked circular patches are used to guarantee the low-profile of the proposed element. To ensure low losses and to reduce the mutual coupling inside the BFN, the suspended stripline (SSL) is selected as the transmission line. Due to the tight requirements on RF performance and the limited space available, novel components, such as waveguide to SSL transition and SSL power dividers, are proposed. The design is optimized using a step-by-step procedure. A complete subarray prototype has been fabricated requiring no-less than six different manufacturing technologies. The experimental results have validated the numerical simulations and show a good overall performance and low losses with efficiency above 70% in the frequency band 25.5-27 GHz (5.7%).

Low-Profile Dual-Polarized Isoflux Antennas for Space Applications

Abstract: Design, realization, and measurements of an $X$ -band antenna for data downlink (DDL) from low Earth orbit (LEO) satellites are presented. This antenna has an isoflux radiation pattern and operates in dual circular polarization with cross-polar discrimination (XPD) higher than 18 dB on the operational bandwidth. Two solutions are first proposed: one realized by a metasurface with circular strips printed on a dielectric slab and another realized by concentric metallic corrugations. Starting from a basic scattering mechanism of a self-complementary ring-type metasurface excited by a perfectly polarized source, both these antennas are designed by optimizing an equivalent anisotropic impedance surface excited by a short hat feed. The corrugated antenna is realized and measured, confirming that the performances are compliant with the requirements for next-generation DDL antennas.