Design, simulation, and fabrication of cubesat antenna systems

Download
2020-9
Dolapçı, Türker
This study aims to design, simulate, and fabricate on-board and ground station antenna systems for CubeSats, i.e., the most affordable space missions. An on-board UHF turnstile antenna system is optimized in simulation evironment in accordance with different pattern requirements, by changing the orientation of the antenna arms. In order to feed the turnstile antenna arms by successive 90◦ phase differences between them, a four-way quadrature splitter circuit is designed and fabricated. Antenna pattern measurement is conducted in anechoic chamber by connecting the monopole antenna arms to the fabricated power splitter circuit, while the arms are oriented in the optimized directions and placed on a generic 1U CubeSat platform. In addition to the fabricated UHF turnstile antenna, a novel dual-band V/UHF trapped turnstile antenna involving traps on the antenna arms is designed in simulation environment. On the other side, a circularly polarized VHF ground station Yagi antenna system is designed to achieve optimum gain and size, and it is also fabricated by using low-cost materials to be employed for amateur radios. In addition to the radiating metal structure, the VHF Yagi antenna system includes a Wilkinson power divider and impedance matching baluns fabricated by coaxial transmission lines. Besides the reflection coefficient measurements, the constructed ground station antenna system is used for the reception of a Slow Scan TV (SSTV) image broadcasted by International Space Station (ISS) to test its functionality. Finally, as another component of a sub-GHz CubeSat ground station, a circularly polarized UHF Yagi antenna system is designed, based on the experience gained from the VHF ground station antenna design and measurement.

Suggestions

Design of an active microstrip array using a microwave circuit simulator
Demir, S; Toker, Canan; Hizal, A (1997-02-26)
An active antenna array design and simulation of this design with a microwave circuit simulator are presented. This active antenna array is a TV receive only (TVRO) antenna operating at 10 GHz. It is a 8x4 array of rectangular microstrip patch antennas. Eight low noise pHEMTs are placed in the antenna. Passive antenna characteristics are usually obtained by analytical techniques or using special softwares for this purpose. The numerical representation as well as the nonreciprocal nature of the active device...
Design and analysis of ultra-wideband (UWB) printed monopole antennas of circular shape
Karadağ, Serkan; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2017)
This study proposes three microstrip line fed circular monopole antennas with ultra-wideband (UWB) characteristics, improved omnidirectional radiation pattern and WLAN (5 GHz-6 GHz) band notched characteristics for wireless and mobile communication systems. In this thesis, first, a microstrip line fed ultra-wideband ring monopole antenna with improved omnidirectional radiation pattern is designed, fabricated and measured. Two corners are tapered on the ground plane for increasing impedance bandwidth. In ord...
Beam Steerable Traveling Wave Meander Line Antenna Using Varactor Diode for X-Band Applications
Gokalp, Nihan; Aydın Çivi, Hatice Özlem (2008-07-11)
This paper presents a novel beam steerable meander line antenna with varactor diode for X-band applications. Beam steering has been achieved by loading the arms of the meander line antenna with varactor diodes. The capacitances of the varactor diodes have been controlled by DC bias voltage. Instead of varactor diodes, RF-MEMS variable capacitances can be used to scan the beam. Since the insertion loss of MEMS capacitances are small compared to loss of varactor diodes, use of MEMS capacitors will increase th...
Novel Wearable Radio-Frequency Antennas Based on Woven Conductive Fabrics
Dolapci, Turker; Baloglu, M. Sezgin; Mutlu, Feza; Ergül, Özgür Salih (2018-11-02)
In this study, a new practical method for fast fabrication of low-cost wearable antennas is introduced. The antennas are directly cut from woven conductive fabrics, while their terminals are connected to microchips by using a repair glue. Following simple trials to demonstrate the fabrication procedure, high-performance radio-frequency antennas that are suitable for the proposed method are designed in a simulation environment based on the multilevel fast multipole algorithm and genetic algorithms. Simulatio...
Analysis of a calibration method for airborne receive-only phased array antennas with self-alignment
Elik, Furkan Bahadır; Demir, Şimşek; Department of Electrical and Electronics Engineering (2022-9-15)
The calibration of the phased array antennas plays crucial role to ensure the performance of the beam steering capability. Most of the guided missiles utilize phased arrays, thus, the calibration routines should be optimized. Since guided missiles are spatially limited, calibration hardware should not introduce new geometry to the antenna. This limits possible calibration methods of the antennas on the missiles. This study develops a calibration method for semi-active guided missiles and analyzes this metho...
Citation Formats
T. Dolapçı, “Design, simulation, and fabrication of cubesat antenna systems,” M.S. - Master of Science, Middle East Technical University, 2020.