Design of asymmetric coplanar strip folded dipole antennas /

Download
2014
Karaciğer, Kamil
This thesis includes the design, simulation, production and measurement of an asymmetric coplanar strip folded dipole antenna suitable to be used as an element in a linear array operating at S-band (2.7 GHz - 3.3 GHz). In this same manner, its usefulness as an array antenna is also explored in this thesis. This antenna element consists of a microstrip line feed, microstrip to coplanar stripline transition (BALUN) and asymmetric coplanar strip (ACPS) folded dipole. The planar folded dipole can be constructed using printed circuit technology, its input impedance can be adjusted over a wide range of values, and it has significantly greater bandwidth than a single half-wave dipole and conventional patch radiators. These properties make planar folded dipole antennas an appealing choice as a radiating element. A step-by-step procedure is followed during the design process of the ACPS folded dipole antenna element. The design process is based on the simple impedance matching among antenna element components, i.e. feed, transition, and antenna. First, BALUN which consists of microstrip feed line and microstrip to coplanar stripline transition is designed and simulated using Ansys HFSS®, a high frequency vi electromagnetic field simulation program. Then, in order to investigate the effects of ACPS folded dipole parameters on the input impedance characteristics of the antenna, a parametric study is performed using Ansys HFSS®. By the help of the experience gained through these parametric analyses, an ACPS folded dipole is designed and simulated. Once the ACPS folded dipole is connected to the balun, the design of antenna element is completed. Before manufacturing the antenna element, the complete structure is simulated and optimized with Ansys HFSS® to achieve a good matching over the operating frequency range. Additionally, a linear array antenna comprising four asymmetric coplanar strip folded dipole antenna elements and a suitable power divider network to feed the array are designed and simulated. Finally, the antenna element and the four-element uniform linear array antenna are manufactured, measured, and their performances are compared with simulation results.

Suggestions

Design of magneto-electric dipole antenna for wideband communication systems
Alparslan, Semih; Alatan, Lale; Department of Electrical and Electronics Engineering (2018)
This thesis includes the design, simulation, production and measurement of a differential fed magneto-electric dipole antenna with cavity operating at ultrawideband (3.3 GHz – 10 GHz). This antenna consists of a differential feeding structure, an electric dipole, a magnetic dipole and a cavity. The ultra-wideband operation is achieved through the use of differential feeding structure and cavity. A step-by-step procedure is followed during the design process of the differential fed magneto-electric dipole an...
Design and realization a quasi yagi antenna array and its feed system printed on a ceramic substrate for x-band radar applications
Atabay, Berkay; Dural Ünver, Mevlüde Gülbin; Department of Electrical and Electronics Engineering (2019)
This thesis includes design, simulation, realization and measurement of a four-element quasi- Yagi antenna array printed on a ceramic substrate for X-band radar applications. The microstrip array antenna is designed using four quasi-Yagi antennas in a linear configuration and is printed on Alumina 99.6% substrate made by Coorstek Corporation. The antenna can fit into small areas because of compact structure due to the use of high dielectric constant substrates. In addition, the use of alumina ceramic substr...
Design of Irregularly Shaped Patch Antennas by using the Multiport Network Model
Sener, Goker; Alatan, Lale; Kuzuoğlu, Mustafa (2008-07-11)
The multiport network model (MNM) is an analytical method that is used to analyze microstrip antennas. MNM is based on defining ports along the periphery of the patch and evaluating the impedance matrix corresponding to these ports by using the Greenpsilas function for the cavity under the patch. For regular rectangular, triangular and circular patches, analytical expressions for the Greenpsilas function are available. In the analysis of irregular patches, Greenpsilas functions cannot be calculated explicit...
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 of series-fed printed slot antenna arrays excited by microstrip lines
İncebacak, Mustafa; Alatan, Lale; Department of Electrical and Electronics Engineering (2010)
Series-fed printed slot antenna arrays excited by microstrip lines are low profile, easy to manufacture, low cost structures that found use in applications that doesn’t require high power levels with having advantage of easy integration with microwave front-end circuitry. In this thesis, design and analysis of microstrip line fed slot antenna arrays are investigated. First an equivalent circuit model that ignores mutual coupling effects between slots is studied. A 6-element array is designed by using this e...
Citation Formats
K. Karaciğer, “Design of asymmetric coplanar strip folded dipole antennas /,” M.S. - Master of Science, Middle East Technical University, 2014.