Wideband balun design with ferrite cores senior project california polytechnic state university, san luis obispo paul biggins june 21, 2014. Space constraints in the pyramidal shield and the need for wide bandwidth make a taperedline design ideal ferrite core baluns are too bulky. Pdf in this paper the traditional tapered microstrip balun transformer is modified by bending its whole structure to. Jerry sevick and are hand wound with best available components to provide highest possible efficiency. The design and experimental results of low profile microstrip dipole antenna with tapered balun shows fairly good. This structure, called a tapered balun also called microstriptobalanced stripline balun, fig.
Ansoft hfss program guided us to find these values by using the dimensions of the line 1. Figure 3b represents the phase inverter block in the proposed balun design. Established in 2005, balun designs builds exceptional quality baluns and ununs for amateur radio, military and commercial applications. A wideband printed dipole antenna with optimized tapered feeding balun for ism and fwa bands theodore g. Tapered microstrip balun for ata feed development abstract. Exponentially tapered balun with varying width and spacing were. In this section, broadband bow tie antenna designed with tapered balun configurations is presented. Design of a tapered balun for broadband arrays with. Flexible spiral antenna with microstrip tapered infinite. The tapered microstrip line to parallel striplines balun is integrated with a single.
In this design, the dipole antenna fed network with tapered balun is studied. The parallel tapered lines are tightly coupled with a smallest separation distance equals to 0. Simulations are based on two 3d model of linearly tapered microstrip balun structure. The design and characterization of a microstrip wideband balun are presented in this work. The principle of operation of a tapered balun is presented on this page. A printed dipole antenna with microstrip tapered balun. Tapered baluns a coaxial cable and b microstrip transmission line. Two kinds of balun multisection and exponential baluns are used as feed transmission line to the antenna proposed. Introduction the current design of the ata feed is a nonplanar logperiodic antenna with a 20 opening angle. Pdf bent tapered microstrip balun transformer researchgate.
Pdf this work presents a broadband tapered balun with different sizes using. Most of our units are derived from the researched and tested designs of dr. A hams guide to rfi, ferrites, baluns, and audio interfacing revision 7 jan 2019 by jim brown k9yc the basis of this tutorial is a combination of my. In order to design a tapered microstrip balun we need the characteristic impedances of this line at the input and the output ports. Archimedean spiral antenna and with an array of spiral antennas. Pdf a wideband printed dipole antenna with optimized. On the other hand, it is well known that a tapered microstrip line can be used for impedance transformation. This balun is simple to understand it gradually changes the shape of an unbalanced transmission line to that of a balanced line. Due to the tight space left in the array for designing the feeding structure, an extended and staggered struc ture of the tapered baluns is adopted. A wideband printed dipole antenna with optimized tapered.
High impedance ratio baluns are easy to design using flux coupled transformers, but much more difficult for. Therefore, its necessary to design a balun component in parallel with antenna element and. In the following sections, the microstrip tapered infinite balun design is introduced on a flexible substrate for wearable antenna applications. Between the arms of the antenna is located a square pyramidal.
Why you need a current balun 15 dec 2014 5 va7jw figure 4 is a redrawn as a block diagram of figure 3. Tcpw coplanar waveguide tapered linearly in the lower slot. The coupled lines w2 and w8, w3 and w9, w4 and w10, w5 and w11 constitute the foursection coupled line configuration. A wideband printed dipole antenna with optimized tapered feeding balun for ism and fwa bands. The proposed balun design has a tapered microstripline transition on one side and a triangularshaped gp backing on the other side of a thin substrate t. Pdf exponential tapered balun with different sizes for uwb. Figure 4 the voltage source v is the antenna voltage at the feed point with respect to. Micro strip balun for tem horn antenna used in level.
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