DBpia Recommended Articles More recommended articles! Measured and simulated reflection coefficient versus frequency of the proposed Quasi-Yagi loop antenna prototype I. The antenna presents end-fire radiation pattern for all of the frequency bands. Login now to get unlimited access to the articles that your institution is subscribing. A truncated ground plane is designed on the bottom side of the antenna.
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Liquid metal stretchable unbalanced loop antenna. Abstract This paper describes a wideband double dipole quasi-Yagi antenna fed by a microstrip-to-slotline transition.
Design of Broadband Quasi-Yagi Antenna Using a Folded Dipole Driver
Varactor diodes were used in the driven element and in the directors for continuous tuning of resonance frequency [ 17 ]. The programmable pneumatic micropumps are used for injecting controlled amount of liquid metal in the microfluidic channels. The simulation and measurement results are slightly different which is possibly because of inaccuracy in the PDMS loss tangent.
The gain of the proposed antenna versus the number of directors is plotted for all the frequency bands, as presented in Figure 3 b. If you are a member of a university fokded institution that has a subscription agreement with DBpia, you can use the articles in the scope of the contract free of charge. Non-member purchase Non-member Purchase History.
Simulated and measured return losses of the presented quasi-Yagi antenna. Full-text article downdloads count since uing Design of reconfigurable slot antennas.
The second microbolometer terminal will be connected to one section of the ground reflector. Received Aug 6; Accepted Aug In addition, a feed and matching configuration is antfnna to enable coupling a microbolometer element to the proposed Quasi-Yagi antenna designs for performing radiation pattern measurements. The other design utilizes dipole antenna with rectangular shaped patch directors in front of it.
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The antenna peak-realized gain and radiation efficiency are calculated throughout the frequency band of interest. The length of the injected liquid metal in the director L 01 and L 1dir corresponding to highest peak gain are listed in the Table 1.
The simulated antenna radiation patterns are also calculated and presented in Figure 8. The width and thickness of the microbolometer structure will be exactly determined subsequent to a precise characterization of the electrical resistivity of the available material at the time of fabrication. For this purpose, a novel feed and matching section configuration is presented to permit coupling the microbolometer to the developed Quasi-Yagi loop antenna.
A Novel Design of Folded Dipole for Broadband Printed Yagi-Uda Antenna
As shown from the simulated results, a good radiation pattern is achieved having a maximum gain of 6. The Si substrate is coated on both sides with a 1.
Settings for citing format. The 3-D radiation pattern was measured in a shielded radio frequency anechoic chamber [ 31 ] at the lower and upper frequency bands and presented in Figure 7 a,b. The final antenna antenja is presented in Figure 5 a.
The reconfiguration time for the entire tuning range was measured as 1. In Figure 2 b,c, the parametric study is performed brosdband the length L 0 of the liquid metal in the microfluidic channel associated with the driven element to obtain the operating frequency of the other bands.
Microfluidically Frequency-Reconfigurable Quasi-Yagi Dipole Antenna
Please enter your institution name and select it from the list of autocompletion. In order to enhance the front-to-back ratio of the Quasi-Yagi antenna, another design based on a series-fed two-bowtie dipole array is presented [ 5 ]. Various solutions can be used for this purpose.
The optimized length of L 1dir is selected uusing 44 mm, 50 mm, and 54 mm for the 2. The results are given antenha the next section with a detailed comparison between the two antenna prototypes. The proposed antenna comprises a metal-printed driven dipole element and three directors.