A frequency reconfigurable printed Yagi-Uda dipole antenna for cognitive radio applications. The antenna resonant currents will be dissipated in the microbolometer located at the feed of the antenna causing joule heating in the microbolometer element. It consists of a driven element, a reflector, and one or more directors to create end-fire radiation characteristics. References Publications referenced by this paper. Next, the driven-element length is varied by the injecting liquid metal in the microfluidic channel of the driven element to obtain the operating frequencies of the other desired bands. Furthermore, for matching impedance of microstrip line and coplanar strip line, impedance transformers are utilized. We will notify you whenever a new paper by the selected author is updated.

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Change settings for naming of downloaded file. The optimized dimensions for the microbolometer are the same as the previous design.

Bandwidth enhancement of a planar printed Quasi-Yagi antenna with size reduction. With the optimized parameters, an operating band of 1. If you want to be modified the authors information such as a research field, article list, please put the request as specific as possible after entering the requesters name and e-mail.

The fabricated Quasi-Yagi loop and dipole antennas are shown in Figures 1 a and 6 arespectively.

The antenna gain is rboadband increased with three directors. The proposed antenna designs have good performance compared to the other work. Finally, the remaining photoresist was then removed using acetone. Dipole antenna Search for additional papers on this topic.


International Journal of Antennas and Propagation

Vertically multilayer-stacked yagi antenna with single and dual polarizations. Please review our privacy policy. Next, microfluidic channels are designed on the driven element and directors for injecting liquid metal to reconfigure the operating frequency and to maintain a high gain for each band.

The pump voltage and pump frequency can be directly changed with the rotary control elements of the board.

The microfluidic channels are integrated with the driven element and the directors, whose effective length can be adjusted by injecting a liquid metal in the microfluidic channels.

A Novel Design of Folded Dipole for Broadband Printed Yagi-Uda Antenna

The geometrical configuration and seen structure of the proposed Quasi-Yagi loop antenna prototype I are introduced in Figure 1. The following steps were performed for fabricating the printed antenna structures.

Novel feed and matching configuration to allow coupling a microbolometer element is proposed to enable a simple method for radiation pattern measurement. Profile name Please wait.

Don’t show this today Close. Measured 3-D radiation pattern of the antenna at a 1. Next, L 01 is determined to achieve highest peak gain corresponding to each resonant frequency.

Indexed in Science Citation Index Expanded. The optimized parameters for the developed microbolometer are found to be as follows: A truncated ground plane is designed on the bottom side of the antenna.


Open in a separate window. Biasing networks that can interfere with radio-frequency RF are not required for frequency tuning by this strategy. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution CC Antenna license http: The proposed Quasi-Yagi antenna using elliptical loops oof of regular dipole elements is a novel design.

For this purpose, a novel feed and matching section configuration is presented to permit coupling the microbolometer to quasi-yayi developed Quasi-Yagi loop antenna. A micropump is used for the injection of liquid metal in the microfluidic channels.

Design of reconfigurable slot antennas. The simulation and measurement results are slightly different which is possibly because of inaccuracy in the PDMS loss tangent. Check if your institution subscribes to DBpia.

Microfluidically Frequency-Reconfigurable Quasi-Yagi Dipole Antenna

The magnified version of the microfluidic channels with empty, and completely filled states are presented in Figure 5 b. From This Paper Figures, tables, and topics from this paper. However, the asymmetry of those antennas also deteriorated their radiation performances.