Abstract
As the usage of wireless technology grows, there are evermore demands on the antennas that support these platforms. This need has led to the design of unique antennas with improved bandwidth, agile frequency capabilities, compact size and greater efficiencies. In part though, the trade-off for such capabilities is antenna complexity. This paper presents a new technique for simplifying the method of changing the operation of a printed antenna using micron-sized silver coated particles that respond to magneto-static fields. More specifically, a structure consisting of a low-loss dielectric material with a cylindrical cavity containing micro-sized particles is developed. The overall size of the dielectric material is 1.5 mm $\times 1.5$ mm $\times 0.5$ mm and the cavity has a diameter of 0.9 mm. Furthermore, the top and bottom of the cavity with the micron-sized particles is capped with copper foil. Then, to manipulate the enclosed particles, a static magnet is placed near the structure. The enclosed particles columnize and orientate in the direction of the field-lines, connecting the top and bottom copper foil plates. To disconnect the plates then, the field is simply removed and the columns collapse. Macroscopically, the structure has the behavior of a switch. The structures presented in this work are denoted as Magneto-static Field Responsive Structures (MRSs). The MRSs have an additional benefit of not requiring a direct connection to a biasing circuit. This is very useful because there are many antenna designs that make it difficult to embed biasing circuitry to reconfigure printed antennas using MEMS and PIN diodes, for example. Finally, a new frequency reconfigurable Electromagnetic Band Gap (EBG) antenna is presented. This design is unique because the complex layout does not allow for traditional biasing circuitry and the operation is changed using the new MRSs presented in this paper.
Highlights
Antennas with features such as compact geometries, unique frequency agile characteristics and ease of use continue to be of great interest to antenna researchers and designers in many different areas [1]–[3]
Current was mainly distributed on the patch, this made the electrical length of the antenna shorter and the Electromagnetic Band Gap (EBG) antenna resonated at a higher frequency in the Magneto-static Field Responsive Structures (MRSs) ‘OFF’ state
High Frequency Simulation Software (HFSS) was used for the simulation of the EBG antenna and MRSs, whereas a calibrated Agilent E5071C Vector Network Analyzer (VNA) was used for the measurements of the S-parameters
Summary
Antennas with features such as compact geometries, unique frequency agile characteristics and ease of use continue to be of great interest to antenna researchers and designers in many different areas [1]–[3]. Multi-radio platforms (i.e., mobile internet devices, laptops, smart phones etc.). These systems are being required to access multiple wireless services such as WiFi, WiMax, 3G, Bluetooth, GPS and UWB over various frequency bands [4]. Reconfigurable antennas is an area where there has been significant development on using various methods for controlling the agility of antennas. These efforts have shown promising results that most commonly include using Field Effect Transistors (FETs), PIN diodes and MEMS devices to enable frequency reconfigurable antennas [5]–[12].
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