Multiband Ring Fractal Monopole Antenna for Mobile Devices

Multiband Monopole Antenna with Sector-Nested Fractal

“…The electromagnetic analysis of the antenna is done by means of finite-difference time-domain (FDTD) using the commercially available HFSS. Table 1 demonstrates that: 1) With the increase of 1 h and 2 h respectively, the center frequency of the low pass-band is shifting obviously, and two dimensions 1 h and 2 h which form the first fan-ring have the same change trend. It can be observed that the low resonant frequency is the result of the combination of 1 h and 2 h ， the two jointly affect the low resonant frequency and bandwidth; 2) It shows that size of the largest sector-loop is correlated with the wavelength of low ( 1 f and 2 f ) resonant frequency, which can be used to figure out sidelength of the sector-loop.…”

“…Thus, the outer most fan height and first resonance frequency has an inversely proportional relationship, that is, with the increase of 1 h , the corresponding reflection loss of the first band center frequency will be decreased.…”

“…The experiential formula of antenna size can be established from simulation, which indicates the relation between fan side-length and the wavelength of corresponding resonant frequency, as is shown in the following: 0.14~0.15 l λ = . According to the above discussion and in order to realize the multi-bands, the structural parameters of this antenna can be set as: 1 Figure 7 shows the antenna simulated results. It can be seen from the simulated results that the antenna has operating bands of 2.38 -2.785 GHz, 3.21 -3.82 GHz and 4.42 -6.825 GHz respectively, and the bandwidths can meet the requirement of WLAN/WiMAX communication.…”

“…There are many methods proposed to realize the miniaturization characteristic of the antennas, including resonant units [1] [2], different patterns [2] [3], antenna loading [4], surface of the slot [5], electronic reconfigurable [6], and adopting reconstructed structure [7]. These methods are so specialized that only some aspects of the demand can be met, while the overall performance of the antenna is decreased in order to satisfy the communication system.…”

Compact Uwb Antennas With Inverted E- And F-Shaped Slots for Bandnotch Characteristics

“…Various types of band-notch techniques have been studied [4][5][6][7][8][9][10][11], such as using H-shaped conductorbacked plane [12], modifying two U-shaped slots on the patch [13], inserting two rod-shaped parasitic structures [14], using spurlines [15], embedding resonant cell in the microstrip feed-line [16], utilizing a small resonant patch [17], and using an MAM and genetic algorithm [18]. However, these antennas have both large radiator and size.…”