In this article, compact antenna with high gain and circular polarization (CP) for WiMAX applications is noticed. Using metamaterials with negative permittivity and permeability improves the antenna parameters; thus, the prototype antenna is designed based on metamaterial composite right-/left-handed to achieve CP and compact size. The final antenna has directional pattern and high gain with CP at 3450MHz. The antenna gain is 8.28 dBi. The size of prototype patch antenna is 30 3 30 mm 2 . It is designed and fabricated on Taconic TLY-5, Laminate substrate with e r 5 2.2 and thickness of 1.6 mm. It is simulated by CST microwave studio and HFSS. Also, equivalent circuit and experimental results are presented and compared here.
half-power angle in the vertical plane is 5.4 (q 5 624.0399). The height of the reception point is h 5 2.5 m. Measurements were conducted using a transmitter antenna tilt of 6 and 10 . The estimated slope of the street was 3.8 . The propagation environment is a canyon street and, therefore, the COST-WI model for free space properly represents the propagation environment (c 5 2.6). Considering the tilt of 10 , (1) gives X exp max 5 78 m and (5) states that the maximum location of exposure to electromagnetic fields should be found in the interval (64 m, 99 m). The measured maximum exposure location is at X 5 67 m, within the calculated region. Considering a tilt of 6 , X exp max 5 105 m and the region calculated using Eq. (5) is in the interval (82 m, 145 m). The measured maximum exposure location is at X 5 107 m.
CONCLUSIONThis letter proposes a method to calculate the region that contains the location of maximum exposure to RF EMF. In real environments, this point can be some dozens of meters far from the point estimated using (1). When evaluating the field strength at X exp max , if the measurements were close to the established limit, the location can be considered compliant, even if the radiocommunication station is not, once the field strength at other point may be higher than the limit. Thus, it is necessary to assess the field strength in the region R around X exp max and perform spatial averaging appropriately. The method proposed in this letter shows how to define this region. Results show that the proposed method is compatible with field measurements data. 2.
parameters. The antenna shows peak gain of 2.36 dB and 92.81% average radiation efficiency over the entire operating band. Furthermore, radiation patterns throughout the operating band are consistent with low cross polarization level. Owing to the characteristic given above, makes this antenna suitable for modern wireless communications such as WLAN/Wi-Fi (2.4-2.
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