Abstract, One of the vast evolution of wireless technology is WiMAX
technology. The frequency band of WiMAX in Indonesia is 2.3 GHz
(2.3-2.4 GHz) and 3.3 GHz (3.3-3.4 GHz). Antenna is one of the most
important component in wireless communication. Due to the
presence of two frequency bands of WiMAX used in Indonesia, there
is a need to develop an antenna that can operate in both frequencies.
This paper discusses the design of coplanar waveguide (CPW) fed
octagon shaped microstrip antenna. The antenna microstrip design
uses FR4 substrate with dielectric constant of 4.6. The antenna
dimension is 30 mm x 45 mm. From the simulation results, it can be
seen that the antenna design proposed by the author has a wide
bandwidth that includes frequency band of 2.3 GHz and 3.3 GHz.
The antenna gain falls between 1.8 – 2 dBi with omnidirectional
radiation pattern.Gunavathi dan S. Raghavan [2], however the operating
frequency only operates at 5 GHz upwards. Hence, it can not
be used in WiMAX application in Indonesia. Research on
microstrip antenna with octagonal shaped patch was done by
Cheng-Hsing Hsu et al. [3] However, its lowest antenna
frequency was around 3 GHz without CPW fed. Monopole
wideband CPW fed microstrip antena was studied by K. P.
Ray and S. Tiwari [4]. However, the hexagonal shaped patch
and its relatively large size is not suitable for mobile
appliances usage.
This paper will discuss on the design of octagonal CPW
fed microstrip antenna which operates at 2.3 GHz and 3.3
GHz frequency band for VSWR < 2. The designed antenna
has the largest dimension of 45 mm x 30 mm x 1.6 mm.