Abstract
A centre-fed dual band (3.5GHz/5.8GHz) omnidirectional microstrip array antenna for using in wimax applications is presented. Two distinct series fed back-to-back subarrays separated by a power divider are designated for these two bands. The proposed centre-fed structure reduces interference of two subarrays and provides a flexible progressive phase and so independent tilt angle control in dual bands. In addition, it is shown that compared to edge-fed dual band structure, the centre-fed structure makes the use of low permittivity substrates possible which are more appropriate for antenna radiation. The fabricated antenna can cover 3–3.7GHz and 5.4–6.4GHz frequency bands with S11<−10dB. It also shows about 10° down tilt in both frequency bands.
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