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A multifunction broad-beam antenna is presented for dual bands and dual circular-polarizations applications. The proposed antenna consists of a crossed dipole antenna (CDA) and four inclined monopole antennas (IMAs). The CDA is connected to a slotted coaxial Balun and fed via an impedance transformer. The IMAs are fed via a 90° hybrid network with input phases of 0°, 90°, 180° and 270°, which locates...
Two wideband microstrip patch arrays sharing a common aperture are designed for GSM, DCS and UMTS cellular deployment in this paper. The proposed arrays consist of a lower band array with 4 elements and an upper band array with 4 differently sized elements. The design of proposed shared aperture arrays helps to reduce the aperture size. In contrast to the lower-band element, two pieces of rectangular...
A novel integration method for multifunction antennas is presented. The proposed multifunction antennas sharing a common aperture consists of a coplanar waveguide (CPW) fed ultra-wideband (UWB) antenna and a UWB loop antenna. The CPW-fed UWB antenna covers 2.34–12.95 GHz and 18.9–25 GHz with VSWR < 2. The UWB loop antenna is integrated into the ground of the CPW-fed antenna with bandwidths ranging...
A novel integrated antennas are presented with dual frequencies and dual circular-polarizations (CP) in a common aperture. The proposed integrated antenna consisted of a crossed dipole antenna (CDA) and a modified quadrifidar helix antenna (MQHA). The CDA performs left-handed CP (LHCP) and covers 1.54–1.71 GHz with axial ratio (AR)<3dB and VSWR < 2. The MQHA performs right-hand CP (RHCP) and...
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