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This paper presents design of the novel alternating-phase fed array with linearly slot arrangement for grating lobe suppression. Slots at the center of the broad wall are excited by the inductive wall and the reflection is suppressed by the capacitive wall at each slot. Then, the prototype array with 16 slots on each waveguide is tested at 25 GHz. Good radiation pattern with broadside radiation of...
It is difficult to obtain far-field radiation patterns of electrically large scale antenna, for example a base station array antenna of mobile communications, when the distance between Tx and Rx is less than the Rayleigh distance 2D2/lambda, where D is the aperture of antenna and lambda is the wave length. A far-field measurement method for such antennas using a synthetic aperture antenna and a conventional...
A novel CPW fed stacked circular MSA with the DGS slab has been presented. Bandwidth and gain of the multiband planar antenna are enhanced. The DGS slab has a function to separate the typical frequencies of the stacked CMSA and to improve the impedance matching as an impedance transformer. Experiments were carried out to verify the results predicted in the simulation. Good agreement between the measured...
This paper presents design of the slot array for grating lobe suppression. The slots arrayed at the center of the radiating waveguide are excited by the inductive wall, while the reflection from each slot is canceled out by the capacitive wall. Slot coupling and the condition of the reflection canceling are analyzed by using Ansoft HFSS. Then, the 16-slot array is designed at 25.33 GHz. Uniform aperture...
A design and performances of a single-layer U-slot MSA have been presented in this paper. The antenna was fabricated easily compared to the conventional two-layer U-slot MSA. The test antenna has good return loss, gain and radiation pattern characteristics at the four operating frequencies and demonstrates that it is a good candidate as a multiband planar antenna.
In this paper, we propose a novel stacked circular microstrip antenna (C-MSA) fed by a CPW. The planar EBG structure is used to obtain broadband performance for dual operating frequencies. The bandwidth of 6.73 % and 7.55 % are obtained for the low- and high-frequency bands, respectively. Moreover, broadside radiation patterns and gains of about 8.0 dBi in average are also obtained over the both bandwidths...
This paper demonstrates a novel multiband rhombic microstrip antenna (MSA) with multiple slots printed on a single-layer PTFE substrate. The antenna is fed by a coplanar gap coupled with a V-shaped patch. Three inverted V-shaped slots are assumed on the rhombic patch and hence four resonant frequencies are obtained. Broadside radiation patterns and gain of over 5.0 dBi are also obtained. Experiments...
This paper demonstrates a novel multiband rhombic microstrip antenna (MSA) with multiple slots printed on a single-layer PTFE substrate. The antenna is fed by a coplanar gap coupled with a V-shaped patch. Three inverted V-shaped slots are assumed on the rhombic patch and hence four resonant frequencies are obtained. Broadside radiation patterns and gain of over 5.0 dBi are also obtained. Experiments...
This paper presents design of the T-junctions in the alternation-phase fed array for a sector shaped beam in the E-plane radiation pattern. The sector beam is very effective for radar applications detecting obstacles in a certain angular range without scanning. Design and measurements are performed in 60 GHz band.
A novel printed monopole antenna for UWB applications is presented in this paper. A monopole with a combination of a half-disk and an inverted triangle is installed on a finite ground plane. A slit on the ground plane performs as an impedance controller to obtain matching over wide frequency range. Impedance bandwidth of more than 1:6 is achieved with VSWR<2. Omni-directional patterns are confirmed...
A fractal model for a planar antenna has been widely investigated as an effective antenna for achieving multi-band performance. In this paper, a modified equilateral triangular microstrip antenna (MT-MSA) with folded slots is proposed to achieve multi-frequency operation. The proposed antenna is fed by an L-probe and has folded slots having constant intervals. Experiment results showed that satisfactory...
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