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It is known that a loop antenna of one wavelength circumference radiates a linearly polarized wave in the direction normal to the antenna plane. It is also known that, when perturbation elements are added to the loop, the linearly polarized wave can be changed to a circularly polarized wave [1]. For mobile communications, the circularly polarized wave at low elevation angles is often required to have...
The antenna characteristics of helices for the normal and axial modes [1] have been theoretically revealed using numerical techniques. However, little theoretical analysis has been performed for revealing the antenna characteristics of the conical mode [2][3]. With this background, this paper presents the antenna characteristics of the conical mode helix. The antenna characteristics presented here...
A metaloop antenna that has a negative propagation phase constant for the current on its closed arm is proposed and investigated. A linearly polarized (LP) broadside radiation pattern is obtained at different frequencies below and above frequency fT, where the propagation phase constant is zero. In addition, it is revealed that the metaloop forms an LP dual-peak radiation pattern at different frequencies...
A dual-loop antenna, each loop having a single wire, is analyzed using the method of moments. Special attention is paid to the bandwidth for a 3-dB axial-ratio criterion. A comparison between the reference and modified antennas reveals that the bandwidth can be enlarged by a factor of two.
Two composite antennas are investigated as a triple-frequency element. First, a double-loop antenna with a C-figured loop is analyzed using the moment method. Secondly, on the basis of the radiation characteristics we analyze another double-loop antenna with two L-figured wires. It is found that the antenna has almost the same triple-frequency characteristics as those of the double-loop antenna with...
This paper shows the simulated performance of the small antenna with the effects of the package cover and the device box at 60 GHz band. The total thickness of the package has been reduced from 2.6 mm to 1.4 mm by using the designed cover. The gain is enhanced and the reflection is suppressed lower than −15 dB by using different ways of packaging. On the other hand, the small antenna is put in a 120...
This paper reports a post-wall waveguide aperture antenna with directors for the mobile terminal of the wireless file-transfer system using 60-GHz band. The antenna was fabricated using a conventional multilayered printed-circuit board process technique. The fabricated antenna has two directors and its size is 8.7 mm × 6.4 mm × 1.0 mm. The antenna gain was measured to be 6 dBi in the frequency range...
When more than two electronic tags respond to a reader request, the request fails. This is referred to as the collision problem. To overcome this problem, a novel electronic tag readout method, termed the response probability control method (RPCM), is proposed in this paper. In the RPCM, the reader indicates the response probability of a request, ensuring rapid and simultaneous readout of multiple...
Recently, we have analyzed a spirally-wound antenna [1][2] proposed by Fenwick using the method of moments. The analysis shows that the. input impedance is very low (less than 4 ohms). It is also shown that the frequency bandwidth is very narrow (less than 0.2% for a criterion of VSWR = 2 to an input resistance at resonance). In this paper, we realize higher input resistance over a wider frequency...
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