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In this letter, a new type of resonant series slot array antenna for Ka-band for 45° linear polarization (LP) is described. Sixteen radiating slots, tilted at an angle of 45°, are separated by one-half guided wavelength due to use of the alternating inductive and capacitive load slot pairs. These alternating reactance slot pairs allow this novel antenna to achieve impedance matching, uniform field...
Slotted-waveguide array antennas are attractive because of their low-loss characteristics in high frequencies. Several types of slotted arrays whose polarization angles are inclined to the waveguide axis have been reported. In this paper, we propose a new type of slot array antennas on a rectangular coaxial line for minimizing the waveguide width. As opposed to a conventional waveguide, there is no...
A circularly polarized slot radiator in millimetre band is presented. Low reflection and good polarization performance is obtained in comparison with state of art slot elements. A high gain array prototype has been implemented in substrate integrated waveguides (SIW) technology, in order to check the new element performance. A cosecant amplitude coverage in the elevation plane, as well as a 6° tilted...
Ground penetrating radars attract attention of many researchers as a new technique to visualize antipersonnel plastic landmines. Previously we proposed a high-density and wideband array that realizes high-resolution and quick imaging. However, the high-density array sometimes suffers from direct coupling among antenna elements, which decreases the performance of the landmine detection. In this paper,...
The tolerance of coupling slots is a major factor to determine the performance of the waveguide slot array. Consequently, it is significant to discuss the effects of coupling slots tolerance on the slot array performance. In this paper, the effects of slot dimensions on the resonance frequency are analyzed at first. Secondly, the effects of equal-area bulletheaded slot on the resonance frequency is...
We have presented the design, analysis and development of a Ka band digitally beamformed 1 m x 1 m slot array. The array was found to be successful in meeting the objectives of GLISTIN demonstration antenna, especially with respect to the difficult 0.042deg relative beam alignment between sticks.
This paper presents the non-iterative design for a waveguide slot array with cavities. The cavity dimensions to make the active slot admittance equal to that of an isolated slot are irrespective of the slot coupling except for a strong coupling. We can use the parameters of the isolated slot in the half-free space for required coupling. Once the slot parameters are determined, they are not iteratively...
In this paper, the magnetic field distribution of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot is presented. The correlations between the field distributions of the antenna and the mode-based field distributions are presented. The radiation pattern, magnetic field distribution and magnitude of S11 are investigated in the terms of the length of the...
An antenna array is designed in low-temperature co-fired ceramic (LTCC) Ferro A6Mtrade for a mm-wave application. The antenna is designed to operate at 94 GHz with a few percent bandwidth. A key manufacturing technology is the use of 3 mil diameter vias on a 6 mil pitch to construct the laminated waveguides that form the beamforming network and radiating elements. Measurements for loss in the laminated...
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...
Increasing functionality demands along with tightened constraints on RF-front-end size, weight and cost, has shifted architectures from multi-system to single yet multifunctional system designs. One of the significant challenges of such systems lays on the design of multifunctional radiators. UWB antenna apertures (arrays) can meet the demands of such designs because they offer large bandwidth, gain...
We observed coherent power combination in 3- and 6-element oscillator array using resonant tunneling diodes coupled through planar circuits in sub-THz range. InGaAs/AlAs resonant tunneling diode oscillators with slot antennas are arranged collinearly on the same InP wafer, and coupled with each other through a metal-insulator-metal stub structure. In 3-element array, a single peak at 293 GHz with...
This paper presents the radiation characteristics of two-slot array antenna on a concentric sectoral cylindrical resonator excited by a coupling slot. The magnetic fields inside the sectoral cylindrical resonator for the first few modes are presented with sectoral angle of 60 degrees. It shows that the appropriate mode for a slot array antenna on a concentric sectoral cylindrical resonator is the...
A 2-D choke structure is analyzed by the method of moments (MoM) for the study of isolation characteristics between closely arranged two waveguide slot array antennas. In this paper, two-dimensional (2-D) TE problem is considered. Parametric study is performed to understand the mechanism for obtaining the small coupling.
A linear array of transverse slots on the broad-wall of a hollow waveguide suffers the grating lobe problem because the element spacing is longer than the free-space wavelength. In order to solve this problem, a parasitic dipole quartet is introduced for each slot instead of the dipole pair. This is confirmed experimentally. A 6-element array using this configuration with reflection-canceling posts...
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