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In this paper, a low-profile dipole array antenna for on-body communications in wireless body area network (WBAN) is proposed. The proposed antenna consists of eight planar dipole antenna elements. To obtain the monopole-like radiation pattern, eight dipole elements are placed symmetrically around z-axis. The simulated 10-dB return loss bandwidth of the antenna is wide enough to cover the 2.45 GHz...
This paper presents design of a microstrip antenna array fed by transverse slots on a broad wall of the rectangular waveguide with standing wave excitation for linear polarization parallel to the axis. A series-fed two-element microstrip antenna array on a dielectric substrate excited by a transverses slot of the waveguide is used as an element of the proposed array. In this paper, radiation power...
This paper presents an automatic impedance-matching algorithm that can sequentially realize a simultaneous conjugate-matching state for all the elements in an N-element array antenna. The analytical results show that the converged solution obtained from the proposed algorithm agrees well with the solution calculated by the analytical deterministic equation, confirming the validity of the proposed...
MIMO radar and Khatri-Rao (KR) product virtual array are the methods for increasing angular resolution of the array radar. The KR product is not suited to radar because KR product needs data property of uncorrelated wave incidence. However, when we extract responses of moving targets having different Doppler frequencies by Doppler filtering, the KR product array works almost properly because their...
The circularly polarized antenna using hexagonal radiating apertures was proposed, and the bandwidth for the axial ratio less than 3 dB was 6.4%. We have proposed the circular aperture array antenna for increasing the axial ratio bandwidth. In this paper, the design of the radiating part for the circular aperture array is presented. We analyze a 16×16-element antenna with the designed radiating part,...
A dual polarization of patch antenna array for IEEE 802.11b/g/n MIMO applications are proposed and experimentally studied in this paper. The four by one patch antenna array printed on 300mm by 100mm by 0.8 mm FR4 substrate. The FR4 substrate is 2.5 mm above the metal ground plane. The patch array has two input ports for the orthogonal polarizations MIMO application. The measured efficiency and gain...
This paper presents a design of a quasi-millimeter wave wideband antenna array consisting of a leaf-shaped bowtie antenna (LSBA) and series-parallel feed networks in which parallel strip and microstrip lines are employed. A 16-element LSBA array is designed such that the antenna array operates over the frequency band of 22–30GHz. In order to demonstrate the effective performance of the presented configuration,...
Results of further reduction of mutual coupling between Wang-shaped patch antennas are presented in this paper. Two methods were investigated: offset elements arranged in a rhombus lattice and that added with shorting posts. The posts are erected around each patch but not connected to the patches. To validate the methods, two planar 2-by-2 subarrays were designed and fabricated. Measurements agreed...
A novel estimation method for direction of arrival angle is introduced. A compressed sensing technique is applied to this application. The resolution of the proposed method is superior to conventional methods such as the MUSIC. Furthermore, we show that the performance can be enhanced when the source signal is multi-band.
The beam forming at millimeter-wave for commercial standards like IEEE 802.11ad, is drawing much attention recently. Despite its advantages of high gain, beam-steering capability, and wide spatial coverage, phased-array requires power-hungry and costly multiple channels, especially in large-scale array systems. Thus, it becomes crucial to develop low power and compact circuits for the systems to be...
This paper presents a dual-polarized switched beam antenna that is used for small base station in LTE environment at frequency 2.6 GHz. The proposed antenna has three layers with square patches and C-shaped slots in symmetrical arrangement. It is fed through two ports simultaneously using switched line phase shifter. The antenna array provides three-beam switching in both horizontal and vertical plane...
We have proposed to place an RF circuit and an antenna on each side of a silicon chip in the 60 GHz band, respectively, and to connect between them with low loss by a coaxial-line structure using a hole opening in the chip. In this paper, we fabricate a 2×2 circularly polarized patch array in an area of 5 mm square on a silicon chip and have coaxial-line connection with a separated quadrature oscillator...
In this paper, we design a dual-polarization corporate-feed waveguide 32×32-slot array antenna for 120 GHz band in order to increase the operating frequency band and the gain. As a result of the simulation by HFSS, the bandwidth for VSWR less than 1.5 at the design frequency of 125 GHz is 7.6% (S11) and 8.8% (S22), respectively. The isolation is more than 50 dB over the above bandwidth. The simulated...
This paper presents a novel broadband unidirectional circularly polarized (CP) monopole antenna. The proposed antenna, which is based on traveling wave excitation, is compact in size and simple in structure. It consists of a ground plane, a probe, and an L-shaped strip. A 4×4-element array on low temperature cofired ceramic (LTCC) for the 60 GHz band is also presented. Simulation results of the antenna...
Without the need of active switches, a heterogeneous integrated retrodirective/beam-switching phased array is proposed in this paper. Its topology is complementary to the one we proposed in the literature. With left-handed synthesized transmission lines in microstrip form, the current version can behave identical to a reflection-type retrodirective array in the lower band, but automatically turns...
Recently, the direction-of-arrival (DOA) estimation using an array antenna has been studied extensively. Accordingly, array calibration method has also become an important topic. Conventional data acquisition methods often require a positioner or an azimuth table to make sources of known DOAs for pre-measurement of array calibration in a radio anechoic chamber. However, such a measurement is both...
Radar for estimating living-body direction has been studied, recently. However, the calibration of the array antenna is required since the phase error in the array antenna causes angle error in the estimated direction. In this paper, a simple calibration method that uses the channel response with known subject direction is presented. The experiment showed that the proposed method can calibrate the...
This paper investigates the mutual interactions between MIMO antenna radiation and multipath characteristics to obtain useful knowledge that can be employed in the design of a three-dimensional OTA system. In investigating factors that may affect the MIMO channel capacity, we focus on two key parameters, the incident wave power distribution in the elevation direction and the radiation pattern of terminal...
3D-MIMO, which utilizes 2D array antennas with vertical and horizontal elements, has drawn much attention for its ability to increase the capacity of mobile communication systems. The channel properties of azimuth direction have been investigated; however these of the elevation direction have not been reported enough. We therefore investigate elevation directional channel properties at a base station...
This paper proposes an analog-digital hybrid eigenmode transmission technique for massive short-range MIMO, which utilizes both analog and digital beamformings. In this method, first, a channel matrix in a plane-symmetrically configured MIMO array is block-diagonalized by analog beamforming with hybrid couplers. Then, eigenmode transmission is virtually realized by digital beamforming toward each...
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