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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 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...
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...
Multi-input multi-output (MIMO) transmission with multiple antennas, which performs parallel transmission at the same time and frequency and enhances the channel capacity, has attracted attention. In the case of small mobile terminals, the limitation of spaces for the multiple antennas leads to degrade the improvement of the channel capacity in proportion to the number of the antennas. This paper...
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...
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...
Intruder detection method by using time variant Multiple Input Multiple Output (MIMO) channels was proposed (MIMO sensor). It was verified that the antenna height and element spacing suitable for the MIMO sensor by the measurement. It was also shown that 2 × 2 MIMO sensor obtains the higher detection performance compared to 1 × 4 SIMO sensor. However, we conducted only the measurement when considering...
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...
We are developing a far field gain and an antenna factor estimation method for EMI broadband antennas using the amplitude center distance and time frequency analysis technique. Our method is using an amplitude center modified Friis transmission formula. In this paper, we show the measurement results of far field antenna factor of log-periodic dipole array antenna on an open area test site. In the...
Circularly-polarized 2-by-2 antenna arrays based on the complementary source concept are designed for millimeter-wave applications at 60 GHz. Each antenna element consists of a slot and an electric dipole. Energy is coupled from a microstrip feeding network to the slots. Each slot radiates and simultaneously excites the dipole, achieving a complementary source. Two arrays are presented to demonstrate...
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