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A 60GHz-band compact-range wireless access system using a large array antenna can provide an uniform signal reception zone (less than 14 m distance from the antenna) and an almost multipath-free propagation environment. To evaluate the system performance, a wireless communication system for demonstration is constructed and the bit error rate (BER) and the signal-to-interference-plus-noise ratio (SINR)...
A circularly polarized (CP) mirror-integrated dielectric resonator (DR) antenna (DRA) is investigated. Beneath the mirror is a cylindrical DR, therefore it is effectively a two-layer DRA. The DRA is excited in its fundamental HEM11δ mode. To obtain a mirror, the glass slab is coated with a non-conducting film at its back. Since the film is non-conducting, the electromagnetic wave can transmit from...
This paper investigates a wideband dual-polarized rectangular dielectric resonator antenna (DRA). The DRA is simultaneously excited in its fundamental TE111 mode and higher-order TE113 mode to widen the bandwidth. Their degenerate fields are also excited to obtain a polarization diversity antenna. An overlapped bandwidth of 29.6% (2.88-3.88 GHz), antenna gains ranging from 4.8 dBi to 9.9 dBi, and...
Multi-band antenna elements consisting of a loop slot for lower-band and two slots for higher-band are designed for cellular base station antennas. This antenna is fed by Tri-plate line to eliminate feeding coaxial cables and connectors of feeding network circuits and its frequency bands are 0.8/0.9 GHz and 1.7/2.0 GHz. This paper discusses the design method of multi-band polarization diversity array...
This study proposes a simple self-calibration system that involves applying the phase-match method (PMM) in the far-field calibration of a deployed active array. An 8-element microstrip antenna array was applied to validate the proposed method experimentally.
Recently, the S-parameter method using a vector network analyzer was proposed whereby the differential input impedance of a balanced-fed antenna were obtained. To improve measurement accuracy of the S-parameter method, the dependence on thickness of the semi-rigid cable used for the measurement jig is obtained from the results of calculations using the FDTD method. Three types of jigs each made from...
An array antenna is composed antenna elements and feed circuit network, and different substrates are often used to suppress degradation of antenna performance. Conventionally, interconnecting structure such as connectors or jigs in order to connect these substrates to each other. ACP is suitable to connect antenna substrate and feed network. In this paper, a 16-element feed-circuit-integrated patch...
In Heterogeneous network, a number of small cells are distributed in conventional macro-cellular environments, in order to improve the communication speed. The interference between outdoor and indoor cells then becomes to be a significant problem, so that its propagation loss characteristics should be evaluated in outdoor- indoor propagation environments. This paper proposes a mathematical expression...
W-band T-junction and bifurcated substrate integrated waveguide (SIW) diplexers are proposed in this paper. Instead of conventional 0.127 mm substrate for W-band circuitry, a 0.254 mm substrate is chosen for Q-value improvement A WR-10 waveguide to 0.254 mm SIW E-plane transition is developed for measurement purpose. Two diplexers are implemented.
In this paper, a compact omnidirectional circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) is presented. The DRA is excited in its TM01δ mode by a probe located at the center, giving linearly polarized (LP) omnidirectional radiation patterns. Four interleaved strips serving as a wave polarizer are placed on the top of the DRA. By tuning the strips, the LP fields can be changed...
In order to evaluate specific absorption rate (SAR) of human exposure in vicinity of wireless power transfer (WPT) devices operating in intermediate-frequency band, we have developed a human-equivalent dielectric liquid phantom using a diluted solution with the 0.04 mol/l concentrations. The liquid phantom has the same conductivity and indicates similar EM characteristics with two-third of the muscle...
This work presents a dual-band high-gain metamaterial radome which can increase antenna gain. This radome operates at the WiMAX (3.5GHz) band and the WiFi (5.8GHz) band. The refractive index of this radome is designed to near zero. The radiation beamwidth of antenna becomes small and the antenna gain is increasing. The size of this radome is 90 mm × 90 mm. This radome improves antenna gain 2.6 dB...
A design of MIMO antennas using two monopole structures adding a neutral line connected to ground plane for achieving better isolation is proposed and examined. The antenna uses curved C-shaped arm to resonance the bands of IEEE802.11b/g/n; another arm extended on the feed achieves the bands of IEEE 802.11a application. The overall size of the design is 45×25×1.6mm3; the occupied area of the antenna...
Application of monopole antenna using by the magnetodielectric material strip is proposed. Antenna is with an operation frequency of 2.4GHz. It with reconfigurable radiation pattern is as function of the spacing. Strip also changes the antenna radiation pattern at different thinness, wide, height and it also increases the gain up to 2.34dB.
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