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A low-profile, small-size (10 × 40 mm2 on a thin dielectric substrate) planar LTE/WWAN antenna suitable for slim laptop computer applications is presented. The antenna is formed by a coupled-fed loop and a reconfigurable circuit element. The reconfigurable circuit element is substantially positioned at the current nulls of the two higher-order resonant modes of the coupled-fed loop, thereby altering...
By introducing a meander T-shaped feeding strip, a planar LTE/WWAN monopole antenna with eight-band operation is proposed for 4G tablet computers. The impedance bandwidths across dual operating bands approach 297 / 1323 MHz at the LTE / WWAN bands, respectively. The proposed planar monopole antenna has the antenna size of only 375 mm3. The measured peak gains and antenna efficiencies are approximately...
This paper presents the analysis of CPW-fed trapezoidal monopole antenna added with parasitic elements and slot. The U slot applied on trapezoidal patch to investigate the effects of slot geometrical altering to the notch and operation frequency.
This paper presents a preliminary investigation on the body proximity cross-polarization properties considering the human walking motions for BAN on-body wireless communication systems. A novel concept of the BP-XPR (Body Proximity Cross-Polarization Power Ratio) in on-body channel is defined, which has been quantified based on relative antenna locations and radiation gain of test antennas. The analytical...
This paper presents experimental performance of Optical Leaky Wave Antenna (OLWA) using waffle waveguide (WWG). The antenna is fabricated by silicon photonics technology to achieve high directivity gain leaky waveguide antenna with small perturbation parameter of WWG. Narrow beam and one-dimensional beam scanning is demonstrated by sweeping input wavelength of OLWA. The measured WWG performance is...
In the research project, a design concept of the mm-wave antenna array operating at 38 GHz is proposed by using a 64-element micorstrip patch antenna array. Theoretical and experimental study validates the design approach for the use of the Fifth generation (5G) wireless communication system.
This paper presents a three sectored beam-switching antenna which consists of dual-polarized antennas and a reconfigurable power divider. The proposed dual-polarized antenna composed of two metallic dipole elements with a microstrip line as an excitation source. The three-way reconfigurable power divider is achieved by four switches to control the signal flow and the impedance matching network. The...
In the paper, the design of MIMO antennas with three ports is proposed and investigated. The three monopole antennas are fed by 50-ohm mini coaxial cable lines. Three monopoles are located as the right, the middle and the left side of the top edge of the design. Two L-shaped strips protruded from the ground and four inverted L-shaped strips extended from the ground is introduced to the design for...
A novel co-planner multiple-input-multiple-output (MIMO) antenna system combined with decoupling structure for enhancing the port isolation between two antennas at penta Long-Term Evolution (LTE) bands 700MHz, 900MHz, 1800MHz, 2300MHz and 2600MHz operation in this paper. For compact single antenna, the design is used to building a single multi-band antenna with 75×18×1.6 . In the decoupling work,...
We proposed to place an RF circuit and an antenna on each side of a silicon RF 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. We fabricated a 2×2 circularly polarized patch array in an area of 5mm square on a silicon chip and had coaxial-line connection with a separated quadrature oscillator chip. However...
This paper proposes a millimeter-wave on-chip antenna designed for ISM band (61-61.5GHz) application using 0.15um pHEMT process. A measured impedance bandwidth for 10 dB return loss ranging from 60.57-61.17 GHz is achieved. By taking the advantage of high permittivity and low loss in the pHEMT process, the footprint of the antenna can be shrunk to 1.5×1 mm2 and the radiation efficiency can be up to...
We proposed a low profile surface wave antenna with directional beam using micro strip element. Proposed antenna can design at the desired resonance frequency by changing microstrip length L and width W. In addition, we proposed process of design the desired resonance frequency by using some formulas. Also, we designed the antenna having the resonance frequency of 10 GHz by using proposed method ...
In this study, technques of cross-polarization suppression for the coplanar waveguide (CPW)-fed monopole antenna with an asymmetric ground plane have been presented. By appropriately etching a notch and embedding a four-slot array in the ground plane, the horizontal current component of the ground plane can be efficiently decreased, thus suppressing the cross-polarized radiation at the broadside direction...
In this paper, a folded C-shaped monopole for WLAN/WiMAX USB dongle is proposed. The antenna is fabricated on FR4 substrate; the overall dimensions are 35 mm × 10 mm × 1.6 mm. The antenna portion is occupied by 10 mm × 10 mm, and the size of system ground is 25 mm × 10 mm. The C-shaped monopole consists of the left arm with longest length and the left arm. The left arm of the folded C-shaped generates...
Frequency selective reflector (FSR) is useful to actualize multi-band reflector backed dipole antennas. This paper investigates a suitable FSR element shape for the FSR backed dipole antenna forming sector radiation pattern, which is suitable for mobile base station antennas. Three element shapes, Gang Buster, Jerusalem Cross, and Square Loop are considered. Radiation patterns are calculated by the...
Shortened far-field gain measurement method had been proposed for one of gain measurement methods that does not require replacement of antennas and measurement of distance between antennas. In this study, the shortened far-field gain measurement method was investigated by the simulation of a patch antenna in 2.5 GHz band. Because this antenna is narrow bandwidth and measured distance is relatively...
The radiation characteristics of two embroidered wideband wearable slot antennas covering 3.1-10.6 GHz: Ultra Wide Band (UWB) with different yarn-spacing densities have been presented and compared with a same-size reference copper antenna. When a wearable antenna is fabricated by a conductive yarn, it is important to assess the level of loss in respect to the yarn-spacing density [yarns/mm]. Therefore,...
In this paper, a novel beam-forming system consisting of 16 subarray antennas, each containing four aperture-coupled patch antennas, is presented in smart wireless communication systems. Each of the subarray antennas was able to switch its beam patterns toward one of nine zones over a half space by adjusting the specific phase delay angles among the four antenna elements. Furthermore, when all subarrays...
Experimental investigations by have been done to understand co-channel interference characteristics between the small cells installed in indoor environments. However, there are a lot of complex situations in the arrangement of indoor small cells, so that it seems to be hard to build the general interference modeling through experimental results due to strong dependences on the environmental conditions...
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)...
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