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An X-band FMCW sensor is developed with beam-scanning capability to reliably detect the vehicles with different shapes. Two-element transmitting antenna array is designed with single phase shifter and an unequal power divider to reduce the cost and achieve compact size of 4.5 cm × 4 cm. Experiments successfully confirm precise identification of the incoming vehicle and its occupancy.
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...
In this paper, we propose and design a coaxial-line fed slot array with a waveguide-to-coaxial transition using a crank-shaped slot. We analyze the 8×8-element trapezoidal array with the designed transition. The bandwidth for VSWR less than 1.5 is 2.1% in the waveguide for boresight radiation and 2.0% in the waveguide for tilted radiation from 77 to 81 GHz.
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 passive remote sensing, the modified Stokes parameters (watt/m2) are defined in terms of electric fields (V/m) at a specific frequency, which is related to the brightness temperatures. However, brightness temperatures are defined by multiplying the specific intensity watt/m2/Hz/sr) by λ2/κ. In this work, the inconsistency of units in brightness temperatures are resolved by comparing a time-harmonic...
The electromagnetic wave propagation over sand and dust storm (SDS) is modeled by applying the parabolic wave equation (PWE). The attenuation and phase shift induced by air molecules and dust particles are simulated with an effective refractivity profile.
A 94 GHz two-dimensional (2D) millimeter-wave beam-scanning network using low temperature co-fired ceramic (LTCC) technology has been proposed. It utilizes two Butler Matrixes, four 3-dB directional couplers and four phase shifters to provide eight groups of phase difference on one dimension and four groups on another dimension. Combined with 2×4 SIW slot antenna array, it can achieve eight beams...
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.
A novel Dual Composite Right-Left Handed (D-CRLH) resonator is proposed in this paper. This type of the resonator is frequency-independent and formed by using the interdigital capacitor and wire inductor. Compared with the conventional half-wavelength resonator, this type of the resonators is much smaller with nearly 1/20 guided wavelength (λg). Moreover, by combining the proposed equivalent circuit...
Recently, the next generation (5G) mobile communication system has been actively investigated all over the world, in order to satisfy the strong demand for the faster and larger data communication. not only UHF band but also SHF/EHF bands have been much attracted much attention. Therefore, frequency characteristic of radio propagation loss must be studied. We previously investigated the outdoor to...
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 RF wireless communication systems, oscillator plays the role of providing signals, therefore high stability and low phase noise oscillator is very important. This paper use the negative resistance theory of FET, let the circuit is in an unstable state. And the use of dielectric resonator (DR) as a signal source, design of the dielectric resonator oscillator (DRO) operating frequency is 10.5GHz...
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...
Differential-signal transmission performances good noise immunity and low EMI characteristics benefiting from its symmetry architecture. While asymmetry occurs in the differential architecture due to process or other imperfect factors, these advantages forfeit and would cause more bit error rate to the communication system due to skew or mode conversion. In order to interpret the phenomenon and physical...
In this paper, a new low-pass filter (LPF) using defected ground structure (DGS) with wide rejection bandwidth has been presented in this work. Compared to the conventional DGS filter with cascade form, the proposed LPF is more compact in the same operated frequency. To provide a good band-stop characteristic, the modified horn-shaped slot and a pair of the modified arc-head slots are embedded inside...
We have calculated the induced electric field strength in various human models exposed to wireless power transfer (WPT) system operating in kHz-band frequencies, and investigated the distance characteristics of coupling factor. The coupling factor is a factor which represents the relationship between induced electric field in the human model and incident magnetic field strength. The numerical results...
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