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This paper has proposed a novel control scheme for the adaptive interference cancellation system (AICS) based on the automatic gain control (AGC) technique, analyzed the steady-state characteristics of the AICS and derived the expressions for the residual interference power (RIP) and the interference cancellation ratio (ICR). Furthermore, an experimental platform has been set up to test the performance...
In this paper, the channel measurements for 5th generation mobile networks (5G) potential spectrum at 3.35 GHz, 4.9 GHz and 5.4 GHz have been performed in the urban macro cell scenarios in China. The measured cases include line-of-sight (LOS) and non-line-of-sight (NLOS) propagation. After acquiring the channel impulse response from the measurement data, the empirical log-distance path loss models...
A microstrip spiral antenna with sharpening and a bi-conical over sleeve antenna have been proposed for noninvasive superficial layer breast cancer and invasive breast cancer thermotherapies of deep-located breast tumors, respectively. Some measured results are obtained by comparing results of the microwave equivalent phantom model and the swine. A process for the breast cancer treatment is also proposed...
A low profile internal wideband multiple-input-Multiple-output (MIMO) antenna for mobile phone application is presented and discussed in this paper. The proposed MIMO antenna consists of two symmetrical antenna elements fitting in two no-ground regions of 15×25 mm2 on the system ground board. The impedance matching covers two wide operating bands of 824–960 and 1710–2690 MHz for seven bands WWAN/LTE...
The compact wideband circularly polarized (CP) hollow dielectric resonator antenna (DRA) with an embedded vertical feed network is investigated. A printed quadrature hybrid coupler is used as the feed network. Since the footprint of the feed network is small, the design can be very compact. For demonstration, a hollow cylindrical CP DRA was designed at ∼2.4 GHz for WLAN applications. The reflection...
In this paper, the effect of radiation performance of antenna array in confined space on the field coverage is analyzed. In order to find the suitable radiation pattern that can give smoother wave coverage in confined space, a simple but efficient numerical method based on the parallel FDTD method and point source array approximation is presented. The current on each array element is obtained from...
A dual-broadband printed MIMO antenna is proposed and studied. The MIMO antenna system consists of two dual-broadband antenna elements. Each element has two monopoles leading to a broadband performance. Also in order to improve the isolation, a U-shaped slot and several T-shaped little ground branch are added. The measured results show that the bandwidth(return loss > 10dB) achieved for the dual-broadband...
A two-element series-fed metamaterial rectangular microstrip array of broadband and high-gain is proposed, designed, and fabricated. Arranging metamaterial patches to a series-fed array shown is demonstrated to have significant improvement of the antenna performance in terms of bandwidth broadening and gain enhancement. The array also inherits the high efficiency and low loss advantages of the metamaterial...
This paper presents an internal printed antenna design for handset application. This new design occupies only a compact dimension of 15×50 mm2 on the system circuit board. The operating bands cover 698–960 MHz and 1710–2690 MHz which include eight bands (LTE700/GSM850/900/DCS1800/PCS1900/ UMTS2100/LTE2300/LTE2500) for smart mobile application. Details of the antenna design, simulated and measured...
Metamaterials represent a type of artificial electromagnetic materials and/or structures of unique electromagnetic characteristics that cannot be observed in nature materials. These characteristics, such as negative refraction, negative group velocity, band gaps and so on, hold good promise in practical applications. Metamaterial research still fails, however, to reshape the microwave industry due...
From applications of high-impedance surfaces, TM surface wave pass-band below TM band-gap was found, and for periodic artificial surfaces without a band-gap, a similar phenomenon can be found below the leaky-wave band, which form the primary discovered special features in the present research work. A novel type of surface-wave antenna based on artificial surface was built, the antenna, which has wide-band...
In this paper, an improved hybrid antenna comprising of a quarter-wave monopole and a dielectric-resonator antenna of two cylindrical cavities is proposed, optimized, designed, fabricated and measured. Through the physical insight of antenna properties via the surface current distributions along the monopole and also the E-field vector distributions inside the dielectric-resonator antenna configuration,...
A novel rectangular patch antenna was specifically designed using planar-patterned metamaterial concepts. The patterned metal patch and finite ground plane form a coupled capacitive-inductive (C-L) circuit of negative index metamaterial. For the wideband, high efficiency, low loss and low VSWR, the novel type of antenna is used to design meta array, the array still have bandwidth significantly broadened...
Field uniformity of our developed reverberation chamber is investigated at calibration stage. The influence of the transmit antenna and the work volume is analyzed and evaluated according to the measurement data. Calibrations with different transmit antenna positions, directions, heights, and dimension of work volume are measured carefully. Field uniformity is analyzed in detail. It is indicated that...
In this paper, we present a novel microstrip patch antenna specifically designed using planar metamaterial patterned substrate. It is developed based on an ordinary patch antenna, and isolated triangle gaps and crossed strip-line gaps are etched on the metal patch and ground plane respectively. This patterned substrate was demonstrated in literature to have left-handed characteristics. In this way,...
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