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A low profile monopolar patch antenna with conical beam radiation pattern and high gain performance is presented in this paper. The antenna has a simple structure which consists of a monopolar patch, a ground and a set of shorting pins. To enhance the gain performance, the antenna is designed to operate with TM03 mode and TM04 mode. The proposed antenna operates from 2.41 to 2.51 GHz for the VSWR...
Pseudo-lens structures for a fully integrated, stacked open-slot on-chip antenna design for the frequency range around 180 GHz are presented. Due to the use of the silicon substrate as pseudo-lens no reflector or external dielectric lens is required. The antenna is using the multi-layered IHP 130 nm SiGe BiCMOS technology (SG13).
This paper reports a 325–500 GHz antenna for terahertz applications. A novel highly integrated radiation structure including an E-plane flare and dual H-plane reflectors are proposed in the design for achieving high radiation gains. A terahertz horn antenna that is excited by using a standard WR2.2 waveguide is adopted as the primary feeder for the proposed antenna. To verify the design, a 325–500...
In this paper, we optimized the small lens for a slit dipole antenna to behave as a leaky-wave antenna. An extended hemispherical silicon lens was attached at the back side of a slit dipole antenna and the antenna gain and radiation pattern characteristics were investigated over a frequency range from 200 to 400 GHz. The numerical results show that the antenna gain responses exhibit a higher level...
This paper presents a novel array configuration which improves the accuracy for high-resolution direction of arrival (DOA) estimation using the concept of Khatri-Rao (KR) product. We extended the concept of two-level nested array and found a novel array configuration which has larger array aperture and more degree of freedom compared with that of the two-level nested array. The performance of the...
Miniaturization of radio frequency identification (RFID) reader front-end circuit based on low temperature co-fired ceramic (LTCC) is studied in this paper. LTCC makes the dimension of the circuit a reduction of about 30% which is compared with the traditional circuit substrate in ultra high frequency (UHF) band. It makes the size of RFID front-end circuit more compact than the traditional one.
The autocorrelation characteristic of Nakagami-m fading channel simulated by the original Inverse Method agree with the theoretical value poor because of the loss of phase information. An efficient method to improve the autocorrelation characteristic of the Inverse Method is presented adding the lost phase information of Rayleigh sequence during inverse transform process by symbol correction. Simulation...
Innovative complex root finding and tracing algorithms are applied to the analysis of losses in transmission line containing a thin graphene layer deposited on a silicone substrate. An equivalent transmission-line model of TM modes, which involves spatial dispersion of the graphene is considered. The root tracing scheme is modified to work effectively in complex space.
A novel framework to optimize the identification clustering of multipath scatterers in a MIMO wireless system is proposed. It is a comprehensive evaluation of major cluster identification methods across multiple categories of clustering methodologies. The reliability will be ensured with the use of a parameter selection framework utilizing the Bayesian Information Criterion (BIC). Statistical preprocessing...
In this paper, a study on a miniaturized broadband printed monopole antenna is described. The design integrates a printed bell-shaped monopole antenna with short stub. The antenna improve the impedance matching in the lower frequency band by attaching the short stub. The designed antenna operates impedance bandwidth of 3.1∼10.6 GHz. The radiation patterns of omni-directional are obtained over the...
This paper presents a pattern reconfigurable Multiple Input Multiple Output (MIMO) Half Shaped Cubical Antenna (HSCA) in user terminal. Two HSCAs were designed where a single HSCA is formed by combining 3 Planar Inverted F Antenna (PIFA) elements. PIN diodes are used to perform the pattern reconfiguration. All the 3 PIFA elements at both ports are operating at LTE-U band at 5.3GHz, 5.6GHz and 5.7GHz...
Recently, the wireless power transmission has been investigated for many applications such as capsular endoscope that exists for a long time in the body. They can reduce the burden of doctors and patients, on the other hand, they has the risk due to contain cell battery that might leak toxic substances. In this paper, we examine the way of wireless power transmission to a capsular endoscope by using...
A small embedded long-term evolution/wireless wide area network (LTE/WWAN) antenna integrated with the keyboard ground plane in a laptop computer is presented. The antenna is installed on a notched region (40 mm × 8 mm) of the keyboard ground plane. This antenna can not only be configured to have a compact configuration but also be designed to excite several resonant modes of the hinge slot between...
Antennas installed on various domestic appliances should be small and not influenced by the background metal. Small antenna metamaterial antenna chip developed by KIT EOE laboratory (MACKEY) is a composite structure consisting of a metal plate loaded capacitance grid realized using an artificial magnetic conductor (AMC) substrate and a dipole antenna. It can be installed on a conducting plate without...
Frequency dispersive phase shifter for a multi-band base station antenna, which is capable of increasing the communication capacity by deep tilt angle in the lower frequency bands, has been proposed. In this paper, in order to enlarge the amount of phase shift of the frequency dispersive phase shifter, we first derive the equivalent circuit of the unit cell of the phase shifter. A lossless symmetrical...
In this paper, an isolation technique between two closely stacked conventional Inverted-L antennas (ILAs) is proposed for canceling the induced coupling current between adjacent antenna structures. Two ILAs are sharing the common ground plane and oriented with the same polarization. To improve isolation characteristic, the Ground Well Structure (GWS) is inserted between two ILA layers. The GWS delays...
Reflection and radiation characteristics of a slot antenna backed by a half cylindrical cavity made of conductive textiles have been measured. Two conductive textile sheets and conductive threads configured a post-wall structure forming a cavity of a thin half-cylinder. The antenna was designed for the operation frequency around 2.45 GHz. The reflection and radiation characteristics were measured...
Imaging of the human body using ultrawideband (UWB) radar for security applications has numerous advantages over other approaches. Recently, low-cost radar systems have been intensively studied for this purpose, employing Doppler interferometry technology to image a single human target. The technique, however, has limitations when there is more than one target person in the scene. To resolve this...
A slim vertically polarized omni-directional feed circuit integrated loop slot antenna for mobile base station is proposed in this paper. Picocell antenna requires a compact and slim structure, because its construction space is limited in urban areas. The proposed antenna consists of loop slots and patches to improve omni-directional pattern and bandwidth. In order to enhance the directivity gain,...
In western Japan, the terrestrial digital TV waves have possibilities of influences by co-channel overreach interferences from not only Japan but also Korea. We have been observing the interferences based on our original measurement method using FM waves for identifying the interference of TV wave. In this study, we evaluated seasonal characteristics of overreach interferences from Japan and Korea...
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