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In the 5G system, high frequency bands over 6 GHz (6–100 GHz) will be a key factor in providing a very wide bandwidth. Because of high path losses, these bands are considered to use for small cells. To design radio links with high accuracy and evaluate 5G system performances for various scenarios, channel characteristics must be clarified. In this paper, we clarify channel characteristics in an outdoor...
H-Plane substrate integrated waveguide (SIW) antenna made of textile for millimeter wireless body area network (WBAN) application is proposed. Three-stepped tapered matching structure was added to a coaxial feed for improving the impedance matching. The ground was extended to the antenna aperture to prevent the degeneration of radiation pattern by phantom. The extended arc shaped substrate improves...
Landslide monitoring is crucial for early detection of landslide hazard and reduce the risk of a landslide. In this work, a Ground-Based Synthetic Aperture Radar (GB-SAR) system intended for landslide monitoring has been developed. The system is used to cognize a point target located at a certain distance. This GB-SAR system consists of portable VNA module, SAR processor, stepper controller, linear...
Gain standards for accurate antenna measurements are expensive due to their extensive calibration procedure. This paper presents a concept for low cost antennas that comprise of sheets of FR-4 which are accurately manufactured using modern CNC technology. This accuracy in turn will render the calibration procedures unnecessary. The impact of tolerances is studied to determine whether the concept is...
An ultra-wideband TEM horn antenna with ridge is simulated and designed. The feed mode of the antenna adopts the form that the coaxial line is parallel to the radiation direction. By modeling and simulating in CST Microwave Studio® software, it can realize that the impedance bandwidth of |S11|< −10dB is 1‱30 GHz or more. Within this operating bandwidth, the antenna has directional radiation pattern...
These days it has been rapidly increasing the use of millimeter and submillimeter EM (electromagnetic) devices and systems in very broad industry and science fields. Free-space method using antennas is one of the popular methods suitable for measuring material parameters which are a prerequisite to design and to fabricate EM devices and systems used in millimeter and submillimeter frequency ranges...
For covering a specified wide circular area with a tilted sectoral beam, this paper proposes compact beam-tilted multimode horns based on coaxial dual-path guides and shaped dielectric-lens onto the horn aperture. We present two design examples with a beam tilted up to 20 degrees for 24 GHz radio-sensor systems. One is constructed with an axially symmetrical structure and also is fed by a bend waveguide,...
We have already proposed a single antenna method for estimating an antenna factor of log-periodic dipole array antenna at 10 m antenna distance up to 1 GHz. In this paper, we apply our proposed single antenna method for double ridged guide horn antenna. For estimating the far field antenna gain, we apply the antenna phase center modified Friis transmission formula. We show the estimation results of...
In this paper, a circular ring is used to excite exponential horn antenna presented for bridging outdoor wireless LAN applications. The advantage of this structure does not require a waveguide feeding system. The purpose of this antenna design is to achieve unidirectional antenna which is operated at the center frequency of 2.45 GHz (2.40 GHz to 2.484 GHz). The characteristics of the proposed antenna...
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