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This paper presents a compensation of variation effect of antennas for stepped-frequency radar identification systems. The antenna effects due to the variation in the antenna response and the mutual coupling degrade the target response in the identification systems. The equation used to reduce the antenna effect is derived. The simulations are demonstrated to validate the benefit of the compensation...
The multiple input multiple output (MIMO) sensor utilized for human detection by channel state information in a MIMO propagation channel has been proposed. In this paper, we evaluate the estimation of the detection of the person and the approximate direction of arrival (DoA) of the person using a correlation function with only 2 by 2 MEMO configuration. We focus on the DoA estimation of the human...
A surface wave antenna with an antenna gain of 6.29dBi and an FB ratio of 16.7dB at 8.3GHz is presented. This antenna is vertically polarized and designed for unidirectional beam having a low-profile structure with a height of 0.098λ_0. This antenna is composed of a loop element and arrayed dogbone-shaped elements. The phase distribution of electric field radiated from both elements are analyzed the...
This microstrip dual-band bandpass filter consists of double open-ended resonators and dumbbells designed by using the concept of symmetry. Two transmissions zero appear by zero-degree feed position. The proposed bandpass filter is created to support WLAN applications at 2.45 GHz and 5.20 GHz, respectively. Both insertion losses are greater than −0.9 dB and the return losses are below −18 dB. The...
Antennas are important for digital data communication and radar applications. For various applications, special performances of antennas are required. In this paper various kinds of antenna, reflector antenna, phased array antenna, low profile antennas, and reconfigurable antennas, will be discussed for various applications.
A 433 MHz compact size balun that can transform a complex source impedance value to a complex load impedance value is demonstrated. The balun design is based on a coupled-line coupler balun. The simulation shows a good performance at 433 MHz operating frequency.
A planar implantable sensing antenna is designed for intracranial pressure (ICP) monitoring by utilizing the capacitive coupling principle with the use of two parallel rings. The overall dimensions of the sensor is 1×1×0.2 mm3. The sensor operates over the medical implant communication service (MICS) band and found to be effective in monitoring variations of pressure differences within the brain....
This paper presents the focusing characteristics of near fields radiated from multi-panel phased array antennas, where each panel of the antenna array is designed to focus its radiation in the antenna near-field region, for UHF-RFID applications. The cylindrical arrangement of panels creates a relatively symmetrical focusing region beneficial to the tag detection within a confined region of bio-medical...
This paper presents a heuristic UTD corner diffraction for an antenna problem. The proposed heuristic UTD corner diffraction coefficient and slope diffraction are developed from the original UTD solution. This proposed solution can deal with a finite size perfect electric conductor (PEC) configuration including edges and corners for any antenna problem. A half wavelength dipole above a square PEC...
This paper presents design of a varactor-loaded frequency-tunable ring microstrip antenna with reduced bias circuits. Two varactor diodes are mounted on square ring patch element fed by an L-probe to realize a frequency-tunable microstrip antenna. An L-shaped feeding probe is used to realize impedance matching of the ring microstrip antenna. Resonant frequency of the proposed antenna can be tuned...
In this paper, a frequency tunable Dual Band Inverted L Spiral Antenna (DBILSA) for Multiple Input Multiple Output (MIMO) mobile terminals is presented. Two different shapes of L-shape and spiral shape were combined to produce a dual band response. Varactor diodes were used to simultaneously tune the resonant frequency from 1900 MHz to 3100 MHz (in the lower band) and from 3300 MHz to 3700 MHz (for...
A fast 3-D ray tracing method based on image theory is presented. The proposed method defines reflection tubes and organizes them in a tree structure to treat images efficiently in a complex 3-D environment. The method can account for all possible rays undergoing multiple reflections and transmissions, and its predictions agree well with the measurements.
A compact log periodic antenna (LPDA) is presented in this paper. In this paper, a slotted second iteration of LPDA is demonstrated for size reduction that used for UHF digital TV band application. The proposed antenna operates from 0.5GHz to 1.5GHz for the reflection coefficient ≤ −10dB and maintain the gain of more than 5dBi. The antenna is designed on FR4 Epoxy dielectric substrate with the thickness...
The frequency selective surface (FSS) with ultra-wide passband performance and a sharp rejection near the side of the passband is investigated in this paper. The proposed cascaded FSS consists of a 2-D periodic array of square loop aperture (SLA) and an array of bandstop square loop (SL) with different period. Under different incident waves, the proposed second-order FSS and third-order FSS provide...
To determine E-field at a tip of probe for evaluating SAR (specific absorption rate) values of DUTs in saline solution, use of near-field transmit antenna factor (NF-TAF) of small dipole antenna is proposed. NF-TAF can be expressed in closed form by assuming hyperbolic sinusoidal current distribution. Also, it can be evaluated by measuring S parameters between two identical dipole antennas and dielectric...
The development of left-handed circularly polarized (LHCP) X-band printed antenna for microsatellite data communication is presented. The antenna which takes a circular shape with ellipse-shaped truncation is designed to resonate at the frequency of 8.2GHz with the minimum axial ratio bandwidth of 400MHz. The proposed antenna is deployed on a 1.6mm thick NPC-H220A dielectric substrate. The realized...
The important factors increased the efficiency of the antenna to support users in the current technology are necessary wide impedance bandwidth, high gain, and low back radiation. In this paper, the antenna composed of the curved strip electric dipole and the vertically-oriented short patch is presented. The measured impedance bandwidth of 60.9% (SWR<2) from the frequency range of 1.62–2.9 GHz...
This paper presents a slotted-rectangular patch antenna with proximity-coupled feed operated at dual band of millimeter-wave (mmV) frequencies, 28GHz and 38GHz. The antenna was built in multilayer substrate construct by 10-layers Low temperature Co-fiber Ceramic (LTCC) with 5 mils thickness each. The slotted-patch and thick substrate are configured to enhance the bandwidth and obtain a good result...
This paper introduces a Ku-band car-borne frequency modulated continuous wave synthetic aperture radar (FMCW SAR) system in order to acquire clear images in stripmap mode. The specification and the architecture of the system are provided to demonstrate the outstanding performance. The conventional range doppler algorithm(RDA) is modified to be suitable for the radar system equipped in an automobile...
This paper presents the development of dual-band patch antenna incorporated with split ring resonator (SRR) for Global Positioning System (GPS) and Wireless Local Area Network (WLAN) application. The antenna is composed of 3 layers of copper conductor flanking 2 layers of FR4 Epoxy dielectric substrate with the total thickness of 1.6mm and the dimension of 78.6mm × 48.4mm. The characterization shows...
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