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A circularly polarized (CP) UHF RFID tag antenna is proposed in this paper. This antenna is realized by a meandering cross dipole. The meandering structure of the dipole could adjust amplitudes and phases from the two orthogonal arms of the cross dipole such that a CP frequency would be generated by the mutually-orthogonal mode. Therefore, we can achieve CP operation from the tag. The maximum transmitted...
A high-gain and low-cost millimetre-wave patch antenna is presented. The designed antenna with a U-slot loaded on the patch is excited by a single mircostrip line. The impedance bandwidth of the prototype is ∲11.6% from 57GHz to 60GHz. The gain of 8.2dBi is achieved at 60GHz. This single antenna element yields advantages of high gain, good directional radiation pattern and low fabrication cost. It...
A new design of the dual-band monopole antenna with the strip-line topology has been shown in this study. The dual-band characteristics are achieved using several strip monopole radiators. A small planar inverted-F monopole antenna (PIFMA) is connected to the ground plane. The bandwidth improvement for the antenna is obtained mainly by modifying the geometrical configuration of the strip monopoles...
This study proposes a compact dual-band antenna for MedRadio band (401 – 406 MHz). Chip inductors are applied in meandering monopole and spiral slot antennas to achieve a compact design. The simulated E-field of the monopole antenna increases significantly due to the inductive loads. The resonance modes of these two radiation components form 404 and 437 MHz. The dimension of the proposed antenna is...
Ground antenna concept and its promising applications for handheld communication devices such as the smartphones and tablet computers will be presented. The ground antennas are formed by adding very-small-size radiating elements to combine with the device ground plane to achieve an efficient radiator for multiband/wideband operations. Recent advances in the ground antenna design are addressed. The...
In this paper, design of a cosecant squared beam collinear dipole array using genetic algorithm (GA) is presented. Cosecant squared beam provide flat power density and it have been mainly used for a radar and base station. The array antenna design using GA is not to require the calculation of derivatives and easy to deal in various variables. In this presentation, the cosecant squared beam collinear...
This paper presents a two dimensional (2D) Holographic Microwave Imaging Array (HMIA) technique for early breast tumour detection and demonstrates its efficacy using experimental data. The system is designed for operation at a single frequency of 12.6 GHz, which includes one transmitter and an array of 15 receivers that is placed at a far-field under the breast phantom. The breast phantom consists...
This work presents a sub-terahertz wireless communication system design that uses a G-band 0.17THz electromagnetic waves. The key components of subharmonic mixer (SHM) with planar Schottky diode and high performance 170GHz MEMS rectangular waveguide filters are demonstrated. The simulated optimum conversion loss of the 170 GHz SHM is 8.35 dB, and the MEMS rectangular waveguide filters have been fabricated...
This paper presents a novel rectifier with a considerably expanded operating input power range for wireless power transmission (WPT) applications. By utilizing a depletion-mode metal-oxide-semiconductor field-effect transistor (MOSFET), the diode's breakdown voltage can be enlarged while preserving the same threshold voltage. Therefore, compared with traditional rectifiers, this proposed rectifier...
In this paper, a novel pyramidal shaped antenna configuration for two-dimensional direction-of-arrival estimation is presented. The proposed antenna consists of four sub-arrays and a top antenna for phase reference, and uses four antenna elements in DOA estimation with 4-channel receiver. The performance of 2D-DOA estimation based on sub-arrays of the proposed antenna under LOS environment is demonstrated.
In this paper, the design of unbalanced fed 180° phase shifter with a wideband performances is proposed. This phase shifter uses a single dielectric substrate, and consists of multi-section Wilkinson divider, reference line, and phase inverter containing balanced-unbalanced transition in the input and output port. The simulated and measured results show that this device provides 180° phase shift with...
Microwave imaging techniques for breast cancer detection have attacked many research groups recently. The key element for the microwave imaging system is the antenna. In this paper, a small flanged open-ended rectangular waveguide antenna (ORWA) is proposed for breast cancer detection. WR 62 waveguide which has cut-off frequency of 9.5 GHz is used in the design process. A 16-element antenna array...
This paper presents a circularly polarized slot-loop antenna excited by a dual-feed mechanism using metamaterial line. Wideband performance was achieved using slot perturbation in conjunction with dual feed. Return loss and axial-ratio bandwidths were measured as 86% and 36%, respectively. Bidirectional radiation was observed with a gain of 4.9 dBic.
A wideband circularly polarized antenna based on dual-polarized magneto-electric dipole antenna is proposed. After connected to a broadband 90° phase shifter and a Wilkinson power divider, the proposed dual-polarized antenna achieves circularly polarized (CP) radiation. This CP antenna exhibits a wide impedance bandwidth of 89.7% from 1.23 – 3.23 GHz with SWR ≤ 2 which covers the whole 3-dB axial-ratio...
A new 60-GHz dense dielectric (DD) patch antenna composed of a aperture coupled rectangular DD patch antenna and two annular reflectors is proposed. The antenna is totally designed onto printed circuit board (PCB) substrates, which is low-cost and easy to fabricate. A wide impedance bandwidth of wider than 30.8% for |S11| < −10 dB from 50 to 68.2 GHz is achieved. Stable radiation patterns with...
An ultra-wideband (UWB) bandpass filter (BPF) with notched band and wide stopband has been designed, fabricated, and discussed in this work. The proposed UWB BPF is constructed on the basis of microstrip/slotline transitions, which can be used as the feeding structure to provide strong coupling for wideband BPF. The fabricated BPF has good in-band performance with a notched band centered at 8.0 GHz...
A dual-loop antenna is proposed to enlarge the interrogation zone of reader antennas used in near-field ultra high frequency (UHF) radio frequency identification (RFID) systems. The dual-loop antenna is composed of two segmented loos with one common side and a double-sided parallel-strip line feeding network. Each loop has a uniform and single direction flowing current itself. By providing reverse-direction...
Time reversal of electromagnetic waves exhibits temporal and spatial focusing. This unique characteristic has found potential applications to information transmission and processing. This paper simply gives an overview on spatially super-resolution focusing of microwaves from the computational electromagnetic laboratory of the UESTC in recent years, primarily emphasizing on super-resolution focusing...
To realize efficient solution of complicated multi-scale conducting objects, non-conformal, non-overlapped integral equation based domain decomposition method (IE-DDM) is developed. Based on Robin transmission condition, the normal continuity of surface currents on non-conformal touching faces is maintained. Different fast solvers like multilevel fast multipole algorithm, adaptive cross approximation...
This communication presents a novel and simple circularly polarized (CP) antenna constructed by an elliptical cavity and a dipole exciter for 60 GHz wireless personal area network (WPAN) applications. The simulated 3-dB axial ratio (AR) bandwidth is 27.1%, from 51 to 67 GHz, in which the standing-wave ratio (SWR) is kept below 2. Meanwhile, the broadside gain is varied from 5 to 10 dBi.
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