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In this study, we propose a very simple and easy-to-fabricate transition from a low loss ground coplanar waveguide (GCPW) with sidewalls to rectangular waveguide. It consists of two steps of transition, one from an ordinary CPW to GCPW with side walls, and the other from GCPW to rectangular waveguide. Since the design is very simple and the features are aligned with the Cartesian coordinates, it highly...
A coplanar wave guide (CPW) fed semicircular slot antenna (SSA) with step impedance transformer is presented. Omni-directional radiation pattern in whole band with theoretical gain of 3 dBi with variation of plusmn0.5 dB is achieved. It has shown that this design of SSA gives experimental bandwidth of 10.7 GHz for VSWR < 2. Present results show suitability of structure for UWB communication.
A new concept of coplanar waveguide (CPW) exciting of mm-wave slot antenna has been presented. The antenna feeding is ensured by the coupling from the coplanar line to the slot radiating element via an inductively excitation located within the ground plane to which the coplanar line is connected. Simulated results show good performances in terms of bandwidth and gain at 60 GHz. Through the adjustment...
Due to the development of micro-mechanical systems (MEMS), RF MEMS switches are being widely investigated. Although RF MEMS switches have been intensively studied, limited work was done on switches that are suitable for integration in large switching networks such as switch matrices and multi-bit phase shifters. These switching networks require very small switches each with independent controls. Their...
The design of a Ka-band coplanar waveguide slot-coupled patch antenna ESA with integrated MEMS phase shifters has been described above. The incorporation of MEMS phase shifters into the ESA design results in a compact, efficient uplink mechanism for a future Army satellite communication system. A control board for biasing the phase shifters and initiating beam steering will be incorporated into the...
Recently, a novel global optimization technique, Taguchi's method was introduced to electromagnetic (EM) community and successfully has applied to optimize some EM applications such as linear array synthesis, ultra-wideband (UWB) antenna, planar filter designs, which demonstrated its great potential on optimization and its advantages of solving complex problem ability, good convergence, and easy coding...
An optimized 1 times 4 Chebychev Tapered Slot Antenna (TSA) array designed for wideband applications has been developed. Tapered slot antennas were utilized as the array elements and optimized to have a compact size. A one to four wideband power divider was designed and fabricated to compose the feed network for Chebychev TSA antenna array. Measured results of the proposed Chebychev TSA antenna array...
A compact and planar dual-antenna structure is reported which combines a printed monopole and a half-slot antenna to provide dual polarization. Different excited current modes are utilized to obtain low mutual coupling between elements. A prototype is fabricated and the measured results are presented. Relative bandwidth of 23.5% and isolation of better than 23 dB are achieved.
In this paper, a very low loss CPW structure for application in submillimeter wave region is proposed and an optimized solution in terms of loss and dispersion is obtained. In this new structure, substrate is removed totally, which allows a pure TEM wave propagation. Furthermore, using the side walls in the structure, there are no higher order substrate mode excitations. The only remaining source...
Broadside coupled coplanar waveguides are used to realize a composite right/left-handed transmission line, which is characterized by antiparallel group and phase velocities. The transmission line design depends on the electromagnetic coupling between coupled lines. The broadside coupled coplanar waveguides was chosen to achieve tight coupling with practical dimensions, which reflects an enhancement...
A method for characterization of on-chip antennas operating at millimeter-wave frequencies is presented in this paper. The test antenna is a dipole excited by coplanar strips and fabricated in low cost CMOS process. The radiation pattern and gain of the antenna is measured using a probe station and a vector network analyzer thus benefiting from calibration techniques that de-embed the effects of probes...
A novel CRLH cell is hereby presented providing easy integration and reconfigurability. First, the straight access line to the interdigital-capacitor was replaced by a bent access to improve the propagation without using cumbersome tapered access. Second, a stub-capacitor was added to facilitate the reconfigurability providing added degree of freedom for the values of the circuit model. These modifications...
This paper presents novel printed array antennas fed by CPW (coplanar waveguide) configuration with a corporate feed line on single layer that will be used to form an agile focused beam for the 60-GHz radio. This type of coupling eliminates the competition for surface space between the antenna elements and the feed network. Besides, the ground plane shields the antenna half-space from spurious radiation...
In this paper, we explore the idea of designing wideband BPFs by utilizing two identical wideband antennas. The tapered slot antenna is used for this purpose. In the proposed filter, two compact tapered slot antennas with CPW feedlines are connected in the face- to-face configuration to construct a BPF. The success of the proposed concept is demonstrated via full-wave electromagnetic simulations.
The new antenna, described here, can be reconfigured to operate efficiently over a total 7 dB return loss bandwidth from 460 MHz to in excess of 12 GHz. The antenna is based around a CPW-fed monopole featuring an elliptical base. Reconfiguration is achieved by switching the ground plane shape between convex and concave. The use of a concave ground plane, improves the impedance match throughout the...
The design of a bowtie slot antenna motivated by a hybrid with a quantum dot mode locked laser (QD-MLL) is presented. For the better performance, a matching network is designed to enhance the delivered power generated by the quantum-dot mode locked laser chip. The transferred power is shown to be improved by around 5 dB. The entire design and detailed results are presented to prove the validity of...
This paper proposes a dedicated characterization technique based on textile microstrip line measurements for determining the textile substrate's permittivity and loss tangent. The two-line method was applied to different textile transmission line configurations for calculating the effective permittivity and attenuation. Large deviations on the permittivity as a function of frequency were found due...
In this paper, a novel reconfigurable bandpass filter based on defected ground structures has been presented. The filter consists of two basic elements. The first is the inductively coupled resonator giving the bandpass filter response, and the second is the novel DGS cell allowing reconfigurability and miniaturization. Simulated and measured results are in good agreement. The flexibility of the design...
A unique design of series-fed grounded coplanar waveguide (GCPW) patch arrays for use in retro-reflective arrays is presented. For the current application, a planar retro-reflector which is capable of providing large radar cross-section (RCS) and signal modulation, and can also operate on metallic surfaces from 25.5-26.5GHz is desired. Linear, series-fed GCPW patch arrays are employed as the radiating...
This paper describes a technique to improve the linear dynamic range of a near-field (NF) imager based on the modulated scatterer technique (MST). The potential of achieving a better dynamic range at the receiver is investigated by eliminating the carrier on which no information is transmitted. This enables us to increase the amplification gain to obtain better signal-to-noise ratio (SNR) and more...
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