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MRF volume 10 issue 4 Cover and Back matter
MRF volume 10 issue 4 Cover and Front matter
Bandpass filters with + 1 transmission zeros using /4 resonator and /2 resonator
Di Lu, Xiao-Hong Tang, N. Scott Barker
The present paper presents a novel method to cope with the difficulty that an -order filter can introduce a maximum number of transmission zeros (TZs) ? no more than . The method is described by a coupling topology and realized by a regular fully canonical filter structure to increase one more TZ for an -order filter without any filter size increase. Besides, the TZ shift property, as another adva
An ultra-thin polarization independent quad-band microwave absorber-based on compact metamaterial structures for EMI/EMC applications
Naveen Mishra, Khusboo Kumari, Raghvendra Kumar Chaudhary
In this paper, a compact metamaterial inspired ultra-thin polarization independent quad-band microwave absorber for electromagnetic interference (EMI)/ electromagnetic compatibility (EMC) applications have been discussed. The proposed absorber structure offers four different absorption peaks having absorptivity of 97.02, 94.07, 91.72, and 98.20% at 3.40, 8.23, 9.89, and 11.80 GHz, respectively. Du
A metamaterial absorber based high gain directional dipole antenna
Sarin Valiyaveettil Pushpakaran, Jayakrishnan M. Purushothama, Manoj Mani, Aanandan Chandroth, Mohanan Pezholil, Vasudevan Kesavath
A novel idea for generating directional electromagnetic beam using a metamaterial absorber for enhancing radiation from a microwave antenna in the S-band is presented herewith. The metamaterial structure constitutes the well-known stacked dogbone doublet working in the absorption mode. The reflection property of the dogbone metamaterial absorber, for the non-propagating reactive near-field, is uti
Wideband high-efficiency linearized PA design with reduction in memory effects and IMD3
Xuekun Du, Chang Jiang You, Yulong Zhao, Xiang Li, Mohamed Helaoui, Jingye Cai, Fadhel M. Ghannouchi
An analytical method is proposed to reduce the memory effects and third-order intermodulation distortions for improving the linearity of wideband power amplifier (PA). An excellent linearity can be obtained by reducing the second-harmonic output power levels and reducing the envelope voltage components in the megahertz range. An improved wideband Chebyshev low-pass matching network including the b
Compact microstrip bandpass filter using dual closed-loop stepped impedance resonator
Salif N. Dembele, Ting Zhang, Jingfu Bao, Denis Bukuru
A dual closed-loop stepped impedance resonator (DCLSIR) is investigated and used in designing a compact microstrip bandpass filter (BPF). The proposed DCLSIR is symmetrical; as a result, the symmetric characteristics of the resonator have been used. The design equations are derived and used to support the circuit design. The center frequency, position of transmission zeros, and fractional bandwidt
Microstrip diplexer design based on two square open loop bandpass filters for RFID applications
Hafid Tizyi, Fatima Riouch, Abdelwahed Tribak, Abdellah Najid, Angel Mediavilla
In this work, a simple and efficient approach to design a microstrip diplexer is proposed. It is based on the combination of two compact Square Open Loop Resonator band pass filters. These filters are designed for Radio Frequency Identification application at 2.45 GHz frequency. Using the Chebychev approximation, the two filters and diplexer are designed, simulated, fabricated, and measured. The r
Longitudinal slotted waveguide array feed networks
J. Soleiman Meiguni, S. Keshavarz Haddad, A. Hosseinbeig
In this paper, two new feed network designs for single layer and double layer slotted waveguide array antennas are presented. A microstrip to substrate integrated waveguide transition is applied to the single layer antenna. The aperture coupling mechanism is used in order to find the optimum feed network for double-layer structure and to obtain stable radiation characteristics over the frequency b
Inferring the atmospheric duct from radar sea clutter using the improved artificial bee colony algorithm
Chao Yang, Lixin Guo
In this paper, an orthogonal crossover artificial bee colony (OCABC) algorithm based on orthogonal experimental design is presented and applied to infer the marine atmospheric duct using the refractivity from clutter technique, and the radar sea clutter power is simulated by the commonly used parabolic equation method. In order to test the accuracy of the OCABC algorithm, the measured data and the
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