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Within this paper four different surface finishes, as well as plain copper tracks, were investigated to evaluate their impact on insertion loss on Microstrip (MS) ring resonators. The selected surface finishes are electroless nickel immersion gold (ENIG), electroless nickel electroless palladium immersion gold (ENEPIG), immersion tin, and gold. All of the examined platings consist of a varying number...
A differential power divider based on the Defected Ground Structure (DGS) operating at S-Band is developed. A novel DGS structure is proposed and its performance in the power divider is analyzed using a 3D full-wave simulator. The DGS structure can eminently realize miniaturization by comparing the operating frequency with the one without DGS and the one using conventional DGS. The return loss of...
Reconfigurable RF filter in Software Defined Radio (SDR) receivers is a promising solution to reduce analog circuit size especially in case of multi-standard radio context. In this paper, a new approach to design tunable RF filters using dual behavior resonators (DBR) topology is proposed. This design methodology is performed to design an electrical tunable filter able to switch between UMTS, WiFi...
This paper presents the design and chararacterization of Radio Frequency (RF) Micro Electro Mechanical System (MEMS) based switchable low pass filter. The proposed design of the switchable filter is used in space applications for frequency switchability where electromagnetic spectrum can be effectively utilized. In this paper, RF MEMS Switches are used to achieve tunability between two frequencies...
The paper considers several spread problems, which take place in many microwave non-antenna devices (antenna feed lines, hybrids, filters, diplexers, LNAs, etc.) — parasitic radiation, “high-altitude” fields, crosstalk, grounding inefficiency. Near-field scanning has been used for their detection and then, for verification of their minimization. Some practical design rules have been discussed to avoid...
A broadside-coupled structure is used to build a planar bandpass filter with ultra-wideband (UWB) performance. The design is aimed at achieving a passband that covers the frequency range from 3.1 GHz to 10.6 GHz as required by the modern UWB indoor and outdoor communication systems. To achieve a wide upper stopband, a stepped impedance resonator is employed to suppress the harmonic responses outside...
Low pass filters with ultra-wide band rejection and compact size by using radial stub and proposed radial stub with transformer are investigated. The stopband skirt selectivity and stopband width of lowpass filter are improved through generation of multiple zero points using proposed new structures. The implemented low pass filters with cutoff frequency fc of 3 GHz demonstrates stopband rejection...
New design methodology for truly differential RF and microwave front-ends has been presented in this paper. Baluns are avoided using this design methodology, while achieving differential signaling for high noise immunity. A case study on an ultra-wide band RF front-end in the frequency band 6-9 GHz has been performed using the new design methodology, indicating that both wide bandwidth and high performance...
A single diode mixer with ultra high LO/RF and LO/IF isolation and having good conversion loss has been designed. RF and LO signals are applied through BPF and LPF respectively. The mixer operates in C-band. It down converts the block of frequencies (5.925-6.425 GHz) to a block of frequencies (3.7-4.2 GHz) by local oscillator of signal frequency of 2.3 GHz. The proposed mixer achieves the double balanced...
Layout design techniques are examined in order to reduce potential radiation loss of feed circuits. Hybrid mode method of moments (MoM) is used to characterize microstrip discontinuities such as bends, steps and T-junctions that are building blocks in a planar integrated RF feed. It includes frequency dispersion, radiation and leakage losses. The equivalent circuit of these elements can be obtained...
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