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Substrate integrated waveguides (SIW) have attracted much attention in recent times. They present higher quality factor and lower losses for resonators than classical planar technologies, while maintaining low cost, easy manufacturing, small size, and integration with other circuits in the same substrate. Empty substrate integrated waveguides (ESIW) have appeared, decreasing losses by removing the...
For a very long while the interests of small size electronic systems have been expanding. Because of progressions in integrated circuits the physical size of system is reduced. As the interest for enhanced integrated systems increments and as the system moves to higher frequencies, microwave creator searches for the up and coming era of microwave materials with enhanced adaptability. There is likewise...
This paper reports the design of 50–60 GHz probe type waveguide to microstrip transition on LTCC substrate, which acts as an initial development towards integrated MMIC hermetic packaging in millimeter-wave systems. The transition shows a simulated return loss better than 15 dB and insertion loss less than 0.4 dB in back to back configuration. The measured insertion loss is 1.2 to 1.8 dB with return...
This paper presents a new design of dual frequency SIW slot antenna for Ku band applications. The antenna has been designed and simulated using HFSS 3D simulation software. Rogers/RT Duroid 5880 (tm) with dielectric constant ϵr=2.2 is used as substrate material and copper is used as metal plates of antenna. The proposed antenna can resonate at 12 GHz and 13.8 GHz with return loss of −15.4 dB and −27...
Shielded microstrip lines are widely used in microwave and millimeter wave systems to connect devices while protecting circuits from environmental contaminants, preventing electromagnetic interference, and enhancing the mechanical strength. To avoid the influence of the metallic enclosures on the fundamental mode, the choice of dimensions for the housing is an important issue. In this paper, the influence...
Gearing towards compact synthetic aperture radar designs for airborne and spaceborne applications, the effect of electromagnetic interferences in radar components is exemplified. Here, a new solution that improved RF isolation over classical Faraday cage is demonstrated, through the use of a carbon nanotube based cavity.
Circuits designed and fabricated on a transparent and flexible substrate is presented in this paper. The proposed circuits were designed to operate at 2.4GHz and fabricated on commonly used PVC material. Using double-sided parallel-strip line on power divider and branch line designs, we obtained good simulated and measured results within the frequency of interest.
Double-Y balun is a kind of printed balun with ultra wide bandwidth, which can also realize transformation from different sorts of printed transmission lines and has been widely used in wideband mixer and ultra-wideband antennas. This paper researched on some elements that influent the upper frequency limitation of double-Y balun in practical engineering and presented a design of double-Y balun transition...
This article presents a design of a compact T-shaped power divider implementing a ground-slotted technique operating at frequency band of 2 to 9 GHz. This designed power divider is realized by using Rogers 4003C substrate having the thickness of 0.508 mm with dielectric constant of 3.38 and 35 μm copper coating. The designed divider is simulated with commercially available CST Microwave Studio. The...
The design of a novel wideband microwave crossover is presented. The proposed structure is fully compatible with microstrip circuits as it is printed on one side of a single layer substrate. The structure is made up of a curved-edge microstrip patch with four fan-shaped slots symmetrically allocated inside the patch. The simulations show a crossover with more than 14 dB of isolation, less than 0.5...
The paper describes the fabrication process, the technology assessment and the experimental characterization of silver nanoparticle inkjet-printed microstrip structures on alumina substrates for RF and microwave applications. The present technology allows, through the adoption of innovative silver-based inks and a special piezoelectric-inkjet printer, the direct printing of microstrip prototypes on...
The family of tapered slot antennas (TSA), has good electrical performance including gain, relatively low side lobes, a circular symmetric main beam and practically constant impedance over a broad frequency band. Fabrication on thin, flexible substrates allows the TSA to be conformed over a given body, such as an aircraft wing or a piece of clothing for wearable network. Impedance matching is a major...
Multilayer circuit is essential for hybrid integrated technology. In this paper, a triple-layer transition of microstrip line to substrate integrated nonradiative dielectric waveguide (SINRD) is presented, of which the SINRD waveguide is fabricated directly on PCBs through air holes. Due to this integrated transition, the realization of hybrid integrated systems directly connected with planar circuits...
This paper proposes new design principles to reduce the radiation from microstrip impedance transformers using shunt-series networks, which are widely used and spread everywhere in modern microwave circuits. These new principles are developed based on a newly simplified analytical expression for the radiation from a microstrip line. The principles suggest that using dual shunt open stubs with low...
In this paper, design of the input and output matching microstrip circuits subject to the transistor potential performance is completed to meet an ultra-wide band front-end requirements. For this purpose, the performance characterization of a microwave transistor is implemented to design a microstrip amplifier so that geometry of all the matching microstrip elements on a selected substrate (W, ℓ,...
A new vertical transition is presented that enables the use of epoxy-resin (FR-4) substrates for multi-chip modules (MCM) at millimeter-wave frequencies. A short microstrip trace on an FR-4 motherboard is connected to standard WR-10 waveguide for integration with other system components (e.g. antennas). The microwave transition is accomplished within a small (3 mm by 4 mm) three metal layer miniature...
Wide band-stop filter on high-resistivity silicon (HRS) is introduced. The starting point is an ideal circuit model with ideal waveguides. The filter is simulated in microstrip technology and compared with the ideal model. The structure is adjusted to the conditions of silicon and technological boundaries.
In this paper, two classes of Ka-band Substrate Integrated Waveguide(SIW) power divider are presented and studied. The advantages of the SIW technique are its low profile, low-lost, mass-productive, ease of fabrication and fully integrated with planar circuits. All the modules are designed to be operated in a wide frequency range. The Y-junction shows a bandwidth of 29.4%.
This paper presents the design of microstrip to stripline transitions built on the same layer of substrate of a single LTCC wafer. To achieve this geometry a cavity is opened on the substrate layer just above the stripline removing the upper ground plane, morphing the stripline into a microstrip line. The main interest of these transitions is the ability to excite stripline circuits directly from...
In this paper, a new inkjet printed wideband 3 dB branch line coupler is presented and compared with the identical coupler circuit fabricated in the conventional etching technique. The coupler circuit consists of four γ/4 open circuited coupled lines in a suspended microstrip structure, a conventional squared loop circuit in a microstrip structure, and a transition between these two different transmission...
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