A microstrip comb-line antenna is developed in the millimeter-wave band. When element spacing one guide wavelength for broadside beam traveling-wave excitation, reflections from all radiating elements are synthesized phase. Therefore, return loss increases significantly. Furthermore, re-radiation due to reflection wave degrades design accuracy required radiation pattern. We propose way improve characteristic of with arbitrary directions including strictly a direction. To suppress reflection,...

Single-layer slotted waveguide arrays consist of two parts, the slot plate and groove feed structure waveguides. The key difficulty in their mass production is realisation perfect electrical contact between parts. paper presents a single-layer circuit consisting T-junctions which divides an input power into all radiating waveguides alternating phase; it dispenses with principle. Experiments confirm design divider feasibility phase-fed array also demonstrated.

A 76-Gbit/s 265-GHz CMOS receiver (RX) modularized with a WR-3.4 waveguide interface is presented. It mixer-first RX fabricated using 40-nm technology. The primary design focus simplicity and the resulting low noise loss high conversion gain (CG). To allow for both on-wafer packaged measurements, ON-chip transmission lines are designed such that their characteristics relatively insensitive to presence or absence of adhesive covering chip. chip flip-chip-mounted on multilayer printed circuit...

A phased-array CMOS receiver (RX) module operating at around 260 GHz is presented. It combines a 1D phased array fabricated on printed circuit board (PCB) with mechanically steered antenna. In this system, due to chip size and antenna pitch constraints, down-converter chips are mounted in staggered arrangement against waveguide transitions arranged one dimension. The output signals from the combined by rat-race couplers, Wilkinson power combiners, transmission lines PCB. components for LO...

A hybrid two-dimensional (2D) beam-scanning lens antenna through the combination of a mechanical slide and phased array primary radiator is proposed. The proposed allowed for scanning main beam in one dimension by utilizing piezo motor to lens, while also enabling electrical radiators arranged orthogonal direction. effectiveness was demonstrated electromagnetic simulations fabricated measurements. We have shown capability perform 2D with scan loss approximately 3 dB over spherical angular...

A novel radiating element with a matching circuit was developed for comb-line antennas of traveling-wave operation. In the design low-sidelobe array antennas, large coupling is required elements antenna around input port. Furthermore, arrays, whose number small, also require because radiation power each assigned to be much larger. However, wide perform poor impedance characteristics and radiate cross polarization. Thus, we proposed stub in parallel realize strong power, low reflection,...

A high-gain and high-efficiency slotted waveguide planar antenna is developed in the millimeter-wave band. Forty-five degree inclined polarization required for automotive radar systems. In design of array arbitrarily linear polarization, slot spacing one guide wavelength which larger than a free space. Consequently, grating lobes appear radiation pattern. So, we composed post-loaded narrow-wall slots single-layer alternating-phase feeding circuit. with suppressed has been fabricated its RF...

The resonant mode of the wireless power transmission system is discussed to unveil a mechanism transmission. We have analyzed electro-magnetic resonance phenomenon by using MoM calculate input impedance, port currents, efficiency, and near field distribution. checked that has two frequencies, efficiency maximized at those frequencies. magnetic distribution proves different modes. also considered far find higher frequency better for its high low undesired emission.

A two-dimensional transmitting coil array is used to expand receiving area in wireless power transfer with magnetically coupled resonance and the effect of discussed this paper. The has more than one resonant frequency due mutual couplings between coils. Therefore, we propose a method designing keep high transmission efficiency wider area. computer analysis shows improvement proposed method.

A millimeter-wave transition from a waveguide to two microstrip lines and the design methodology are proposed. rectangular patch element in short-terminated is analyzed by cavity model of antenna dyadic Green's function waveguide. The analysis points out that has an optimum width for wideband, which only broad wall also works as divider. numerical investigation having validates analytical terms indicates distance between length suppressing higher order modes. prototype exhibits insertion...

Metamaterial is an artificial material in which the effective phase constant can be controlled by internal physical periodic structure of transmission line. Effective designed to any value, may small, large, approximately zero, or negative, attained changing dimensions structure. Miniaturization antenna and wide design flexibility radiation patterns expected from use metamaterials. In this work, we developed a leaky-wave slot-array on variable stub-loaded left-handed waveguide. The pattern...

5G, the next generation of wireless communications, is focusing on modern antenna technologies like massive MIMO, phased arrays and mm-wave band to obtain data rates up 10 Gbps. In this paper, we have proposed a new 64 element, 8×8 series fed patch array, for 28 GHz, 5G mobile base station antennas. The array steers its beam along horizontal axis provide coverage users in different directions. contains eight 8-element arrays. designed such way that it shows mixed standing wave travelling...

Broadband and planar microstrip-to-waveguide transitions are developed in the millimeter-wave band. Novel printed pattern is applied to microstrip substrate ordinary back-short-type transition operate over extremely broad frequency bandwidth. Furthermore, order realize flat which does not need back-short waveguide, designed multi-layer substrate. Both fabricated their performances measured simulated

This paper presents a design technique to achieve broadband planar microstrip-to-waveguide transition in millimeter-wave (mmWave) band. In the conventional transition, via holes are located around rectangular waveguide and microstrip line prevent power leakage due generation of multi-transmission mode. Therefore, single-transmission mode is dominant at input port with narrow bandwidth single resonance. via-hole positioning utilized add inductance constrain predominance transition. The...

Multibeam base station antennas are introduced for 5G and 6G mobile communication systems. Considering higher frequency bands such as millimeter waves terahertz 6G, dielectric lens become promising candidates due to their simple antenna configuration excellent multibeam radiation characteristics. Therefore, it is important identify the best from existing typical antennas. In this article, a shaped some conventional lenses considered. For types, hyperbolic-planar, plano-convex,...

A broadband microstrip-to-waveguide transition is developed in the millimeter-wave band. Since novel geometrical features are applied printed pattern on substrate, proposed operates over a quite broad frequency bandwidth due to its double resonance. The two resonant frequencies can be controlled independently according dimensions of structure for required and reflection level. Two versions designed reliability confirmed by measurements design 76.5 GHz. 12.9 GHz (16.8 %) obtained level lower...

A topside waveguide-to-microstrip transition whose waveguide sits on the top of substrate was developed in millimeter-wave band. double-layer attached at WR-10 end. coupling patch is located surface with spacing upper thickness from microstrip signal line patterned between and lower substrates. The transmission characteristics are controlled by dimensions insertion length into waveguide. All were optimized electromagnetic analysis finite-element method 76.5 GHz. feasibility confirmed...

A broadband differential-line-to-waveguide transition covering the 260–300 GHz band was developed in this study. This consists of a differential line inserted from narrow wall waveguide that excites an X-shaped patch located at center. As two corners are excited electromagnetically via signal lines opposite phase, orthogonal current components radiate TE <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...

A two-beam slotted leaky waveguide array for mobile reception of dual-polarization direct broadcast from satellite (DBS) is realized in a single-layer structure. Two feed waveguides attached at both ends cross-slotted radiating excite the waves propagating opposite directions. Each them radiates either two circularly polarized symmetrical beam Balanced design beams each polarization imposes symmetry slots. The slot coupling distribution optimized maximum gain under this condition. model...

This study proposes a dielectric lens antenna that implements an impedance matching layer comprising square-pillar periodic structures on the surface to reduce reflection formed in from high-permittivity material. To ease fabrication process, (MS) implemented are made of same material as through microfabrication structure. The dimensions MS unit cell optimized for its period, space occupancy ratio, and height using boundary simulation, considering plane wave incident. Electromagnetic...

Self-resonant helical antenna and capacitor-loaded of the same dimension for coupled-resonant wireless power transfer is discussed. At first, fundamental difference self-resonant demonstrated by calculating electric- magnetic-coupling coefficient. Next, performance antennas are discussed from viewpoints 1) transmission efficiency, 2) undesired emission, 3) near-field leakage, 4) effect human body 5) conductivity. We have found that has an advantage in low loss due to a conductivity wire. On...