An antenna and an array with photonic bandgap (PBG) structures, which are cylindrical conformal microstrip antennas, both operating in X-band (10.2 GHz) proposed.As shown the simulation, PBG structures could suppress surface wave propagating on substrate balance influence of curvature at resonance frequency antennas.The simulation results indicate that they have a higher gain better directivity over conventional without structure.Both designed manufactured, measurement agree well simulations.

A closely arranged broadband isolated monopole pair (MP) array antenna using a U-shaped resonator is presented. In the design, MP element with short distance of only 6 mm for compact size. To achieve isolation in element, introduced improving both and impedance performances. Different from traditional decoupling method connection lines, works as shunt-resonated coupling neutralizer. It cannot neutralize original lower upper frequency bands but also improve input broad bandwidth. Finally,...

A racket-shaped slot ultra-wideband (UWB) antenna coupled with parasitic strips for band-notched application is proposed in this paper. By attaching a pair of rectangular on the bottom substrate, characteristic well realized. Adjusting length, width two and distance between them, band-rejected fllter at WLAN operation 5.15{5.825GHz frequency band can be obtained. The fabricated has small size 20£37:5mm 2 . Good agreement achieved simulated measured results, both which show an ultra-wide...

A novel tri-band monopole antenna applied to WLAN/WiMAX applications is proposed in this paper. The comprises of two semicircles: one fed by a microstrip line, and the other shorted ground. By incorporating L-shaped strips, good filter as performance achieved. shows multi-band property satisfy requirement WLAN 2.4/5.2/5.8 GHz bands WiMAX 2.5/3.5/5.5 bands. In addition, near omni-directional radiation characteristic also obtained. Experimental data show that can provide three separate...

A novel compact square slot antenna design with coplanar waveguide (CPW)-fed for dual-band operation is presented. The proposed simply composed of a resonator and monopole radiator. By employing the special structure, can achieve new resonance while maintaining small size. Based on this concept, prototype designed, fabricated tested. experimental results show has impedance bandwidths 400MHz (2.33{2.73GHz) 1020MHz (3.27{4.29GHz), covering both WiMAX in 2.5/3.5GHz bands WLAN 2.4GHz band.

A novel decoupling method using coupling stubs is presented to design a wideband 8 × multiple-input–multiple-output (MIMO) array. The array element consists of two tightly coupled printed inverted-F antennas (PIFAs), which are directly contacted and back-to-back for compact structure. To decouple this PIFA pair, elaborately utilized cancel the different couplings. Detailed equivalent circuit parameter analyses show that introduced capacitive from can well original inductive in pair lower...

Direct Position Determination (DPD) of coherent pulse trains using a single moving sensor is considered in this paper. Note that when large observation window and relative maneuvering course between emitter receiver both exist, the localization accuracy Doppler frequency shift only based DPD will decline because noticeable variations. To circumvent problem, rate approach proposed First, signal model intercepted established where taken into consideration. Then, Maximum Likelihood cost...

Two types of mushroom-like high impedance surface are studied. Their wave and reflection phase simulated with a time-domain solver. One is in hexagon pattern described classic paper, the other square designed. The simulation results agree very well measurement data for both structures. It demonstrates that solver an effective versatile tool studying such surfaces.

A planar antenna is designed for ultra-wideband applications in this paper. circular patch as a radiating element printed on dielectric substrate with relative permittivity of 2.65, thickness 1 mm, and fed by 50 Omega microstrip line. gradual changing structure the bottom floor to improve impedance bandwidth. Simulated tested results show proposed can meet (UWB) bandwidth requirement 3.1-10.6 GHz. The has steady-state gain,and omni-directional radiation patterns among working frequency.

Traditional heat sinks for electronics cooling have become ever more difficult to design meet the high dissipation rate of modern high-heat-flux electronics. Active devices, especially devices operating at a frequency, show promise toward enhancing transfer performance. However, active generate noise that may not be acceptable personnel. The present work studies acoustic characteristics piezoelectrically-driven synthetic jets and oscillating plate agitators frequency (around 1000 Hz)...

Active devices, such as synthetic jets and oscillating plate agitators were found to be effective in cooling of high-heat-flux electronics. These devices generate unsteady flows, thinning the thermal boundary layer enhancing turbulent transport. However, active cause extra power consumption due flow friction separation. It is important understand factors influencing these if they are applied system designs. The present study analyzes fluid damping high-frequency (about 1000 Hz) driven by...

To meet the requirement of ultra-wideband (UWB) communications, a T-shaped monopole antenna with cambered ground for UWB applications is proposed in this paper, which coupling between rectangular radiating patch and leads to an impedance bandwidth ensures wide band. By adjusting length width patch, radius ground, distance them, good result can be obtained. The experimentally measured results agree simulated ones, show that achieves broad operating 3.1–12 GHz 10-dB return loss radiation...

A linear wideband antenna array with a cosecant squared pattern is presented in this paper. 32-element distributed along E-plane uniform spacing. Phase-only synthesis of the symmetrical applied to obtain using hybrid method based on differential evolution and continuous ant colony optimization. The achieves an operating bandwidth 5.85-7.6 GHz (26%) active VSWR all elements less than 2.0. shaped region covers up 30 degree peak gain between 17.3 19.1 dBi, side lobe level (SLL) lower -20.0 dB.

As a kind of ultra wideband antenna, the log periodic dipole antenna (LPDA) can operate on infinite large bandwidth in theory. But fact, higher frequencies LPDAs are limited by manufacturing accuracy short dipoles which closed to feed, and lower size long dipoles. So real LPDA reach about 20 : 1 at most. This may limit applications LPDA. In this paper, printed with 30:1 operating from 0.5 15 GHz is present. The feed lines PFTE board 392 mm × 250 1.5 ε <sub...

A coplanar waveguide (CPW) fed ultrawideband (UWB) antenna with band-notched characteristic is proposed and implemented. By inserting a pair of coupling strips in the slot, realized. Adjusting length, width distance between two strips, band-rejected filter at wireless local area network (WLAN) band can be obtained. The fabricated has small size 26×30mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Good agreement achieved simulated...

A compact ultra-wideband (UWB) slot antenna with band-notched characteristic is proposed in this paper. The fabricated consists of a three-arm fork-like metal patch fed by 50 Ω coplanar waveguide (CPW) transmission line, rectangular ground semicircular and pair shorting strips inserted the slot, which creates one notched band. By adjusting length, width two coupling distance between them, band-rejected filter at wireless local area network (WLAN) band can be obtained. experimental results...

Ka band is referred to a microwave whose frequency range from 24.6 GHz 40 GHz, it shares wide available bandwidth, high reuse rate and strong ability of anti-jamming. This paper presents novel method design modulator for Ka-band satellite communication. Using QPSK improve the anti-jamming, using direct modulation reduce weight, volume cost electronic equipment, sub-harmonic mixer cut LO power leakage, excellent results are obtained.

Abstract In this paper, a high-gain dual-beam folded transmit-reflect-array antenna is designed based on the shared aperture method. It consists of top transmit-reflect-array, bottom transmitarray, and feed horn located at center transmitarray. A phase-shifting surface proposed as transmission unit cell capable transmitting incident waves while providing adequate phase shift. The improved into transmit-reflect by adding polarization grids to realize reflection function. transmitarray...

The effective three-dimensional (3-D) Green's functions in spatial domain for general electric and magnetic mixed potential a multilayered media are presented. In terms of the discrete complex image method (DCIM) with higher order Sommerfeld identity, 3-D spatial-domain calculated closed-form, numerical differentiation curl operator integral equation (MPIE) is avoided properly it especially suited LTCC antenna design vertical components aperture coupled structures. results agreeable direct

An efficient magnetic current model for the analysis of low temperature cofired ceramics (LTCC) small aperture coupled patch antennas at high frequency is presented. The approach based on method equivalence and its closed-form multilayer Green's function in spatial domain with moments (MoM). Numerical results return loss LTCC Ka band are analyzed.