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A broadband monopole antenna for circularly-polarized (CP) applications is proposed. The broadband property of the antenna is basically achieved not only by the chifre-shaped monople radiator but also its asymmetric microstrip feedline. The CP characteristics is enhanced significantly by adjusting the lacation of the monople feed. The antenna delivers wideband performance in terms of impedance matching...
A novel planar broadband antenna with series capacitive loading is presented in this paper. The proposed antenna consists of 12 metal patches. The desired capacitive loading is achieved by fixing gaps between the conductive patches. The widths of these gaps are increasing from the feed end along the monopole. The loaded capacitance leads to good broadband characteristics of the proposed antenna. Stubs...
Amplitude balanced two-section quadrature hybrid using a microstrip lines is proposed. The proposed microstrip quadrature hybrid with unequally reduced impedances compared to the original values of longitudinal and transverse branches was optimized using HFSS simulations. Two-section microstrip line hybrid has measured bandwidth of 34%, good amplitude balance of ± 0.35 dB, good reflection and isolation...
A broadband Magic-T using 3-dB coupler and 90° phase shifter is proposed in this paper. Microstrip/Slot technology has been employed in the design. Compared with the conventional magic-T, it can operate over an ultra-wideband. Results of simulation and measurement show that the relative bandwidth is 105 % with the VSWR less than 1.85, and the insertion loss less than 1.6 dB. The phase ripple is ±12°...
This paper proposes to extend the bandwidth of speech acquired by a system combining laser Doppler vibrometer (LDV) and an auxiliary microphone in adverse environments, where this system is referred to as LDV-AM. Traditional bandwidth extension (BWE) algorithms often need two stages to estimate the broadband spectral envelope. In the first stage, the codebook of the broadband spectral envelope is...
Two new broadband CP reflectarray elements operating at 15 GHz are proposed and two reflectarrays with the corresponding elements are simulated. The results of a traditional reflectarray consisting of the split ring element at 15 GHz are presented for comparison. As the results show that the bandwidths of the proposed elements and reflectarrays are improved efficiently compared to the split ring element...
A novel dual-sleeve broadband antenna for 2G/3G/4G mobile communications is presented. By using end-loaded technology the input impedance of the designed antenna is decreased and the bandwidth of the antenna is expanded. The operating frequency of dual-sleeve antenna is 0.8GHz to 2.7GHz, where the voltage standing wave ratio (VSWR) is less than 1.5. A prototype is constructed and tested, which shows...
A broadband balun with the compensated coupled line at balanced ports has been proposed. The operating fractional bandwidth of the proposed balan is 10% more than that of the conventional Marchand balun. Moreover, the proposed method can be employed for a long connecting segment between the balanced ports with tight coupling at desired frequencies. In addition, summarized graphs are provided as well...
In this work, a miniature broadband branch-line coupler is proposed. By implementing the quarter-wavelength lines in a three-stage branch-line coupler using bridged T-coils, the circuit size can be largely reduced with no reduction in bandwidth. Specifically, a proposed broadband branch-line coupler with a center frequency f0 = 2.2 GHz is implemented using a silicon-based IPD process. The circuit...
A wideband radar absorber comprising single-layer resistively loaded frequency selective surface (FSS) is presented in this paper. The FSS is printed on a thin dielectric substrate separated from the metal ground by an air spacer. Numerical result shows that the proposed absorber provides 10 dB absorption bandwidth over the frequency range of 3.96 – 13.36 GHz, which is equivalent to 108.54%. Moreover,...
In this paper, a broadband circuit analog absorber has been presented based on lumped resistors, which exhibits 10 dB absorption bandwidth from 3.96 GHz to 8.16 GHz, covering entire C-band. The designed structure is polarization-insensitive and wide-angle absorptive. The effect of the lumped resistors has been studied to examine the absorption mechanism of the wideband absorber. The structure has...
Increasing demand for quality, high speed mobile services, and the expected socioeconomic benefits associated to them, have turned the attention to the need for radio spectrum with specific characteristics. The underlying reason is that such services require spectrum which is a scarce and highly valuable input. Consequently, many countries have reassigned portions of spectrum in order to maximize...
Today's residential Internet service is bundled and shared by a multiplicity of household devices and members, causing several performance problems. Customizing broadband sharing to the needs and usage patterns of each individual house has hitherto been difficult for ISPs and home router vendors. In this paper we design, implement, and evaluate a system that allows a third-party to create new services...
Broadband network performance is multi-faceted: it varies by ISP, by content source, by household connection, and by time-of-day. Daily or monthly averages, as published by content providers such as Netflix and Google, do not convey the full picture. In this paper we leverage M-Lab, the world's largest open measurement platform, to characterize broadband performance across Australian households. Our...
A broadband circularly polarized (CP) cross-dipole antenna is proposed for GNSS applications. The antenna has a very simple structure and a small size but has a very broad impedance bandwidth from 1.15 to 1.75 GHz (a fractional bandwidth of 41.4%) for S11 < −10 dB. The CP bandwidth is from 1.37 to 1.5 GHz for axial ratio < 3 dB. A computer simulation is conducted to optimize its dimensions and...
This paper introduces several emerging reconfigurable antenna elements for modern broadband wireless communication systems. Firstly, we will present a broadband uni-directional circular polarization (CP) reconfigurable antenna consisting of four planar monopole radiators and an broadband output phase reconfigurable feeding network. Switchable left-handed circular polarization (LHCP) and right-handed...
Having 10X higher data rate than 4G mobile which is already in a few hundred Mbps, 5G mobile, which is said to be commercialized in 2020, presents a sounding challenge to implementation of ICs used in 5G mobile devices. 5G mobile is expected to embrace some new technologies. Developing millimeter wave RF IC with cost and power consumption that could meet requirement of a mobile device is something...
In this paper, a novel 3 dB 180° power divider/combiner is proposed. This device is derived from the classical Wilkinson divider/combiner whose output ports were combined with inverting and non-inverting suspended microstrip lines (SMLs). The proposed structure has a reduced size compared with the conventional and enhanced variants of the 3 dB 180° divider/combiner topologies. Moreover, the new architecture...
Smart homes provide unique information platform with different communication technologies including both licensed and unlicensed frequency bands. The number of these small cells is forecast to become huge, which eliminate the traditional network deployment and operational techniques. At present, the internet access of a smart home is dependent on the unreliable customer broadband connection for its...
We demonstrate the direct generation of broadband wavelength-multiplexed polarization entangled photons from a single monolithic chip. The obtained concurrence of 0.98±0.01, and bandwidth of 95 nm are the highest values reported in any waveguide source, setting new limits for monolithic quantum technologies.
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