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In this paper, a new FSPA for new application — outdoor RF energy harvesting will proposed and designed. A new FSPA structure will joint with folded patch meander line and two pairs of slot embedded into its ground plane. A less profile, less cost and ease to fabricate the folded shorted patch antenna (FSPA) will introduced. The proposed antenna designing and performing using Computer Simulation Technology...
The passive intermodulation (PIM) had rarely caused a concern for the Radio Frequency (RF) compliance testing of licensed wireless systems in the past. But this may change as the broadband LTE (Long-Term Evolution) systems with MIMO (multiple-input and multiple-output) technology are being rolled out nationwide. This article discusses the causes of PIM distortion in RF testing and elaborates on why...
Circuit-based optical networks have the potential to provide end-to-end dedicated channels with flexible data rates between edge node pairs. However, the data-rate granularity of spectral-slicing in the optical domain based on wavelength-selective switch (WSS) is limited by the optical filter frequency selectivity. Digital subcarrier multiplexing (DSCM) in the electrical domain is able to provide...
Methods for digital, phase-coherent acoustic communication date to at least the work of Stojanjovic, et al [20], and the added robustness afforded by improved phase tracking and compensation of Johnson, et al [21]. This work explores the use of such methods for communications through tissue for potential biomedical applications, using the tremendous bandwidth available in commercial medical ultrasound...
In this paper, a contiguous carrier aggregation scheme for the downlink transmissions in an inband full-duplex cellular network is analyzed. In particular, we consider a scenario where the base station transmits over a wider bandwidth than the mobiles, while both parties are still using the same center frequency. As a result, the mobiles must cancel their own self-interference over a wider bandwidth,...
In this paper, we report the design methods and numerical results for a novel and compact circular waveguide TM02-TE11 mode converter, which has a high pure TE11 mode output. The converter has been designed to transform the high order TM02 circular waveguide output mode from relativistic backward-wave oscillators into the fundamental TE11 circular waveguide mode. The results show that the purity of...
This paper presents a low cost and efficient method to compensate the phase and magnitude errors of transmitting ultra-wideband (UWB) linear frequency modulation (LFM) waveform with complex pre-distortion correction coefficients. In this method, a high linearity LFM waveform is generated by a direct digital synthesis (DDS) module. The phase and magnitude errors of the output LFM signal are sampled...
This paper proposes the design of a new compact, low power consumption, portable K-band FMCW radar for short distance ranging applications from composition, choice, and design of system. This new system uses triangle wave modulation mode, the tuning bandwidth is 300MHz (24.0GHz–24.3GHz), the modulation period is 2ms. With external low-noise amplifier and power amplifier, its measuring distance up...
V and W band frequencies are becoming increasingly more interesting to system designers as the demand for communications bandwidth continues to grow. Regulated applications of the RF spectrum in these bands are few and provide an opportunity for new applications at high data rates. We review the current interest at these frequencies and the previous orbital experiments designed to conduct long term...
The preferential placement of the platforms in a coherent RF network to suppress sidelobe energy close to the array mainbeam is analyzed in this work. A linear array consisting of nine platforms within a 9000λ array size is optimized with a genetic algorithm. A large set of platform layouts that achieve sidelobe suppression of nearly 3 dB exists. The layouts are tolerant to position error on the order...
This paper presents results from the study of co-existence between second generation digital video broadcasting terrestrial-lite (DVB-T2-Lite) and Long-Term Evolution (LTE) downlink networks in a shared radio frequency (RF) band. Partial overlapping coexistence scenarios are considered. A laboratory measurement testbed is used to measure the impact of interfering LTE system on DVB-T2-Lite system....
A design of electrically small multi-turn loop antennas for on-the-move man-pack high frequency near vertical incidence skywave communications is discussed. Parameters such as bandwidth, gain, and RF exposure are considered for loops with 1, 2 and 3 turns as well as with a 2-arm loop configuration. For the initial study, all loop diameters are set at 1 m. It is shown that more turns on a loop antenna...
We show how the bandwidth over which power can be transferred from multiple radio-frequency sources to multiple loads scales with the number of sources and loads. Our principal tools include broadband multiport matching upper bounds on the integral over all frequency of the logarithm of a suitably defined power reflection ratio. We also characterize matching structures whose bandwidth scale as the...
A radio-frequency source generally can be closely matched to a load only over a restricted bandwidth. One measure of the maximum possible bandwidth is the Bode-Fano bound. Although the bound is often a good measure of the maximum bandwidth, there exist certain loads for which the bound is loose, and therefore cannot be attained by any matching network. We present a method to tighten the Bode-Fano...
Single modulated signal is apt to be captured by passive detector in radar system. In this study, we put forward the structure of LFM/Barker which is a hybrid modulated signal based on linear frequency modulation (LFM)signal and Barker code, discuss ambiguity function and intercept factor and power spectrum density (PSD). Simulation results show that the designed signal has a lower peak-to-sidelobe...
This paper studies possible physical layer enhancements to the Long Term Evolution (LTE) evolved Multimedia Broadcast Multicast Service (eMBMS) system to improve its spectrum efficiency and service quality using channel bonding of wide band Radio Frequency (RF) transmission, non-orthogonal multiplexing, e.g., Layered Division Multiplexing (LDM), and larger Cyclic Prefix (CP) duration and cell size...
This paper presents a low current, 100 MHz bandwidth envelope detector (ED). The targeted functions relate to the need for many on-chip envelope dependent control schemes for improvement of linearity, efficiency, protection circuits, etc. in CMOS-based transceiver and RFIC power amplifiers (PAs). Measurements from an integrated circuit including an envelope detector and an RF amplifier fabricated...
In Rel-13, Licensed-Assisted Access (LAA) to unlicensed spectrum has been approved as a new work item to meet the increasing traffic demands for operators. For LAA, the listen-before-talk (LBT) is an efficient way to ensure fair and friendly coexistence in unlicensed band with other operators and radio access technologies (RATs). To use more bandwidth, multiple unlicensed carriers could be aggregated...
We explore a bandwidth efficient transmission scheme that amalgamates multiple-input-multiple-output spatial multiplexing (SMX) with receive antenna based spatial modulation (RSM). The RSM here is applied to the combined spatial and power-level domain, not by activating and de-activating the receive antennas, but rather by choosing between two power levels {Ρι,Ρ2} for the received symbols in these...
A D-Band downconverter implemented in a 130-nm SiGe BiCMOS technology is presented. The mixer is based on a double-balanced Gilbert cell topology with emitter-follower based output IF buffers. The chip includes an integrated 3-stage LO buffer and RF/LO LC-baluns for single-ended on-wafer measurements. Measurements show a peak conversion gain (CG) of 11 dB at 170 GHz, and an input-referred 1 dB compression...
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