Low cost configurable RF signal source for wireless applications

Rohde, Ulrich L.; Poddar, Ajay K.

doi:10.1109/eumc.2007.4405442

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…Hence, its VTRD did not indicate a possible valid operation area at all. In this particular case, the dashed boundary curve of condition (14) lies above the solid one of condition (13). The third design scenario had an even higher bandwidth than scenario (B), yet its maximum τ ɛ is 10 times enhanced, which resulted in a clear VTRD area.…”

Section: Discussionmentioning

confidence: 84%

“…Nonetheless, in order to generate a configurable chirp signal, a laboratory setup is assembled to carry out the required test measurements. As illustrated in Figures 5 and 6, the setup consists of a signal generator (R&S: SMA100B) [13], a real-time oscilloscope with a bandwidth of 4 GHz (R&S: RTO-2044) [14], and a low-noise amplifier (LNA) (ZVE-8G) [15] whose gain is around 30 dB and noise figure is about 4 dB. The signal generator provides good flexibility in generating the required chirp signal in terms of its duration, staring frequency, and gradient.…”

Section: Laboratory Testmentioning

confidence: 99%

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Critical Design Considerations on Continuous Frequency Modulation Localization Systems

Al-Qudsi,

El-Shennawy,

Joram

et al. 2024

IET Signal Processing

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Real-time locating systems (RTLSs) suffer from clock synchronization inaccuracy among their distributed reference nodes. Conventional systems require periodic time synchronization and typically necessitate a two-way ranging (TWR) clock synchronization protocol to eliminate their measurement errors. Particularly, frequency-modulated continuous-wave (FMCW) time-based location systems pose unique design considerations on the TWR that have a significant impact on the quality of their measurements. In this paper, a valid operation design diagram is proposed for the case of an FMCW time-based TWR synchronization protocol. The proposed diagram represents an intersection area of two boundary curves that indicate the functionality of the system at a given frequency bandwidth, spectral length, and clock synchronization ambiguity. It presents an intuitive illustration of the measurement’s expected accuracy by indicating a larger intersection area for relaxed design conditions and vice versa. Furthermore, the absence of a working condition can easily be detected before proceeding with the actual system development. To demonstrate the feasibility of the proposed diagram, four scenarios with different design constraints were evaluated in a Monte-Carlo model of a basic TWR system. Moreover, an experimental measurement setup demonstrated the validity of the proposed diagram. Both the simulation and experimental outcomes show that the indicated valid conditions and the distribution of the measurements’ accuracy are in very good agreement.

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Section: Discussionmentioning

confidence: 84%

Section: Laboratory Testmentioning

confidence: 99%

Critical Design Considerations on Continuous Frequency Modulation Localization Systems

Al-Qudsi,

El-Shennawy,

Joram

et al. 2024

IET Signal Processing

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show abstract

“…To provide stability and better noise level, the local oscillator (LO) input to frequency extender has to be provided using an external source instead of internally by the VNA as is the case for the Band 3, and 5-6 setup. So, two SMA100B signal generators from Rohde&Schwarz [37] are used as an external LO input source. Due to the external source and reduced step-size, the measurement time has been drastically increased.…”

Section: A Metallic Objectmentioning

confidence: 99%

Short-Range SAR Imaging From GHz to THz Waves

et al. 2021

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Synthetic aperture radar (SAR) is a well-known imaging technique and most commonly used up to the microwave frequency spectrum (below 30 GHz) which provides spatial resolution in the sub-m range. To enhance the resolution, higher frequency spectra such as millimeter-wave (mmWave) and terahertz (THz) regions are being investigated. The mmWave and THz spectral ranges extend the SAR applications to nondestructive testing (NDT), material characterization, and sub-mm resolution imaging. However, the higher frequency spectrum suffers from higher path loss and potentially higher atmospheric absorption that limits the propagation distance. Nevertheless, the mmWave/THz spectrum is suitable for short-range applications such as indoor room profiling. From theoretical analysis, it can be summarized that the higher frequency spectrum provides better resolution but a comparative study on the impact on the image quality of the frequency spectrum ranging from GHz to THz has not been presented. Besides, as of the hardware complexity of the THz devices, the optimum range of the spectrum is always under investigation. The optimum range is defined where no strong improvements in the image quality are achievable with further increases in the frequency spectrum. Therefore, this paper presents an overview of electronics-based imaging using the SAR technique for the frequency spectrum ranging from GHz to THz with the focus on NDT and high-resolution imaging. Seven frequency bands: 5-10 GHz, 68-92 GHz, 75-110 GHz, 0.122-0.168 THz, 0.22-0.33 THz, 0.325-0.5 THz, and 0.85-1.1 THz are selected for a comparative analysis. The results are presented for 2D and 3D imaging using the backprojection algorithm. Additionally, state-of-the-art imaging based on SAR technique with electronics transceiver modules has only been demonstrated up to the sub-0.75 THz, whereas in this paper the spectrum up to 1.1 THz has been addressed.INDEX TERMS GHz and THz comparison, high-resolution imaging, non-destructive testing, synthetic aperture radar, terahertz imaging, radar imaging.This article has been accepted for inclusion in a future issue of this journal. Content is final as presented, with the exception of pagination.

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A Flexible Digitally Controlled Oscillator Structure to Reconfigure the Frequency Band in Multi-band RF AD-PLL System

Aditya

Moorthi

2021

IETE Journal of Research

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Low cost configurable RF signal source for wireless applications

Cited by 3 publications

References 7 publications

Critical Design Considerations on Continuous Frequency Modulation Localization Systems

Critical Design Considerations on Continuous Frequency Modulation Localization Systems

Short-Range SAR Imaging From GHz to THz Waves

A Flexible Digitally Controlled Oscillator Structure to Reconfigure the Frequency Band in Multi-band RF AD-PLL System

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