Large Signal Analysis of Nonlinear Microwave Systems

Steer, M.B.; Khan, P.J.

doi:10.1109/mwsym.1984.1131807

Cited by 2 publications

(5 citation statements)

References 2 publications

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“…However, according to Figure 9a, the loss is seen to be around 95 dB. This discrepancy is probably due to the fact that the 21 S measurements are made on a network analyzer and the results in Figure 9a are likely limited by the network analyzer's noise floor or the internal coupling. Table 2.…”

Section: System Hardware Designmentioning

confidence: 95%

“…Therefore, multiple filters need to be cascaded to increase the stop band attenuation. Figure 6 shows the measured and theoretical 21 S response when two VLF-1200 filters are cascaded. The theoretical cascaded 21 S response was computed as a product of the individual 21 S responses.…”

Section: Filter Considerationsmentioning

confidence: 99%

“…Figure 6 shows the measured and theoretical 21 S response when two VLF-1200 filters are cascaded. The theoretical cascaded 21 S response was computed as a product of the individual 21 S responses. When the two reflective low-pass filters are cascaded, the measured and theoretical responses do not closely match.…”

Section: Filter Considerationsmentioning

confidence: 99%

“…By terminating the high-frequency port, the stop band frequencies have a path to 50 Ω and the cascaded network is well-behaved. Figure 7 shows the 21 S response when two diplexers are cascaded in a low-pass configuration. Figure 7 shows that when two diplexers are cascaded, the measured |S 21 | closely matches the theoretical response.…”

Section: Diplexer Considerationsmentioning

confidence: 99%

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Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System

et al. 2018

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Radio frequency (RF) circuit elements that are traditionally considered to be linear frequently exhibit nonlinear properties that affect the intended operation of many other RF systems. Devices such as RF connectors, antennas, attenuators, resistors, and dissimilar metal junctions generate nonlinear distortion that degrades primary RF system performance. The communications industry is greatly affected by these unintended and unexpected nonlinear distortions. The high transmit power and tight channel spacing of the communication channel makes communications very susceptible to nonlinear distortion. To minimize nonlinear distortion in RF systems, specialized circuits are required to measure the low level nonlinear distortions created from traditionally linear devices, i.e., connectors, cables, antennas, etc. Measuring the low-level nonlinear distortion is a difficult problem. The measurement system requires the use of high power probe signals and the capability to measure very weak nonlinear distortions. Measuring the weak nonlinear distortion becomes increasingly difficult in the presence of higher power probe signals, as the high power probe signal generates distortion products in the measurement system. This paper describes a circuit design architecture that achieves 175 dB of dynamic range which can be used to measure low level harmonic distortion from various passive RF circuit elements.

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Section: System Hardware Designmentioning

confidence: 95%

Section: Filter Considerationsmentioning

confidence: 99%

Section: Filter Considerationsmentioning

confidence: 99%

Section: Diplexer Considerationsmentioning

confidence: 99%

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Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System

et al. 2018

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“…Subsequently, it is directed to the RF input port of a mixer module designed to handle higher-frequency inputs. The mixer unit combines the second-order multiplied LO input signal with the RF harmonic input signal to produce an intermediate frequency (IF) output of similar harmonic frequency discussed in [27]. The IF output signal is then directed to a two-stage operational amplifier gain unit to further amplify the second-order harmonic signal.…”

Section: Receiver Chain Blockmentioning

confidence: 99%

Circular Polarized Antennas With Harmonic Radar: Passive Nonlinear Tag Localization

Yadav,

Zeng,

2024

IEEE J. Sel. Areas Sensors

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This research proposes a high performance, low-profile planar design, and demonstration of circularly polarized harmonic antenna arrays for 4 and 8 GHz harmonic radar system which is equipped, and the antenna's circular polarization performance is tested using a passive non-linear harmonic tag (snowflake) in a noisy environment. This work mainly concentrates on investigation of the wave polarization (Circular), gain estimation and impedance matching of the antenna arrays that will be potentially assembled to the 2 nd order harmonic radar system operating at 4 and 8 GHz, which plays a critical role in 2-D tag localization and post processing methods. The passive snowflake tag design is implemented in the simulation to determine the current distribution and gain plot patterns in comparison to a classic dipole antenna tag structure. In experiments: a combination of fundamental circular polarized (Left-hand) antennas were demonstrated to find Axial Ratio (A.R.) ≤ 3 dB band. A novel tag 2-D localization measurement, combination of CP harmonic antenna arrays is utilized to perform and obtain the circular polarized received signal power in dBm v/s angle rotation by every 10° on a rotating platform setup. Finally, the wireless tag tracking result is achieved by using the designed circularly polarized antennas and the passive non-linear tag orientation setup.

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Large Signal Analysis of Nonlinear Microwave Systems

Cited by 2 publications

References 2 publications

Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System

Hardware Design of a High Dynamic Range Radio Frequency (RF) Harmonic Measurement System

Circular Polarized Antennas With Harmonic Radar: Passive Nonlinear Tag Localization

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