Free-space power combining and beam steering of ultra-wideband radiation using an array of laser-triggered antennas

Funk, E.E.; Lee, C.H.

doi:10.1109/22.543960

Cited by 35 publications

(5 citation statements)

References 18 publications

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“…According to the US Federal Communication Commission, UWB signal is defined as a signal having fractional bandwidth greater than 20% of the center frequency [1]. The ultra wide bandwidth of the system causes antenna design to be a new challenge [2][3][4][5]. This is because the multipath fading and interferences become more apparent than in narrow band systems.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different antenna arrays for the BER reduction in indoor wireless communication

Chiu

Liao

2011

Int J Communication

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In this paper, we use the ultra wideband antenna array combined with particle swarm optimization (PSO) to minimize the BER for indoor communication systems. Three types of antenna arrays, namely the circular shape, L shape, and Y shape arrays, are used in the transmitter and their corresponding BER on several paths in the indoor environment are calculated. On the basis of the topography of the antenna array and the BER formula, the array pattern synthesis problem can be reformulated into an optimization problem and solved by the PSO. The novelties of our approach is not only choosing BER as the object function instead of the sidelobe level of the antenna pattern, but also considering the antenna feed length effect of each array element. The particle swarm optimization algorithm is employed to optimize the excitation voltages and feed lengths for these antenna arrays to reduce the BER. The strong point of the PSO is that it can find the solution even if the performance index cannot be formulated by simple equations. By the obtained antenna patterns, we can know the route with the lowest BER; meanwhile, transmission power using this route can be reduced. Numerical results show that the synthesized antenna array pattern is effective in focusing maximum gain to the line-of-sight path for these antenna arrays. The synthesized array pattern also can mitigate severe multipath fading in complex propagation environments. As a result, the BER can be reduced substantially in indoor ultra wideband communication systems. The investigated results can help communication engineers improve their planning and design of indoor wireless communication.

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Section: Introductionmentioning

confidence: 99%

Comparison of different antenna arrays for the BER reduction in indoor wireless communication

Chiu

Liao

2011

Int J Communication

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“…A linear PCSS has higher synchronization precision and less jitter, which is important in applications requiring accurate synchronization, such as laser nuclear fusion, ultrafast electrooptic sampling, and injection wave generators. It has motivated a significant amount of research on a switch with minimum jitter [4][5][6][7][8].…”

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confidence: 99%

Influence of the incident laser pulse energy on jitter time of GaAs photoconductive semiconductor switches

et al. 2013

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We have experimentally investigated the jitter time of a GaAs photoconductive switch (PCSS) when it is triggered by a laser pulse with 30 ns pulse width and 1064 nm wavelength. It is found that the jitter time decreases as the incident laser pulse energy increases from 0.40 to 1.6 mJ. In addition, a theoretical analysis indicates that the jitter time is proportional to relative deviation of the laser pulse energy. This work provides a path to improve the performance of the PCSS, which is used in applications such as a high time precision synchronous control system and ultrawide-band radiation source.

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“…Since its invention in 1975 by Auston [1], the photoconductive semiconductor switch (PCSS) has attracted considerable attention in the areas of large current sparking equipment, active denial weapons, high power microwave systems [2][3][4], precision time synchronization, THz technology, instantaneous measuring apparatus [5][6][7][8], impulse radar, electromagnetic interference and attacking systems [9,10]. This is because the PCSS possesses the advantageous characteristics of high power density (1-100 MW), fast responses (~1 ps), low time jitters (~1 ps), effective anti-EMI (excellent electric and optical separation), small volume and easy integration [11,12].…”

mentioning

confidence: 99%

High power, longevity gallium arsenide photoconductive semiconductor switches

et al. 2010

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Free-space power combining and beam steering of ultra-wideband radiation using an array of laser-triggered antennas

Cited by 35 publications

References 18 publications

Comparison of different antenna arrays for the BER reduction in indoor wireless communication

Comparison of different antenna arrays for the BER reduction in indoor wireless communication

Influence of the incident laser pulse energy on jitter time of GaAs photoconductive semiconductor switches

High power, longevity gallium arsenide photoconductive semiconductor switches

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