Photo-injection p-i-n diode switch for high-power RF switching

Jacobs, E. W.; Fogliatti, D.W.; Nguyen, Hieu V.; Albares, D. J.; Chang, C.T.; Sun, Chen

doi:10.1109/22.982217

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…One option to compensate for path loss is to increase the transmit power, which is not always possible due to power consumption considerations and eye-safety regulations. In [2,3], a nondirected non-LOS architecture based upon utilization of an angle-diversity receiver and a multibeam transmitter has been reported. An angle-diversity receiver utilizes multiple receiving elements that are oriented in different directions.…”

Section: Introductionmentioning

confidence: 99%

“…Intensive research in this field led to the demonstration of various microwave devices using the photoconductivity effect. In recent years, CW-or quasi-CW mode optically controlled microwave devices have also been an area of growing interest for novel devices, such as optically reconfigurable antenna arrays [3,4]. However, adverse influences are observed in the CW-mode operations.…”

Section: Introductionmentioning

confidence: 99%

“…In [2,3], a nondirected non-LOS architecture based upon utilization of an angle-diversity receiver and a multibeam trans-mitter has been reported. An angle-diversity receiver utilizes multiple receiving elements that are oriented in different directions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental results for a CW‐mode optically controlled microwave switch on a silicon‐based coplanar waveguide

S¹,

Kuga²,

Mullen³

2003

Micro & Optical Tech Letters

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Novel design of a dual-band dipole antenna printed on an FR4 substrate to achieve diversity operation in the 2.4-GHz and 5.2-GHz bands for a WLAN access point has been proposed. A constructed prototype has also been successfully implemented, and two separate wide resonant modes covering the 2.4-GHz and 5.2-GHz WLAN bands have been obtained. In addition, the measured radiation patterns of the antenna's two operating ports are directional in two complementary half spaces, which make the WLAN access point capable of performing spatial diversity to combat the multipath interfering problem and enhance system performance. Optical control has been emphasized in microwave devices due to unique advantages such as fast response, immunity from EMI, high power handling, good isolation between controlling and controlled devices, and possibilities for monolithic integration with other devices [1]. Since the reporting of picosecond photoconductivity, various microwave devices using the photoconductivity effect have been developed. One simple application for the photoconductivity effect is the direct excitation of a gap on a semiconductor transmission line with a laser light. The transmission characteristics can be controlled with the generated free carriers; the ON and OFF states can be used for a switching device or an attenuator. Initially, picosecond switches using pulse laser sources were developed as very useful techniques [2]. Intensive research in this field led to the demonstration of various microwave devices using the photoconductivity effect. In recent years, CW-or quasi-CW mode optically controlled microwave devices have also been an area of growing interest for novel devices, such as optically reconfigurable antenna arrays [3,4]. However, adverse influences are observed in the CW-mode operations. The number of generated free carriers may not increase in proportion to the incident optical power in the very high power range. Thus, obtaining higher photoconductivity may not be possible even though the incident optical power is increased in CW-mode operation [5, 6]. In a very low duty pulse-mode OMS, the pulse duration is much shorter than the recombination rate, and the carrier recombination can be ignored in counting the number of optically generated free-carriers. Thus, a direct bandgap material such as GaAs, which has a very short recombination rate, can be effectively used to reduce switching speed. However, in the CW-mode operation, the number of optically generated free-carriers is directly related to the recombination rate of the substrate material. In the steady state, the number of optically generated free-carriers is given by [5]: EXPERIMENTAL RESULTS FOR A CW-MODE OPTICALLY CONTROLLED MICROWAVE SWITCH ON A SILICON-BASED COPLANAR WAVEGUIDEwhere ␣ is the absorption coefficient, I() is light intensity, h is the photon energy to excite electrons, R is the surface reflectivity, S is the relative spectral response of the semiconductor material exhibiting a peak response at 0 , and is the recombination rate or ca...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental results for a CW‐mode optically controlled microwave switch on a silicon‐based coplanar waveguide

S¹,

Kuga²,

Mullen³

2003

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…Unfortunately, this assumption can hardly be held in practical scenarios. RF switches are developed to control "on-out" state of the transmit antenna with high-speed [8]. Therefore, we design a switched antenna array to simulate linear motion of the transmit antenna with high-speed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Rf Directional Modulation Technique Using a Switched Antenna Array for Communication and Direction-Finding Applications

Hong¹,

Song²,

Liu³

2011

PIER

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Abstract-A RF directional modulation technique using a switched antenna array is proposed for communication and direction-finding applications. The main idea is that a baseband modulation signal is transmitted by the switched antenna array. The phase center of the transmit signal is moved by the feeding line of each element from the left to the right. In this way, the data information and Doppler frequency shift information are modulated into a transmit signal constellation simultaneously. Therefore, this constellation is a scrambled constellation compared with traditional baseband modulation signal, which varies with the azimuth angle information of the receiver. For the receiver with a single antenna, a differential correlation algorithm is employed to demodulate the data information, and an azimuth angle estimation algorithm is also developed to extract the azimuth angle information from this scrambled constellation. Simulation results show that this RF directional modulation technique offers a comprehensive scheme for communication and direction-finding from the point view of RF modulation technique.

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A high power microwave triggered RF opening switch

Beeson

Dickens

Neuber

2015

Review of Scientific Instruments

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A 4-port S-band waveguide structure was designed and fabricated such that a signal of any amplitude (less than 1 MW) can be switched from a normally closed state, <0.5 dB insertion loss (IL), to an open state >30 dB IL by initiating plasma in a gas cell situated at the junction of this waveguide and one propagating a megawatt level magnetron pulse. The 90/10 switching time is as low as 20 ns with a delay of ∼30 ns between the onset of the high power microwave pulse and the initial drop of the signal. Two ports of this device are for the high power triggering pulse while the other two ports are for the triggered signal in a Moreno-like coupler configuration. In order to maintain high isolation, these two sets of waveguides are rotated 90° from each other with a TE111 resonator/plasma cell located at the intersection. This manuscript describes the design and optimization of this structure using COMSOL 4.4 at the design frequency of 2.85 GHz, comparison of simulated scattering parameters with measured "cold tests" (testing without plasma), and finally the temporal waveforms of this device being used to successfully switch a low power CW signal from 2 W to <5 mW on a sub-microsecond timescale.

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Photo-injection p-i-n diode switch for high-power RF switching

Cited by 4 publications

References 12 publications

Experimental results for a CW‐mode optically controlled microwave switch on a silicon‐based coplanar waveguide

Experimental results for a CW‐mode optically controlled microwave switch on a silicon‐based coplanar waveguide

Rf Directional Modulation Technique Using a Switched Antenna Array for Communication and Direction-Finding Applications

A high power microwave triggered RF opening switch

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