We use the nonlinear dynamics approach for studying delayed feedback optoelectronic oscillators (OEOs) formed by hybrid integration of resonant tunneling diode (RTD) photo-detectors with laser diodes, in both single and dual optical fiber routes. In loop topology, performance RTD-OEO free-running self-sustained oscillator is improved terms phase noise, a compromise between delay line strength re-injection. dual-loop configuration, superior achieved due to suppression side modes associated...

Abstract Optical modulation characteristics of resonant tunneling diode photodetectors (RTD‐PD) are investigated. Intensity modulated light excites the RTD‐PDs to conduct data experiments. Simple and complex patterns used with results showing rates up 80 200 Mbit/s, respectively. This is first demonstration using diodes.

A reflection amplifier module with up to 14 dB gain at 21 GHz is described, which capable of direct detection amplitude modulated incident signals K band. The consists a single pseudomorphic high electron mobility transistor (pHEMT) gallium arsenide integrated circuit attached microstrip patch antenna. Experimental sensitivity characteristics for the are given several bias conditions. These results show that as low −75 dBm. In addition, control through d.c. modification used directly encode...

We report on the direct intensity modulation characteristics of a high-speed resonant tunneling diode-photodetector (RTD-PD) with an oscillation frequency 79 GHz. This work demonstrates both electrical and optical shows that RTD-PD oscillators can be utilized as versatile optoelectronic/radio interfaces. is first demonstration RF carrier using integrated at microwave frequencies.

The design procedure, fabrication and measurement of a Class-E power amplifier with excellent second- third-harmonic suppression levels are presented. A simplified technique offering compact physical layout is proposed. With 1.2 mm gate-width GaAs MESFET as switching device, the capable delivering 19.2 dBm output at 2.41 GHz, achieves peak PAE 60% drain efficiency 69%, exhibits 9 dB gain when operated from 3 V DC supply voltage. When compared to classical two-harmonic termination amplifier,...

In this work a novel MMIC reflection amplifier is presented which capable of more than 10 dB return gain and operates at K band. The occupies an area only 1.5 mm × 2 has been fabricated using OMMIC D01PH process technology. die successfully connected to 50 Ω band horn antenna as well compact patch antenna. Return above 14 7.5 measured when transmitted signal incident upon the systems respectively.

Phase-locked oscillators based on resonant tunneling diodes are used in this study to implement transceiver components that perform conversion between optical and wireless phase shift-keyed signals using injection-locked oscillator techniques. Three different links demonstrated at frequencies of 940 MHz, 1.3 GHz, 3.2 GHz capable locking a phase-modulated signal propagates from the back domains. The transmitter receiver evaluated through Gaussian minimum shift-keying modulation accuracy...

Injection-locked oscillations at 8.5 and 11.3 GHz are reported in structures with four GaAs/AlAs double barrier resonant tunnelling diodes bridging a coplanar line. Their outputs add to the observed –8 dBm. More devices within smaller geometry could generate 0 dBm up several hundred gigahertz.

In this work, we show a new method which can directly encode an I (in-phase) and Q (quadrature-phase) baseband data stream onto circularly polarized (CP) microwave signal. Here components are fed into two port CP antenna in order to yield right hand circular (RHCP) or left (LHCP) waveforms each encoded with zero 180deg phase shift effect QPSK modulation. The signal from such will have deterministic unequal amplitude shifts at different far field spatial locations if not compensated degrade...

The dynamic behavior of AlInGaAs ridge waveguide distributed feedback lasers is reported in this work covering five detuned wavelengths between 1291 nm and 1326 for a laser active layer optical peak gain design centered at 1310 room temperature. detuning achieved by modifying the grating pitch that performs mode selection within cavity simultaneously across single processed wafer. evaluated using resonance frequencies measured range injection currents heatsink temperatures 25°C 85°C. results...

The ability to use resonant tunneling diodes (RTDs) as both transmitters and receivers is an emerging topic, especially with regards wireless communications. Successful data transmission has been achieved using electronic RTDs carrier frequencies exceeding 0.3 THz. Specific optical-based RTDs, which act photodetectors, have developed by adjusting the device structure include a light absorption layer small optical windows on top of allow direct access. This also allows signal directly...

A 2D planar Luneburg lens cooperating with a MMIC reflection amplifier for radar cross-section (RCS) enhancement is reported. The will operate in TEM mode K band. band when attached feed, produces an additional measured gain of 10 dB at 19.6 GHz, above that which can be obtained from equivalent passive reflector. Additionally this system demonstrates the reflected signal amplitude modulated through bias variation. This new shows terminated reflector act as simple means realising active RCS...

This paper gives the first experimental characterisation of phase noise response recently introduced Inverse class E topology when operated as an amplifier and then oscillator. The results indicate that in oscillator modes operation conversion efficiencies 64%, 42% respectively are available, excess PM added a consequence saturated about 10 dB increase over expected from small-signal A operating at much lower efficiency. transfer dependence on device drain bias flicker presented order to...

A simplified transceiver architecture based on resonant tunneling diodes is used to convert phase modulated signals from optical wireless domain. Conversion of digital and analog modulation demonstrated at a frequency 3.2 GHz.

Abstract We report the measurement of modulated backscatter produced by a Schottky diode and printed patch antenna array at V‐band (58.75 GHz). The tag was fabricated on liquid crystalline polymer substrate that is used as dielectric film carrier for wire bonded to surface array. An inexpensive commercial transceiver chipset successfully detect when switched kHz frequencies, demonstrating effect strong enough be in applications requiring lightweight, wearable transponders. © 2011 Wiley...

A demonstration of the effect tuning components on a directly modulated distributed feedback laser (DFB) high-frequency performance is shown in this paper. network based three inductors and microstrip line used to impedance match parasitic reactance diode within bandwidth. The matching transmission under these conditions compared with radio frequency simulation that include intrinsic model DFB its internal reactance, added external components.

Dynamic performance of directly modulated Fabry–Pérot lasers is presented in this work subject to variation parameters such as cavity length and facet reflectivity. This study focused on the effect that physical have slope laser resonance frequency against square root injection current. Temperature also studied determine modulation bandwidth available for high speed device operation at 10 Gbps. The reflectivity temperature over spectrum wavelength discussed.

A self-pulsed, self-oscillating detector sensor based on a gallium arsenide reflection amplifier monolithic microwave integrated circuit and microstrip patch antenna is presented. The sensor, which can detect signals as low −120 dBm in 30 Hz bandwidth at modulated backscatter frequencies above 20 kHz, operates 19.8 GHz requires single 3.7 V DC bias supply.

In this work the performance of two 90deg GaAs hybrid coupler MMICs based on lumped and quasi-lumped designs are compared for S-band operation. The consists parallel lambda/8 long 50 Omega lines separated at each end by capacitors, as a consequence occupies only 0.15 area an equivalent lambda/4 distributed quadrature coupler. is line version classical experimental S-parameter performances both couplers compared. design has 0.5 dB insertion loss to 1.3 MMIC hybrid. addition offers superior...

In this paper the design, fabrication and test of a 90deg hybrid coupler MMIC based on an ultra compact quasi-lumped design is presented for use in 24 GHz ISM frequency band. The insertion loss isolation are 0.5 dB -17 respectively, return better than -15 over 14% bandwidth. technology used GaAs consists parallel lambda/8 long 50 Omega lines separated by lumped capacitors. structure occupies 0.15 times area equivalent lambda/4 distributed

The authors demonstrate the detection of a millimetre wave frequency-selective surface with null near 60 GHz at large standoff distances (≥10 m) such as would be required for covert security labelling and anti-counterfeiting applications. compare performance using lenses offset parabolic reflector to improve directivity commercial, compact, integrated chipset in ball grid array package, finding reduction beam width from 5 10°, respectively. They measured power spectrum system no label 35 cm,...

The changes in the impedance of an antenna-coupled photo-detector under optical illumination are used to encode data on a backscattered wireless signal similarly standard techniques for radio frequency identification and tagging. effect is strong enough allow retrieval information without requiring dc supply at interface.

The authors present and experimentally evaluate a scheme for measuring the frequency response of propagation channels frequency-selective surfaces (FSSs) from 56.5–62 GHz in US-defined license-free industrial, scientific medical band using commercially available millimeter-wave transceiver chip set. exploit chipset's IQ modulation to produce single sideband signal that allows magnitude baseband be correlated carrier power. Data can recorded at 600 different frequencies 130 s, while fastest...

A self-tracking (aligning) radio communications system based on the principle of modulated backscatter detection is presented here. Using amplitude-modulated from a co-operating target, modified IQ demodulation scheme used to reproduce automatically and in real time both received conjugate phase an incoming signal. The conjugated demodulated IF signal can have backscattered data removed new are inserted before being up-converted using single side-band generation so that retro-directive...