Novel types of narrow band filters based on the newly introduced gap waveguide technology are presented in this paper. The proposed have a central frequency 35 GHz with approximately 1% fractional bandwidth. filter resonators composed two separate plates and manufactured by milling metallic blocks. between eliminates need for electrical contact them. This feature allows to be stacked different layers. filtering function is realized producing coupling resonators. measurement results good...

A novel substrateless power amplifier module realized by ridge gap waveguide (RGW) technology is proposed in Ka-band. Up to our knowledge, this the first time that an active device directly integrated with RGW structure. No substrate used RF section of implemented and whole structure made machining a piece metal. The was two pieces easily assembled without needing precise contact between sections. cavity resonance suppressed using pining fabricated self-packaged does not need any packaging....

This paper presents a double input-double output bilateral low-pass equivalent amplifier behavioral model that takes into account input source and load termination mismatches. The is intended for the system-level simulation of chains subjected to wideband modulated signals, since it can predict device's scattered waves their memory effects, in wide range voltage standing wave ratios (VSWR). In addition, extraction methodology, its associated laboratory test bench are discussed, noting...

A low-drift optoelectronic oscillator (OEO) is developed and experimentally shown. In the proposed OEO, a fiber Sagnac interferometer, including an optical phase modulator (PM) nonreciprocal bias unit, functions as intrinsically drift-free intensity modulator. The noise of OEO modeled in space, which verified by experiments. Phase frequency stability photonically generated microwave signals are measured. single-sideband signal -106.6 dBc/Hz at 10-kHz offset from 10.833-GHz carrier, with...

In this paper, a modified method based on the frequency discriminator technique for measuring phase noise of microwave oscillators is presented. proposed method, shifter omitted. contrast, 90° hybrid with one more channel containing detector, and low-noise amplifier added to measurement setup. It can be said that an in-phase/quadrature phase-noise detection has been developed. With tuning variable not needed anymore. Therefore, done automatically, as result, time decreased. Another...

We propose and theoretically experimentally demonstrate a novel tunable spurious-free single-loop optoelectronic oscillator (OEO) with low drift low-phase noise. In the proposed transposed-frequency OEO (TF-OEO), nonreciprocal bias unit an optical phase modulator in fiber Sagnac interferometer function jointly as intrinsically drift-free intensity modulator, which improves long-term drift. Besides, low-noise filtered amplifier is used replaces conventional radio frequency (RF) bandpass...

A new broadband frequency discriminator is introduced for demodulating the modulated signals in microwave range. Direct demodulation with no need tuning center of resonance circuits most important advantage proposed technique. This technique uses in-phase/quadrature demodulation, some manner, without using any additional local oscillator down conversion. Simulation demodulator has been done Advanced Design System software to evaluate and predict system behavior. setup based on method was...

In this paper an analytical formulation based on the conversion matrix approach for characterizing oscillator noise spectra as well phase and amplitude a single-loop optoelectronic (OEO) is presented. The validity of verified by comparing our results regarding OEO against two references in literature. first reference presents simulation results, second both measurement good agreement seen between new method those references. advantage simplicity theory systematic nature analysis, which can...

A half power divider using ridge gap waveguide technology is realized in millimeter wave frequencies. By machining a piece of metal the was fabricated. There no need to an electrical connection between constitutive parts. The fabricated self-packaged. Cylindrical pins are used structure for ease fabrication. Low loss division and good isolation ports measured. Also measured impedance matching acceptable. Good agreement simulation measurement achieved.

We use a nonlinear analytic approach to predict the main oscillation mode power and spurious levels in ultrapure microwave optoelectronic oscillators (OEOs). This takes into account N simultaneously falling inside RF filter bandwidth calculates all dominant InterModulation Products (IMPs) that fall fundamental zone. show photonic links exhibit capture effect. By considering this effect, we derive analytical expressions govern behavior of OEOs steady state. find when small-signal open-loop...

The interinjection locking of microwave oscillators is investigated using differential equations governing the behaviour two mutually coupled oscillators. before and after described, common oscillation frequencies, range transient time constant are calculated. spectra in unlocked condition also investigated, with particular attention to spacing amplitude variation spectral lines. Experimental results connection theoretical investigations presented.

We introduce the capture effect concept in microwave photonic links (MWPLs) for first time to our knowledge. The or small-signal suppression is change amplitude ratio of two signals between input and output intensity-modulation direct-detection (IMDD) MWPLs. An analytical explanation performance external IMDD MWPLs due effects nonlinearity combined with sum several sinusoidal given. have investigated a weaker signal these links. General analytic expression derived using nonlinear approach....

In this paper the Contour Integral (CI) method is applied to design and analysis of substrate integrated waveguide (SIW) filters. This used for planar structures based upon discretization boundary structure needs less memory than full wave methods. For decreasing computation time, circular vias replaced by square ones. A four pole Chebyshev X band dual inductive post filter designed using technique results are compared with measurements simulation software Ansoft HFSS. Good agreement seen...

This work discusses several extraction procedures for the recently proposed dual input-dual output (DIDO) low pass equivalent behavioral model according to their required excitation signals. These methods are based on passive load pulling and uncontrolled open loop active but with different type of waveforms. It also addresses hardware signal conditioning in detail. The performance discussed compared datasets extracted from simulation results ADS. show that use load-pulling can enhance...

A hybrid method is introduced for analysis of the H-plane waveguide discontinuities.It combines multimode contour integral and mode matching techniques.The process based on dividing circuit structure into key building blocks finding scattering matrix each block individually.The whole can be found by cascading these blocks.Also developed multi-media circuits.Therefore, it possible to analyze filters with dielectric resonators using this method.The accuracy run time purposed compared those...

A Green's function to describe the time behavior of locking phases in a circular planar array mutually coupled microwave oscillators is proposed. Using this dynamic can be described for any arbitrary free running frequency elements oscillator array. Beam steering realized via detuning edge from reference and beam direction controlled by amount each at edge. Some functions such as sinusoidal, triangular rectangular ones have been applied and, resulting patterns are compared with one another....

The noise performance of intensity-modulation direct-detection microwave photonic links (MWPL) operating under large-signal conditions has been studied in this paper. A sinusoidal signal plus narrowband white Gaussian is applied at the radio frequency input link, and output spectrum derived using a nonlinear analytical approach. We show that SNR can be severely affected by interaction due to nonlinearity MWPL combined with large modulating signal. It shown figure (NF) an depends on power,...

Phase noise in two mutually coupled oscillators is analyzed by the describing function method, and after-lock phase of calculated terms their free-running noise. A new phase-noise measurement technique based on inter-injection locking similar proposed. Experimental results are presented, which confirm theory. It shown that case zero coupling coefficient, system optimum state where only required parameter for bandwidth. In this state, as far bandwidth measured correctly, imperfections such...

Abstract An ultrabroadband power amplifier using 16‐way spatial divider/combiner that a quasi‐TEM‐guided wave structure is designed. oversized coaxial waveguide was used as the host of dividing/combining circuits incorporates an antipodal finline array. Galerkin's technique in spectral domain to analyze finline. The TEM‐guided and transitions were designed theory small reflection near optimum design. A high 16 monolithic‐microwave integrated‐circuit amplifiers built. measured results show...

The conventional delay-line discriminator method for phase noise measurement is modified to achieve better sensitivity. In the proposed technique, decrease loss, under-test oscillator's microwave frequency down-converted by another oscillator, and implemented in IF range. Full validation of technique presented. adition, we experimentally demonstrate that system sensitivity considerably improved compared method.

In this paper a new method for measuring phase noise of microwave oscillators based on delay line frequency discriminator is proposed. Elimination shifter the major advantage technique over traditional technique. By using technique, manual or electronic tuning to reach quadrature at detector input ports not needed anymore. A 90-degree hybrid used in and another path including LNA added. Finally by dual channel FFT analyzer performing some processing sampled data two channels, oscillator will...

The main idea of this paper is to find an analytical formula for the input conductance elevated ferrite film circu-lator match it systematically desired matching network. For solving loaded dielectric resonator included in stripline circulator, off diagonal components permeability tensor are taken as perturbation. electromagnetic fields computations done unperturbed structure. dipolar resonant frequencies corresponding harmonics modes then calculated using perturbation integrals. quality...

In this study, the authors investigate effect of random free‐running frequency distribution oscillators in two‐dimensional (2D) coupled oscillator arrays (COAs) on phase error elements, and consequently beam‐pointing angle array. They derive an analytic formulation for standard deviation (BPE) terms statistical parameters frequencies elements array configuration. The results show that order to decrease BPE 2D COAs, one can use COAs with a larger size (greater number elements) oscillators.

in this paper the phase distribution an array of coupled oscillators arranged on a circular surface is discussed. Coupling considered to be weak and each oscillator its four nearest neighbours. In continuum limit where number goes infinity theoretical formulation polar coordinates proposed describe dynamic behaviour phases elements. A Green's function for terms normalized eigenfunctions. Beam steering can done via detuning edge oscillators.