The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For the first time, a rectangular waveguide (RWG) isolator realized through inkjet printing on a ferrite substrate is presented. Yttrium iron garnet (YIG) substrate is used for the realization of the ferrite-filled isolator. Contrary to the substrate integrated waveguide (SIW) approach, all four walls of the waveguide have been inkjet printed on the YIG substrate demonstrating the utility of inkjet...
This paper presents micromachined planar coaxial probes integrated with the active circuits for tumor detection and low-power cancer ablation. A multi-state reflectometer (MSR) consisting of a dual-band PLL, an impedance tuner, two power detectors, and a directional coupler is employed to extract broadband dielectric parameters of the tumor cells. The active circuits are integrated on the micromachined...
This report describes a Ku-band amplifier GaN MMIC. The amplifier MMIC delivers a measured saturated power of 20 W and gain of 20 dB under CW operation. To enhance the linearity of the two stage amplifier composed of the MMIC and GaN Internally Matched FET, a diode linearizer has also been built into the MMIC. The linearizer offers 5dB better linear output power, defined the output power at IM3 of...
A multi-tap microwave photonic filter (MPF) with its center frequency tuned by a single parameter is proposed and demonstrated based on polarization modulation. By simply adjusting the amplitude of a sawtooth wave signal to a polarization modulator, the MPF is tuned with the shape and the free spectral range (FSR) unchanged. The proposed system has advantages in terms of simple operation, fast tunability...
A magnetic tunnel junction (MTJ)-based microwave detector is proposed and investigated. When the MTJ is excited by microwave magnetic fields, the relative angle between the free layer and pinned layer alternates, giving rise to an average resistance change. By measuring the average resistance change, the MTJ can be utilized as a microwave power sensor. Due to the nature of ferromagnetic resonance,...
This paper presents a 20 GHz low noise amplifier (LNA) with notch filtering from 27.5 GHz to 31 GHz in a 0.25 µm SiGe:C BiCMOS technology. Notch filters are proposed to be implemented at different stages to have minor impact on the noise figure (NF), while achieving high attenuation around 30 GHz. In comparison with a reference LNA without filtering, it achieves overall filtering of more than −30...
Extraction of Volterra based nonlinear system's models can be hindered by conditioning problems. This is especially true when working with low precision arithmetic, typical of hardware implemented DPD systems. Traditionally, monomials are chosen as the basis functions because they are continuous and easy to manipulate, although other bases could be used. Spline bases, for example, have been chosen...
We discuss the development of a wideband LDMOS Doherty PA (DPA) with optimized peak power and efficiency over 550 MHz to 770 MHz of bandwidth. The design was enabled by a wideband output combiner which involves multisection impedance transformation. The DPA delivers more than 46% average efficiency across the band at 48 dBm average power supporting DVB-T signal with 8 MHz bandwidth and PAPR of 10...
This paper presents a performance evaluation of GaN X-Band power amplifiers operating as self-synchronous rectifiers. Two single-stage MMIC power amplifiers are characterized under continuous wave conditions at 10.1GHz. One PA is designed with a single 10 × 100µm HEMT in a 0.15µm GaN process, while the other contains two 10 × 100µm power-combined devices. The MMICs exhibit 67% and 56% power added...
The design and development of a Liquid Crystal Polymer (LCP) low noise amplifier module with an integrated waveguide input at Ka-band is presented. The LCP module houses two low noise amplifiers and an integrated band-pass filter. The integrated waveguide input transition to a microstrip achieves a measured insertion loss of 0.2 dB to 0.3 dB from 27 to 31 GHz. The LCP module has a measured noise figure...
This paper presents a linear chirp generator for synthesizing ultra-wideband signals for use in an FM-CW radar being used for airborne snow thickness measurements. Ultra-wideband chirp generators with rigorous linearity requirements are needed for long-range FMCW radars. The chirp generator is composed of a direct digital synthesizer and a frequency multiplier chain. The implementation approach combines...
This paper presents the design and the measured results of two GaN power amplifiers designed to operate from 30 MHz to 2.7 GHz. One design is a fully integrated non-uniform distributed power amplifier (NDPA) MMIC. NDPA achieves typical small signal gain of 20 dB and produces 10W of output power with 50% or better PAE across the frequency band. The other design is a hybrid discrete packaged amplifier...
A five-stage linear low-noise uniform traveling wave amplifier (L2NTWA) design fabricated in an AlGaN/GaN 0.25µm monolithic microwave integrated circuit (MMIC) process is presented. The amplifier exhibits a bandwidth of 10 MHz − 6.5 GHz at a constant gain of 15 dB and a minimum NF of 1.5 dB. For small-signal operation only, an on-chip active cold load (ACL) can be optionally connected by a bond-wire...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.