Passive Components

A New Type of Amplitude Equalizer for In-band Flatness Improvement

Presentation of a cascade amplitude equalizer used for improving the performance of a bandpass filter frequency response in cellular band
Technical Feature A New Type of Amplitude Equalizer for In-band Flatness Improvement There is a growing need in modern communication systems for low cost bandpass filters of small size, high selectivity and flat passband response in order to meet the demands for inter-channel power balance, and to avoid interference....
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Technology and Innovation in Single Layer Capacitors

Introduction to the buried single layer capacitor,™ a technologically advanced device manufactured for high frequency microwave applications
Application Note Technology and Innovation in Single Layer Capacitors Lambert Devoe and Alan Devoe Presidio Components Inc. San Diego, CA Single layer capacitors have been manufactured for many years for high frequency microwave applications. The simple parallel plate structure has advantages over multi-layer capacitors up to gigahertz frequencies due...
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2.5 V GaAs pHEMT Switches for GSM Handsets

A new line of 2.5 V GaAs pHEMT switches for GSM handsets is featured
Cover Feature 2.5 V GaAs pHEMT Switches for GSM Handsets M/A-COM Lowell, MA A new line of robust GaAs pHEMT switches for operation in 2.5 V GSM handsets has been developed. These switches feature performance that is unrivaled in the industry for harmonics at 2.5 V in addition to...
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Advanced Microwave Chip Capacitor Models

Use of accurate substrate-dependent chip capacitor models in computer-aided engineering software
Product Feature Advanced Microwave Chip Capacitor Models Modelithics Inc. Temple Terrace, FL Fig. 1 Measured S 11 of a 4.7 pF 0402 chip capacitor on different thickness FR4 substrates (series configuration). The use of computer-aided engineering (CAE) software by microwave printed circuit board (PCB) designers has become commonplace. These...
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Stainless Steel Coaxial Cable with Medium Loss at 36 GHz

Development of a high performance stainless steel coaxial cable with medium loss at 36 GHz
Product Feature Stainless Steel Coaxial Cable with Medium Loss at 36 GHz Fig. 1 Loss per 100 ft. vs. frequency. Anyone who has tried to use copper cable for high frequency connections in high stress environments knows that it does not hold up very well for long. Attempts to...
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A Broadband, Four-bit, Ka-band MMIC Phase Shifter

Introduction to the design, fabrication and measurement of a broadband, four-bit, GaAs phase shifter at Ka-band frequencies
Technical Feature A Broadband, Four-bit, Ka-band MMIC Phase Shifter A compact, robust and broadband, four-bit, Ka-band phase shifter was designed and fabricated in a standard 0.25 m m PHEMT GaAs process. Design trade-offs, simulation versus measured results and architectures for the various bits to achieve broadband performance are discussed....
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A High Efficiency, Low Cost Silicon Bipolar GSM Dual-band PA Module

Presentation of the design and measurement data for a PA module using silicon RF-IC bipolar chip technology on a simple ceramic substrate
Technical Feature A High Efficiency, Low Cost Silicon Bipolar GSM Dual-band PA Module T. Johansson, P. Lundin, J. Engvall and D. Uggla Ericsson Microelectronics AB Kista, Sweden U. Hagström Ericsson Microwave Systems AB Mölndal, Sweden As the wireless communication business continues to expand, there is great demand for reducing...
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Electronically Tunable Thin Film Filters for Microwave Applications

A new line of electronically tunable RF filters is featured
Cover Story Electronically Tunable Thin Film Filters for Microwave Applications Paratek Microwave Inc. Columbia, MD Interference in wireless systems increases bit error rate (BER) and decreases the reliability and quality of service of the communication network. Interference mitigation requires filtering of the transmitted and received energies to reject all...
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Dual Mode Broadband Hybrids: Theory and Experiment

Development of a theoretical approach to the control and optimization of the major parameters of side and top wall hybrid couplers
Technical Feature Dual Mode Broadband Hybrids: Theory and Experiment Alex D. Lapidus Microwave Communications Company International Inc. Valencia, CA A theoretical approach to both side and top wall (hybrid) couplers based on strong experimental work is developed. Broadband operation, related to dual mode propagation through the coupling section, is...
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Implementation of a Neural Network HEMT Model into ADS

An approach for implementing a neural network algorithm to develop a large-signal HEMT model into ADS
Technical Feature Implementation of a Neural Network HEMT Model into ADS Neural network algorithms have been applied to various areas of engineering and computer science. A high electron-mobility transistor (HEMT) large-signal model has been implemented in the Advanced Design System (ADS) software package using a multilayered neural network. The...
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