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Industry News

A Simplified Method to Reduce Dimensions of Planar Passive Circuits Using Defected Ground and Defected Microstrip Structures

In this work, a simplified and accurate mathematical method to predict the reduced dimensions of microstrip circuits by using planes with discontinuities such as defected ground structures (DGS) and defected microstrip structures (DMS) is proposed. The...
The use of discontinuities in ground planes or in microstrip lines is currently employed to improve the performance of different passive circuits, such as the size reduction of amplifiers, 1 the enhancement of filter characteristics 2,3 and applications to suppress harmonics in patch antennas. 4 On the other hand,...
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Filtering Capacitors Embedded in LTCC Substrates for RF and Microwave Applications

This article presents a new solution to build filtering capacitors embedded in low temperature co-fired ceramic (LTCC). A new low loss high-k dielectric (K = 80) tape compatible with DuPont low-k tapes has been developed and used in order to demonstrat...
With the continuous trend to reduce the size of electronic modules and increase the integration levels, the integration of passive elements within the interconnection board or substrate becomes more and more a key factor. In addition to size reduction, passive integration leads to assembly cost reduction as well as...
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A Miniaturized GaAs MMIC Bandpass Filter for the 5 GHz Band

A novel, miniaturized, GaAs-based bandpass filter for the 5 GHz WLAN band, using coupled lines end-shorted at their opposite sides and lumped capacitors, is proposed. The new filter has a compact size, as small as a few electrical degrees, and shows a ...
In modern wireless communication systems, miniaturized MMIC microwave bandpass filters are required to reduce the cost and decrease the RF system design time, especially for a single RF transceiver chip. Therefore, many studies on reducing the large size of conventional bandpass filters have been made. The lumped element approach,...
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A CPW-fed Rhombic Antenna with Band-reject Characteristics for UWB Applications

In this design, a novel rhombic CPW-feed antenna is presented to achieve broadband operation. The antenna has dimensions of 28.5 x 17.0 x 0.8 mm and has good radiation characteristics. The proposed antenna uses a coplanar waveguide feed line with a rho...
Recently, there has been much research on broadband and multi-band antennas for various wireless communication systems. The ultra-wideband (UWB) regulation released by the Federal Communications Commission (FCC) in 2002, “UWB Technology,” holds great promise for a vast array of new applications that have the potential to provide significant benefits...
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A Power Amplifier MMIC Using CPW Structure Technology

This article presents the performance of a two-stage X-/Ku-band microwave monolithic integrated circuit (MMIC) power amplifier using a 0.15 mm gate length InGaP/InGaAs E-mode pseudomorphic high electron mobility transistor (PHEMT) and a coplanar wavegu...
Communication systems in the RF band are becoming bandwidth limited. Thus, the providers of communication systems have become interested in the X-/Ku-band for the next-generation of terrestrial systems, such as satellite communications, wireless local area networks (WLAN) and local multipoint distribution systems (LMDS). The performance of high power amplifiers...
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Circuit Modeling of Spurline and Its Applications to Microstrip Bandstop Filters

Simple bandstop filters (BSF) are introduced in this article. The filters consist of one spurline and a pair of cross-junction open stubs. This spurline exhibits bandstop characteristics at a resonant frequency, which can be explained and modeled by on...
Bandstop filters (BSF) play an important role in rejecting higher harmonics and spurious responses for microwave and millimeter-wave applications. The conventional method to implement bandstop filters involves the use of shunt stubs or stepped-impedance microstrip lines with large circuit size. 1 To reduce the filter area, certain slow-wave structures,...
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RF and Microwaves in Asia: Technological and Economic Diversity

Asia’s prominence and influence in the global marketplace continues to grow. This article considers the role that RF and microwave technology plays, its development and global impact.
In the commercial and technological arena, Asia is the continent that elicits strong opinions and provokes debate. Is it an all-consuming predator with an insatiable appetite, sustained by low-cost mass production, intent on devouring the lion’s share of the market? Or is it the goose that will lay and...
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Mercury Computer Systems Selected by Raytheon

Mercury Computer Systems Inc. announced that it was selected by Raytheon to provide the wideband modem subsystem platform as part of Raytheon’s recent HDR-RF Ground Modem contract from the US Air Force. Raytheon worked with Mercury Computer Systems to leverage the benefits of commercial off-the-shelf (COTS) software radio processing...
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