Microwave Engineering Europe - November 2007 - (Page 33)

SAW FILTERS 33 Table 1: Differing materials offer tradeoffs among insertion loss, temperature stability, group delay, and other parameters. much higher performance and design simplicity than electronic ﬁltering. Filter manufacturers can work with system developers to create ﬁlters with an optimum set of characteristics for the application. Developers who understand the nature of the tradeoffs, however, will be able to achieve that optimum condition faster and with no unexpected byproducts of the design choices. Working with the IDT team IDT’s MicroNetworks Division, located outside Boston, Massachusetts, designs and manufactures SAW Filters (Surface Acoustic Wave Filters) utilizing advanced state-of-the- art semiconductor manufacturing techniques to meet the demanding criteria expected by their customers. Whether a design is geared to high volume commercial applications such as bandpass ﬁlters or diplexers to meet stringent operational and regulatory requirements, or more complex SOC hybrids combining SAW ﬁlters with various other devices in a single hybrid package to meet speciﬁc requirements and functionality, working with the IDT SAW Device Team requires just a call away to the local ﬁeld ofﬁce. Application engineers and our sales and marketing staff will ensure that a customer’s requirements will be given the highest priority through the speciﬁcation, design, and manufacturing cycle. the most stable, with no ﬁrst-order temperature-dependent variation but the highest insertion loss. Other materials offer insertion loss or less group delay at the cost of increased temperature sensitivity. Simulation Simpliﬁes Tradeoff Analysis While system designers should understand how SAW ﬁlter design choices affect various parameters, they do not need to try making these tradeoffs by trial and error. Customers working with vendor support, such as IDT’s team of worldwide ﬁeld applications engineers and factory engineers, can be assured that their requirements will be simulated through the design process. Such simulations provide customers with accurate performance estimates for various design choices. Knowing the types of tradeoffs that will be necessary, however, will help prevent system developers from deﬁning unachievable speciﬁcations. There are many other factors that SAW ﬁlter users may want to consider. One is power level. Because SAW ﬁlters depend on mechanical motion, there are limits to how much energy they can handle. Typical ﬁlters can handle as much as 1 W of signal energy, however, with special material doping, this limit can be extended. Packaging is another choice that must be considered. Often, package size is one of the ﬁrst parameters customers specify. Too strict a size limit, however, can constrain the ﬁlter cutoff slope, which is a function of device length, and may prevent the SAW device from ﬁtting into the desired package. While these many tradeoffs may seem daunting, SAW ﬁlters still offer Company Information IDT MicroNetworks Division www.idt.com NEWS RFS & Nokia Siemens Networks team-up for microwave solutions A selection of microwave antennas from Radio Frequency Systems (RFS) has successfully met rigorous product qualiﬁcation requirements, set by one of the world’s leading wireless communications corporations, Nokia Siemens Networks (NSN). Working closely with NSN, RFS has developed a range of single-polarised solid parabolic point-to-point microwave antennas, speciﬁcally matched to NSN’s outdoor units (ODU). The new NSN-approved antennas support 7 to 38 GHz frequency ranges in diameter sizes of two and four feet. The RFS antennas have been custom-developed to allow the NSN ODU to mount directly on to the back of the antenna, making inter-linking waveguide unnecessary. According to RFS Program Director NSN, Günter Mechsner, the antennas were subjected to a broad spectrum of performance tests in order to obtain approval. “The antennas satisﬁed a range of stringent mechanical performance criteria, including wind-speed, vibration and protection requirements, while still delivering optimised RF performance,” said Mechsner. In addition to carrying out practical tests on the RFS microwave antennas, NSN conducted a three-day on-site audit of RFS’s design and manufacturing procedures at the company’s microwave antenna manufacturing facility in Trignac, France. Many of the antennas were installed on ‘live’ transmission sites and subjected to the rigours of everyday wireless network operation. NSN-approved RFS microwave antennas are already being deployed globally. www.rfsworld.com Microwave Engineering ● November 2007 ● www.mwee.com 032_033_MWEE.indd 33 26/10/07 12:32:49 http://www.idt.com http://www.rfsworld.com http://www.mwee.com

Table of Contents Feed for the Digital Edition of Microwave Engineering Europe - November 2007

Microwave Engineering Europe - November 2007 Contents News Comment Metamaterials: Metamaterials Tackle Communications Wavelengths Microwave Components — EM tools: Microwave Component Design Easier With New EM and EDA Tools Cover Feature: RF Testing for OFDMA in LTE Base-Stations Startup Eyes Battery-Free Wireless Sensor Nets High-speed ADC Technology Paves the Way for Software Defined Radios Planning a WiMAX network: Maximising the ROI by Using Advanced Optimisation Tools Transporting Video Over Wireless Networks Ultrawideband Under the Gun Specifying the Proper SAW Filter Products Product Feature: RF Test Solution Supports Emerging 4x4 MIMO as Well as Multiple Commercial Standards Calendar

Microwave Engineering Europe - November 2007

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.