The Opportunities and Challenges of LTE Unlicensed in 5 GHz
David Witkowski, Executive Director, Wireless Communications Initiative
In 1998, the Federal Communications Commission established the Unlicensed National Information Infrastructure or U-NII 5 GHz bands. These are used primarily for Wi-Fi networks in homes, offices, hotels, airports, and other public spaces and also consumer devices. U-NII is also used by wireless Internet Service Providers, linking public safety radio sites, and for monitoring and critical infrastructure such as gas/oil pipelines.

MMD March 2014

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Band Reject Filter Series
Higher frequency band reject (notch) filters are designed to operate over the frequency range of .01 to 28 GHz. These filters are characterized by having the reverse properties of band pass filters and are offered in multiple topologies. Available in compact sizes.
RLC Electronics

SP6T RF Switch
JSW6-33DR+ is a medium power reflective SP6T RF switch, with reflective short on output ports in the off condition. Made using Silicon-on-Insulator process, it has very high IP3, a built-in CMOS driver and negative voltage generator.

Group Delay Equalized Bandpass Filter
Part number 2903 is a group delayed equalized elliptic type bandpass filter that has a typical 1 dB bandwidth of 94 MHz and a typical 60 dB bandwidth of 171 MHz. Insertion loss is <2 dB and group delay variation from 110 to 170 MHz is <3nsec.
KR Electronics

Absorptive Low Pass Filter
Model AF9350 is a UHF, low pass filter that covers the 10 to 500 MHz band and has an average power rating of 400W CW. It incurs a rejection of 45 dB minimum at the 750 to 3000 MHz band, and power rating of 25W CW from 501 to 5000 MHz.

LTE Band 14 Ceramic Duplexer
This high performance LTE ceramic duplexer was designed and built for use in public safety communication and commercial cellular applications. It operates in Band 14 and offers low insertion loss and high isolation to enable clear communications in the LTE network.
Networks International

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March 2014

Interconnect Advances Fuel
Technology Growth
By Orwill Hawkins, Vice President of Marketing
LadyBug Technologies

Liam Devlin, CEO, Plextek RF Integration

With increased frequencies, higher data rates, and lower noise levels, the microwave industry serves as a leader in technological capability. Demand for quality interconnects has increased right along with other higher-performance areas in the industry. Advances are made possible by state-of-the-art machining processes, new metallic and polymeric materials, and new engineering ideas. The rate of advance has been very rapid—in fact, it might be appropriate to plot the increased capability on a log scale.

We often take interconnects for granted. The reality is that a lot of effort by very capable engineers is put into creating cable, connectors, and finally, building a quality interconnect from the parts. A typical microwave test instrument will require many high-quality interconnects inside the unit. In modern equipment, connectivity is required on a circuit level, between boards, and between modules. Further, if we are to maximize the quality of our result, we cannot compromise connectivity outside of the instrument. Several interconnects may be required to connect our DUT and various devices such as power dividers, attenuators, directional couplers, etc.

Your Specs, Delivered Overnight
The connector, cable and supplier chain has responded to these requirements in typical modern day, total instant gratification form. Today it is possible to go online, order an interconnect system constructed with top quality cable and connectors of your own specification, and have it shipped to arrive tomorrow. Many of these cable suppliers have test capability and can verify the product’s performance over a very broad frequency range prior to shipment.

Microwave connector manufacturers have benefited from modern machining capabilities now available. Tighter tolerances increase performance, while faster production times contain cost. When LadyBug Technologies needed a long-reach Type-N connector, our supplier responded with a custom-manufactured connector at a reasonable cost. The connector design has a very good match, similar to that of high quality standard Type-N connectors, simplifying the match specification process. This was made possible by good engineering complemented by modern manufacturing equipment and techniques.

Materials, Metrology Important
Along with manufacturing processes, materials have played a significant part in the advancement in connectors and interconnects. The increased availability of high-quality metallic materials makes possible long-life connectors for a broad range of uses. Advances in polymeric materials allow better insulation and flexibility with a high degree of control over dielectric properties. Polymeric advances and manufacturing techniques also help to create tougher protective materials for the outer layers of cabling. These advances help increase cable flexibility while maintaining important RF properties.

In the Power Sensor area of the microwave industry, metrology is extremely important. Customers also demand high accuracy and long life. The choice in connectors plays a very important part in living up to customer expectations. To increase accuracy, Power Sensor users often prefer using sensors without connector savers or cables, making the power sensor manufacturer’s connector choice very important. Thanks to the many quality connector manufacturers in our industry, long-life, well-matched connectors are readily available.

LadyBug Technologies
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Uncertain Times for DefenseWill OpenRFM Shake Up the Microwave Industry?
By Barry Manz

Throughout the history of the RF and microwave industry there has never been a form factor standardizing the electromechanical, software, control plane, and thermal interfaces used by integrated microwave assemblies (IMAs) employed in defense systems. Rather, every system has been built to meet the requirements of a specific system, which may be but probably isn’t compatible with any other system. It’s simply the way the industry has always responded to requests from subcontractors that in turn must meet the physical, electrical, and RF requirements of prime contractors. Read More...

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