Manufacturing
Taking the computerized model, the final hardware is manufactured using high speed, high accuracy state of the art CNC machines. With extremely high tolerances Andrew are able to reproduce the design in many cases without the need for any post tuning. Eliminating tuning saves times and leads to a more reliable product in the field. Andrew is ideally suited to both low and high volume manufacture of filters with fast turnaround on customer specifications whilst producing high yield rates. Where most filters are specifically designed around customer specifications, Andrew has the capability to work with customers to offer a complete solution. New and innovative ideas are constantly being developed to increase efficiency of manufacture and to improve the lead time of design process.

Features
Particular features of the filters in Andrew's product range are the low insertion loss (typically less than 1.2dB), stability over a wide operating temperature range (130 deg) and the reliable long-term performance. Particularly stringent performance requirements can be accommodated, even at the highest operational frequencies.

Telelcommunications Filters
Andrew has been developing telecommunications filters for point to point and point to multipoint applications since 1998 and with over 50,000 in use around the world the company's expertise is renowned. Filters have been designed in many shapes and materials with a primary concern to efficiently produce and accurate and reliable filter. The filters are machined from copper or aluminum, then soldered or brazed together and finally plated or painted with a protective environmental seal. Each filter contains a series of irises and cavities in a precise configuration designed to meet the individual specifications.

Product Range
Typical frequency coverage is from 10 to 48GHz with particular emphasis on the microwave link bands centered around 13, 15, 18, 23, 26, 28, 31 and 38GHz. Development of filters outside these bands are possible and Andrew has the capability to design and test diplexers from 350MHz up to 75GHz.

Solutions
Andrew can also offer other communication components for radio links such as flexible waveguide to link the radio to the antenna and Hot stand by couplers to offer radio protection on key communication links. Also rigid waveguide assemblies, horn antennas, power splitters/combiners and diplexers. (Please refer to relevant data sheets for further information)

Required Ordering Information
In order to design and manufacture customized filters we need to know several key parameters. Please take note of the following list so that we can produce a solution for you.

Full Electrical Specification including the following

• Frequency of Operation
• Bandwidth
• Rejection
• Harmonic Rejection (If any)
• Insertion Loss
• Return Loss
• Group Delay Flatness
• Ripple Over Passband
• Operating Temperature Range
• Mechanical Outline
• Weight
• Environmental Constraints
• Quantities and Target Price

Transmit & Receive Path Diplexers

Design
Using specialized bespoke modeling software and high speed computing power, customized product development time scales are remarkably fast. By entering specification parameters onto a computer the complete model can be produced ready for drawing within hours. The accuracy and repeatability of this process is most important, and Andrew has developed and refined this over many years.

Manufacturing
Taking the computerized model, the final hardware is manufactured using high speed, high accuracy, state-of-the art CNC machines. With extremely high tolerances, Andrew is able to reproduce the design, in many cases without the need for any post tuning. Eliminating tuning saves time and leads to a more reliable product in the field. Andrew is ideally suited for both low- and high-volume manufacture of diplexers with fast turnaround on customer specifications and high yield. Where most diplexers are specifically designed around customer specification, Andrew works with customers for a complete solution. New and innovative ideas are constantly being developed to increase efficiency of manufacture and improve the lead time of the design process.

Features
Particular features of the diplexers in Andrew's product range are low insertion loss (typically less than 1.2 dB), stability over a wide operating temperature range (130 degrees) and the reliable long term performance. Particularly stringent performance requirements can be accommodated, even at the highest operational frequencies.

Telecommunications Diplexers
Andrew has been developing telecommunications diplexers for point-to-point and point-to-multipoint applications since 1998. The company has produced many variants that are at the heart of communications systems around the world today. Of primary concern is designing and effiiciently producing a pre-tuned, accurate, and reliable product. Very often a low pass filter is incorporated within the body to eliminate harmonic frequencies from interfering with the radio reception and transmission bands. Andrew diplexers can be machined from copper or aluminum, soldered or brazed together, and plated or painted to provide a protective environmental seal. Each diplexer contains a series of irises and cavities in a precise configuration designed to meet individual specifications.

Product Range
Typical frequency coverage is from 10 to 48 GHz with particular emphasis on the microwave link bands centered around 13, 15, 18, 23, 26, 28, 31 and 38 GHz. Development of diplexers outside these bands is possible, and Andrew has the capability to design and test diplexers from 350 MHz up to 75 GHz.

Solutions
Andrew offers other communication components for radio links such as flexible waveguide to link the radio to the antenna, hot standby couplers to protect the radio on key communication links, rigid waveguide assemblies, horn antennas, power splitters/combiners, and transmit/receive filters.

Required Ordering Information
Andrew will produce a solution for your application. To design and manufacture customized filters, we need to know several key parameters. Please take note of the following list so that we can produce a solution for you.

Full electrical specifications including:

• Frequency of operation
• Rejection bandwidth
• Harmonic rejection (If any)
• Insertion loss
• Return loss
• Group delay flatness
• Ripple over passband
• Operating temperature range
• Mechanical outline
• Weight
• Environmental constraints
• Quantities and target price

Broadband Wireless RF Filters & Diplexers

Andrew has developed a range of filters and diplexers for Broadband Wireless communications applications. Frequencies of operation range from 1900MHz to 15GHz. These products are particularly suited to OFDM and other Broadband Wireless Internet applications. Different duplex spacing and bandwidths are available. Customer specific requirements are accommodated in terms of size, mechanical configuration and connector type. Direct connection to circuit boards can also be accommodated. The range of filters covers band-pass, high pass, low-pass and band-reject types. Bandpass filters and diplexers can be combined with lowpass filters in order to provide good rejection to higher frequencies. Proprietary techniques can be incorporated if required in order to provide improved temperature stability. Andrew can combine filters and diplexers with other in-house developed electronic modules, in order to produce integrated subassemblies.

The special proprietary design and manufacturing techniques used in Andrew's filter, duplexer and diplexer products very repeatable performance for both small and large quantities. The following charts show typical measured performance data of a number of diplexers in the product range.

Performance of 3.5GHz MMDS (50MHz duplex spacing) Customer Premises Diplexer

Performance of 3.5GHz MMDS (50MHz duplex spacing) basestation Diplexer

Features

• Improved Temperature Stability
• Connector or Circuit board mounting
• Fast Delivery
• Reduced Total Cost
• ISO 9001 approved
• Frequencies from 1.9GHz to 15GHz