AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Active rf isolator9/24/2023 The researchers explored the use of a distributed-element circuit approach based on a commercial GaAs FET active device to achieve an active quasi-circulator with bandwidth of 0.8 to 2.2 GHz. A combined wideband tunable quasi-circulator was developed that provides high isolation between ports while also operating over a large bandwidth.Įach active circulator design approach had strengths and weaknesses, with the most wideband configurations lacking enough isolation and tunable active circulators providing high isolation but lacking bandwidth. Much attention is given to active quasi-circulator designs, along with several wideband and tunable circuit configurations. The researchers examined different active circulator design approaches, including three-way circulators in which signals flow from an input port to two output ports and quasi-circulators, where signals flow from an input port to one of two output ports but are isolated from the other port, as required when connecting an antenna to a transmitter and receiver. Researchers from Hong Kong have investigated the development of active circulators that will allow the flow of RF/microwave energy only in one direction in support of many different wireless radio architectures, including in software-defined-radio (SDR) systems for coverage of many different frequency bands with a single radio. But what if RF/microwave circulators were designed as active components?Ĭirculators allow the simultaneous transmission and reception of high-frequency signals at different frequencies, a key capability in enabling the high-volume use of radio waves in a growing number of wireless communications applications, including in 5G wireless cellular networks. Some passive loss is to be expected, and usually such loss is one of the limiting factors in determining the power-handling capability of a passive circulator. Using Molex patented technologies, very wide band devices can be achieved in relatively small packages.RF/microwave circulators are usually passive components, typically based on ferrite substrate materials and often called upon to direct high-power signals in high-frequency systems. Customers would like to combine multiple bands in order to have a more flexible radio system. New radio designs actively require very wide bandwidth devices in a single radio. Proper design through the application of Molex expertise, along with optimized selection of materials and dimensions, results in acceptable IMD and harmonics performance with proper frequency bandwidth to meet customer expectations. Low IMD usually requires larger isolators and circulators and thicker dimensions. Low IMD is very important in systems and are not easily achieved in smaller devices. Molex engineers select raw materials with appropriate properties, including the required operating temperature range. Using high power increases temperature and, therefore, degrades performance. Power handling is very dependent on the circulator’s mechanical design and ferrite material properties. Combining our experience with our patented technologies, Molex can provide isolators and circulators as small as 6mm while meeting customer requirements. It is very challenging to meet required specifications such as those pertaining to insertion loss, return loss, power, IMD (passive intermodulation) and temperature stability in a small isolator and circulator package. Molex has invested in the development of high-efficiency, flexible automated manufacturing equipment to produce high-production-volume isolators and circulators. It requires very special customized equipment with significant investment. Automation equipment for isolators and circulators is not common.
0 Comments
Read More
Leave a Reply. |