The Microwave Filter and Switch Device

Universitat Politècnica de València Background
The modern communication systems of ground and space applications require microwave hardware that is increasingly flexible. In particular, microwave switches and filters are key components for the input and output networks of the modern communication systems. The switching is currently primarily done through a switching device, which is followed by a filter to carry out the filtering process, where both are separate.
Technology Overview
The microwave filter and switch device that is the subject of the invention allows implementing two functions with one single piece of equipment that until now have been carried out by implementing two separate devices. These two functions are filtering and switching microwave signals.
The microwave filter and switch device is based on the use of a Tuning and Detuning Pin (TDP).
The filtering and switching are achieved by making use of a series of modified tuning pins, which allow canceling the activity of at least one resonator in which they are located. This allows being able to selectively cancel one or more resonators, resonant cavities, allowing the same resonant cavity to act as part of a filter or switch by completely disabling the filter ( ).
The Tuning and Detuning Pin (TDP) is a device that has two states. The first can be used to tune a cavity to the desired resonance frequency. The second can be used to completely detune the cavity, in such a way that the filter no longer carries out the original filtering function.
The Tuning and Detuning Pin (TDP) is comprised of three parts:

The is a pin of the required size that has a hole in the center and can be used to tune a waveguide resonator to the desired resonance frequency.
The is used to attach the tuning element, such that the penetration of the desired tuning is ensured and maintained over time despite variations in the ambient conditions (vibration, etc.).
The can then be inserted into the central hole of the tuning pin. Inserting the detuning pin a sufficient length can completely detune the resonator in question, in such a way that the filter does not function as it was originally intended.

The Tuning and Detuning Pins (TDP), like the tuning elements of the filter (pins or nuts), are typically inserted in the center of the cavity. The penetration of the tuning pin inside the cavity is adjusted to set the resonance frequency of the resonators to the required value. After the tuning, the tuning pin is fastened by tightening a locking nut against the exterior metal surface of the filter. By using the TDP, one same resonating cavity can be made to function as part of a filter, or to completely disable the filter.
The tuning and detuning pin can be used in microwave filters based on metallic microwave guides to make microwave filters integrated with switches, in addition to reconfigurable microwave filters.
The configuration can be done manually or mechanically, thus extending the range of application to the satellite payloads and the hardware controlled remotely for grounding applications.
Stage of Development: Laboratory Prototype

The main advantage offered by the invention is the flexibility of the tuning/detuning device proposed, given that it can be used to tune/detune both the resonating cavities and the attachment openings (which are basic elements of filters and many other passive elements).
The TDP can be used for the practical implementation of reconfigurable filters and/or switches (including a filtering response in frequency).
Simple and compact device.
Saves space and resources, given that implementing two separate elements for carrying out the two functions described is not required.
The structure can be manufactured with standard, low-cost milling processes.


The microwave filter and switch device is for telecommunications and is intended for telecommunications satellites, especially passive components for payloads of communications, in addition to RF front end in base stations of mobile communications.
It can be used in any application that requires the use of filters and/or switches (including a selective frequency behavior).

The inventors are looking for companies interested in establishing patent license agreements for its use, manufacture or sale.

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