摘要:
An RF device includes a substrate (502) formed of a low temperature co-fired ceramic (LTCC). A cavity structure, such as a conduit (508) can be provided within the substrate with at least one fluid dielectric contained within the cavity structure. The RF device can also include a piezoelectric structure (504) for concurrently applying agitation force to the fluid dielectric in at least two opposing directions. The opposing directions can include substantially all directions normal to an interior surface defining a fluid conduit over a selected length of the fluid conduit.
摘要:
Method for preventing degradation of a fluid dielectric (106) in an RF device (100). The method can include the steps forming a substrate (102) of the RF device (100) from a low temperature co-fired ceramic (LTCC), positioning within a cavity structure (104) of the substrate (102) at least one fluid dielectric (106), and agitating the fluid dielectric (106) with a piezoelectric device (112). According to one aspect of the invention, the piezoelectric device (112) can be formed from lead zirconate titanate.
摘要:
A printed circuit (100) for processing radio frequency signals includes a substrate (110) including substrate regions (101, 103, 105, 111, and 119) upon which the printed circuit can be placed. The circuit is a lowpass filter including a transformer line section (112), at least a first stub section (114 or 116), and transmission line sections (117) interconnecting the transformer line section with at least the first stub section. The transformer line section, the transmission line sections, and at least the first stub section are coupled to respective substrate regions that have substrate characteristics that are each independently customizable. The circuit further comprises at least one ground or ground plane (120) coupled to the substrate.
摘要:
An RF filter that includes a substrate having a plurality of regions, each having respective substrate properties including a relative permeability and a relative permittivity. At least one filter section is coupled to one of the regions of the substrate which has different substrate properties in comparison to other regions. Other filter sections can be coupled to other substrate regions having different substrate properties. The permeability and/or permittivity can be controlled by the addition of meta-materials to the substrate and/or by the creation of voids in the substrate. The RF filter can be a stepped impedance filter. One filter section includes a transmission line section having an impedance influenced by the region of the substrate on which the filter section is disposed. The transmission line section construction can be a microstrip, buried microstrip, or stripline. A supplemental layer of the substrate can be disposed beneath the filter section.
摘要:
A printed circuit for processing radio frequency signals includes a substrate including substrate regions upon which the printed circuit can be placed. The circuit is a coupled line filter including a plurality of resonator elements. The plurality of resonator line elements are at least partially coupled to respective substrate regions that have substrate characteristics that are each independently customizable. The circuit further comprises at least one ground or ground plane (50) coupled to the substrate.
摘要:
A printed circuit array of log periodic dipole arrays (LPDA) where each LPDA includes dipole elements with arms having reduced size through use of high effective permittivity substrate portions. The radiation efficiency degradation generally associated with use of a high permittivitty substrate can be be reduced through addition of magnetic particles to provide enhanced permeability in the high permittivity regions. The substrate preferably includes meta-materials. The feed line can provide a broadband transformation by being configured as a plurality of segments having quarter wave electrical lengths.
摘要:
A printed circuit antenna with broadband input coupling is disclosed. An elongated conductive antenna element arranged in the form of a loop is disposed on a dielectric substrate formed on a ground plane. The antenna element has first and second adjacent end portions separated by a gap. The second end portion is connected to the ground plane. An input coupler is provided for matching an input impedance of the antenna to the antenna feed circuitry. The input coupler can comprise a conductive line disposed on the substrate adjacent to the antenna element. The conductive line is separated from the antenna element by a coupling space for coupling to the antenna element an input signal applied to the input coupler. The conductive line extends parallel to a portion of the antenna element including the first end portion. The arrangement has the advantage of having an input impedance that is relatively insensitive to adjustments affecting the antenna center frequency.
摘要:
A method for embedding optical band gap (OBG) devices in a ceramic substrate (100). The method includes the step (320) of pre-forming an OBG structure (105). The OBG structure can be a micro optical electromechanical systems (MOEMS) device. Further, the OBG structure can be preformed from indium phosphide and/or indium gallium arsenide. The method also includes the step (325) of coating the OBG structure with a surface binding material (230). The surface binding material can be comprised of calcium and hexane. The ratio of the calcium to hexane can be from about 1% to 2%. At a next step (330), the OBG structure can be inserted into the ceramic substrate. A pre-fire step (335) and a sintering step (340) then can be performed on the substrate.
摘要:
A slot fed microstrip antenna (100) provides improved efficiency through enhanced coupling of electromagnetic energy between the feed line (117) and the slot (106). The dielectric layer (105) between the feed line (117) and the slot (106) includes magnetic particles (114), the magnetic particles (114) preferably included in the dielectric junction region (113) between the microstrip feed line (117) and the slot (106). A high dielectric region is preferably also provided in the junction constant to further enhance the field concentration effect. The slot antenna (100) can be embodied as a microstrip patch antenna (200).
摘要:
A slot fed microstrip patch antenna (200) includes an electrically conducting ground plane (208), the ground plane (208) having at least one coupling slot (206) and at least a first patch radiator (209). An antenna dielectric substrate material (205) is disposed between the ground plane (208) and the first patch radiator (209), wherein at least a portion of the antenna dielectric (210) includes magnetic particles (214). A feed dielectric substrate (212) is disposed between a feed line (217) and the ground plane (208). Magnetic particles can also be used in the feed line (217) dielectric. Patch antennas according to the invention can be of a reduced size through use of high relative permittivity dielectric substrate portions, yet still be efficient through use of dielectrics including magnetic particles which permit impedance matching of dielectric medium interfaces, such as the feed line (217) into the slot (206).