A cavity resonator or filter constructed on electromagnetic bandgap (EBG) substrate is provided that includes an external controlling assemble having a plurality of components configured to change a working frequency of the cavity resonator or filter. A dual-band bandpass filter is provided that includes two or more single band filters on a single EBG substrate and an external controlling assemble having a plurality of components configured to change a working frequency of the cavity resonator or filter.

This document describes techniques and systems relating to isolation slots for an antenna and printed circuit board (PCB) interface of a radar system. For example, isolation slots may be etched on a metal surface layer of a PCB for a radar control module on each side of each transmission line (e.g., microstrip line) that forms an array of channels (e.g., transmit channels, receive channels). When the PCB and an antenna structure are mated, a gap exists along the mating plane in which energy leakage between the channels can occur. The isolation slots create a stop band for a certain range of frequencies of interest and may reduce this energy leakage even when the gap is uneven along the mating plane. The isolation slots may be relatively easy and inexpensive to manufacture. The gap along the mating plane is not required to be constant, further simplifying the manufacturing process.

Radio-frequency devices that include metamaterial structures are provided. Inclusion of resonator sections in a structure enables the utilization of desirable line segment widths without sacrificing performance, and further enables a reduction in the amount of space or area taken up by such devices on a printed circuit board.

Disclosed is a single notch filter, comprising a dielectric layer, a first metal layer and a second metal layer, wherein the first metal layer and the second metal layer are arranged onto two opposite surfaces of the dielectric layer, the first metal layer comprises a metal microstrip patch, the second metal layer comprises a coplanar waveguide plate and a metal grounding plate, and a fractal defected ground body of the coplanar waveguide plate is coupled with the metal microstrip patch based on the dielectric layer. Other embodiments are described and claimed.

A medical device as described herein includes a communication module to process radio frequency signals associated with operation of the medical device, an antenna associated with the communication module, and a microstrip transmission component coupled between the communication module and the antenna. The transmission component includes a dielectric substrate, an electrically conductive signal trace formed overlying the upper major surface of the substrate, an electrically conductive ground plane formed overlying the lower major surface of the substrate, and a complementary split ring resonator arrangement integrally formed in the ground plane, and having a layout and dimensions tuned to cause the resonator arrangement to resonate at one or more harmonic frequencies of the nominal transmission frequency of the radio frequency signals.

Aspects and examples provide improvement in the attenuation level near the passband within the stopband of the bandpass-type filter using a ladder-type circuit formed by a BAW resonator. In one example the filter includes a ladder-type circuit formed by a bulk acoustic wave (BAW) resonator, and a loop circuit connected between two distinct points on a signal path extending from an input to an output of the ladder-type circuit for phase-cancellation of signals at the two distinct points. The two distinct points may be the input and the output of the ladder-type circuit. The loop circuit may include a SAW resonator or a BAW resonator. The BAW resonator may be a film bulk acoustic resonator (FBAR) or solidly mounted resonator (SMR).

It is an object of the present invention to provide compact filter-antennas disposed in multilayer substrates. A filter-antenna disposed in a multilayer substrate comprising: a radiating element formed as a patch antenna; a resonant element disposed under the radiating element, including a signal via and ground vias surrounding the signal via and functioned as a filter; and a feed transmission line connected to the radiating element.

At least some aspects of the present disclosure feature a waveguide for propagating an electromagnetic wave. The waveguide includes a base material and a plurality of resonators disposed in a pattern, the plurality of resonators having a resonance frequency. Each of the plurality of resonators has a relative permittivity greater than a relative permittivity of the base material. At least two of the plurality of resonators are spaced according to a lattice constant that defines a distance between a center of a first one of the resonators and a center of a neighboring second one of the resonators.

A multifunctional electromagnetic structure is presently disclosed. Said structure is a true electromagnetic bandgap (EBG) material, with both surface and leaky waves suppressed from the whole structure along all lateral directions. It is also an antenna element, configured to radiate to the broadside direction. The structure has two metallization layers of concentric rings between a square-shaped radiating top metal layer and a bottom ground plane. The lower concentric ring is connected to the ground plane through a plurality of vias, while the patch of the top metal layer is fed with a probe. The EBG unit cells may be used as antenna elements in a phased array environment, where they eliminate scan blindness from the array structure along all scan directions.

An antenna assembly for use in a tile architecture antenna system. The antenna assembly comprises: i) a first substrate layer having a first surface; ii) a first antenna disposed in an X-Y plane on the first surface of the first substrate layer; iii) a second substrate layer having a first surface, the second substrate layer displaced in the Z-direction with respect to the X-Y plane on the first surface of the first substrate layer; and iv) a first tuning balun disposed on the first surface of the second substrate layer and coupled to the first antenna by means of a first feed via. The antenna assembly further comprises a first transmission line disposed on the first surface of the second substrate layer. The first transmission line is coupled to the first antenna by means of a second feed via.