Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.

Abstract: A cavity filter device includes a micro-strip structure comprising a low dielectric organic material forming a printed wiring board. The printed wiring board may be soldered, welded, or adhered to the base of one or more cavity filters. The cavity filter may include a coupling pin such as a RF pin positioned at the base of the filter. The micro-strip structure may be configured to carry a RF signal from the input, across the micro-strip structure to the RF pin positioned at the base of the filter.

Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.

Abstract: A high power, low passive inter-modulation capacitor is presented, which is formed using metal clad substrates, which are broad-side coupled through a thin air gap. Each substrate may include metal layers affixed on both sides which are electrical coupled together to form a single capacitor plate, or each substrate may have only a single metal layer on the surface adjacent to the air gap. The capacitor has particular application in low cost RF and microwave filters, which may be used in communication equipment and communication test equipment such a diplexers, for low PIM applications.

Abstract: A cavity filter device includes a micro-strip structure comprising a low dielectric organic material forming a printed wiring board. The printed wiring board may be soldered, welded, or adhered to the base of one or more cavity filters. The cavity filter may include a coupling pin such as a RF pin positioned at the base of the filter. The micro-strip structure may be configured to carry a RF signal from the input, across the micro-strip structure to the RF pin positioned at the base of the filter.

Abstract: Aspects of the present invention include a novel delay system, and corresponding method, for increasing the natural delay of a system utilizing filters having only one port. Aspects of the present invention also involve a delay circuit utilizing one or more circulators. Yet further aspects of the invention involve providing a reflective surface for increasing the distance traversed thereby increasing delay. In a further aspect of the invention, multiple filters may be employed by coupling those filters through one or more circulators interchangeably, thereby creating a varying number of delay combinations, and thereby varying the cumulative delay times. In a further aspect of the invention, filter resonators may be arranged in arrays and may be coupled through opening in the cavities encasing the resonators. As an additional aspect of the invention, the resonator cavities of the filter may be cross-coupled.

Abstract: A delay circuit for the secondary path of a feed-forward high power amplifier is disclosed. A first 3 dB quadrature hybrid coupler is coupled to first and second resonator circuits that are resonant at a first resonant frequency. The output of the first hybrid coupler is coupled to the input of a second 3 dB quadrature hybrid coupler. The second hybrid coupler is coupled to third and fourth resonator circuits that are resonant at a second resonant frequency that is greater than the first resonant frequency. The overall combined delay response of the first hybrid coupler and the second hybrid coupler appearing at the fourth node of the second hybrid coupler is substantially constant between the first resonant frequency and the second resonant frequency.

Abstract: A delay circuit for the secondary path of a feed-forward high power amplifier is disclosed. A first 3 dB quadrature hybrid coupler is coupled to first and second resonator circuits that each includes a varactor circuit and are resonant at a first resonant frequency. The output of the first hybrid coupler is coupled to the input of a second 3 dB quadrature hybrid coupler. The second hybrid coupler is coupled to third and fourth resonator circuits that each includes a varactor circuit and are resonant at a second resonant frequency that is greater than the first resonant frequency. The overall combined delay response of the first hybrid coupler and the second hybrid coupler appearing at the fourth node of the second hybrid coupler is substantially constant between the first resonant frequency and the second resonant frequency.

Abstract: A bandpass filter having three waveguide cavities problessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeroes on only one side a filter passband.

Abstract: A cryogenic waveguide cavity filter for use in a wireless communication systems.

Abstract: The present invention provides improved tunable filters that may provide more accurate tuning and a substantially greater tuning range as compared with conventional filters. Filters according to one or more aspects of the present invention may include improved tuning mechanisms, may include a CPU and a memory, wherein the CPU controls the tuning mechanism to tune to different frequencies responsive to a plurality of predefined filter characteristics stored in the memory. Filters according to one or more aspects of the present invention may further include two opposed ceramic pucks of approximately equal size, thereby providing a substantially larger tuning range than where the upper puck is simply a dielectric disk of a substantially different size. Further, the two opposed ceramic puck may be moved relative to each other in a non-rotational manner, thus reducing undesirable variations in the tuning of the filter.

Abstract: An enhanced tunable coaxial cavity filter that may be tuned while it is shorted. The coaxial cavity filter may have one or more cavities. One or more of the cavities may include a switch for shorting the cavity. When a plurality of cavities are implemented, the cavities may be coupled in series such that shorting one of the cavities effectively shorts the entire filter. The switch for shorting the cavity may include a solenoid switch. The solenoid switch may be disposed within a stator that is stationary with respect to a rotatable rod for tuning the filter. Such a design has shown to be extremely robust for wear, vibration, and other considerations, even in high stress environments.

Abstract: A bandpass filter having three waveguide cavities probelessly coupled in a tri-section for producing an asymmetric response about a passband. In another aspect, the bandpass filter also includes first and second waveguide tri-sections coupled in series via a common waveguide cavity, providing a bandpass waveguide filter having transmission zeroes on only one side a filter passband.