CN201985230U - Miniature microwave cavity - Google Patents

Abstract

The utility model discloses a miniature microwave cavity which comprises a square metal conduction band, an isolation layer, a medium layer, a metal pad, metal through holes and an earth plate; the whole microwave cavity is symmetric with respect to a center shaft; the medium layer is arranged above the earth plate; the isolation layer is arranged above the medium layer; the square metal conduction band is printed on the isolation layer; the metal through holes are uniformly embedded in the medium layer right below the metal conduction band; and the upper part of each metal through hole is connected with the metal pad. The miniature microwave cavity is mainly applied to modern communication systems and capable of satisfying the circuit miniaturization requirements of the modern communication systems.

Description

Miniaturized Microwave Resonator

technical field

The utility model relates to a microwave passive device, which is mainly used in modern communication systems and meets the circuit miniaturization requirements of the modern communication systems.

Background technique

Microwave resonators are commonly used components in microwave systems. In the 1980s, microwave circuits such as filters, oscillators, mixers, and couplers made of ring resonators also began to appear. More recently, cellular and other mobile communication systems have also started using compact filters consisting of microstrip ring resonators. Ring circuits also exhibit excellent performance when applied to coplanar waveguide and slotline structures. Such solid-state devices can also be integrated to perform switching, amplification, and optoelectronic functions.

Resonant cavities are widely used in microwave circuits as common microwave devices, but with the development of modern communication systems, common microwave resonant cavities can no longer fully meet the urgent requirements of circuit miniaturization.

Contents of the invention

The purpose of the utility model is to provide a new type of microwave resonant cavity, which can well meet the working requirements of circuit miniaturization in modern communication systems.

The technical solution to realize the purpose of this utility model is: a miniaturized microwave resonant cavity, including a square metal conduction strip, an isolation layer, a dielectric layer, a metal pad, a metal through hole and a grounding plate; the entire microwave resonant cavity is symmetrical about the central axis , above the ground plate is the dielectric layer; above the dielectric layer is the isolation layer; the square metal conduction strip is printed on the isolation layer; in the dielectric layer directly below the metal conduction strip, the ground metal vias are evenly embedded, and each metal via is above Connect to the metal pad.

Compared with the prior art, the utility model has significant advantages: the structure of the metal patch and the through hole is equivalent to improving the position of the grounding plate, increasing the distributed capacitance of the resonator, increasing the effective dielectric constant, and reducing the Circuit size, when the resonant frequency f ₀ =2.01GHz, the circuit area of the resonant cavity of the utility model is reduced by about 43% compared with the circuit area of the common microstrip resonant cavity; at the same time, the load quality factor of the resonant cavity of the utility model is only smaller than that of the common microstrip The resonant cavity is reduced by 4.6%; the engineering realization of the new resonant cavity is also relatively simple, which can realize the miniaturization of the circuit.

Description of drawings

What Fig. 1 shows is according to the plan view that the utility model proposes.

What Fig. 2 shows is the front view proposed according to the utility model.

What Fig. 3 shows is the simulation result figure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

The structure of the utility model is respectively ground plate, artificial dielectric layer, isolation layer and metal microstrip line from bottom to top, and its structure diagram is shown in Fig. 1 and Fig. 2 . The mechanism is a square structure with left, right, up and down symmetry; metal vias of the same size are embedded in the artificial dielectric layer, and circular metal pads of equal size are connected above each metal via; these metal vias and pads are evenly distributed in the microstrip Directly below the circuit; the microstrip circuit is a uniform square microstrip coil. Since the novel resonant cavity adopts the substrate integrated artificial medium, the effective dielectric constant of the medium is improved, thereby realizing the miniaturization of the circuit.

Embodiment: Combining with Fig. 1 and Fig. 2, taking a microwave resonant cavity with a resonant frequency band of 2.01 GHz as an example, the specific implementation of the structure of the utility model will be described in detail.

With the help of the very mature microwave integrated circuit processing technology at present, the microstrip line _is produced _on the printed circuit board according to the following parameters. mm; metal through hole [5] diameter d = 0.4m, spacing p = 2mm, height equal to the height of the dielectric layer [3]; metal disc [4] diameter D = 1.2mm; dielectric layer [3] isolation layer [2 ] Using the same medium, the relative permittivity is 2.2, and the thicknesses are h ₁ =0.2mm, h ₂ =0.8mm; the grounding plate [6] is 31.61mm long. The structure of the whole microwave resonant cavity is left, right, up and down symmetrical about the central axis.

Claims (2)

1. A miniaturized microwave resonator is characterized in that: it comprises a square metal conduction band [1], an isolation layer [2], a dielectric layer [3], a metal pad [4], a metal through hole [5] and a connection Floor [6]; the entire microwave resonator is symmetrical about the central axis, and the dielectric layer [3] is above the ground plate [6]; the isolation layer [2] is above the dielectric layer [3]; the square metal conduction strip [1] is printed on On the isolation layer [2]; in the dielectric layer [3] directly below the metal conduction strip [1], evenly embed the ground metal vias [5], and each metal via [5] is connected to the metal pad [4] . 2. The miniaturized microwave resonant cavity according to claim 1, characterized in that: the structure of the entire microwave resonant cavity is symmetrical about the central axis, left and right, up and down, metal patches are embedded in the dielectric layer, and these metal patches are grounded through metal through holes .

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