31results about How to "Improved cross polarization ratio" patented technology

The invention relates to the field of mobile communication base station antennas, and in particular relates to an umbrella-shaped ultra-wideband bipolarization base station antenna radiation unit mounted on a reflection plate for forming an antenna. The umbrella-shaped ultra-wideband bipolarization base station antenna radiation unit comprises a plurality of support elements fixed on the reflection plate, a plurality of radiation bodies and an electricity feed cable, wherein the plurality of radiation bodies are formed through extending from the first ends of the support elements; the electricity feed cable feeds electricity for the radiation bodies; the plurality of radiation bodies form two groups of half-wave vibrators in mutual orthogonality; the corresponding connection part of the electrical connection of the electricity feed cable and the radiation bodies is lower than the upper surfaces of the radiation bodies. The difference is that each radiation body consists of a horizontal radiation body and a bent radiation body; and the tail end extending outward of each horizontal radiation body is connected with the bent radiation body bending downward. The umbrella-shaped ultra-wideband bipolarization base station antenna radiation unit provided by the invention is high in impedance band width, high in insulation degree and high in crossed polarization ratio.

The invention discloses a miniaturized wideband radiating element suitable for TD-LTE antennas. The miniaturized wideband radiating element comprises radiating bodies which are printed on the front face and the back face of a PCB dielectric slab (16) respectively, a sinking column (8) for regulating the low-frequency standing wave ratio and the cross polarization ratio, a tin-plated metal base (9) and coaxial cables (10). The radiating bodies are composed of metal sheets of double-layer structures and feed pieces which are vertically separated. On the premise of guaranteeing the bandwidth of the antennas, the overall weight and size of the antennas can be greatly reduced, and a base station can be conveniently built and maintained in later periods. Compared with a current metal die-casting radiating element, the miniaturized wideband radiating element can be more easily welded and assembled, and is better in stability.

The invention discloses a bipolar vibrator, which comprises a radiation unit and a vibrator base, wherein the vibrator base is connected with the radiation unit; the radiation unit comprises a carrier plate and two band lines; the two band lines are covered on upper and lower surfaces of the carrier plate respectively; the two band lines are shaped identically and perpendicular to each other; each of the band lines is provided with two base bands parallel to each other and two radiation bands connected to both ends of each of the two base bands symmetrically; the two base bands are connected with the vibrator base respectively and form a closed loop with the two radiation bands; the two base bands are grounded respectively; and one of the two base bands is used for feeding in a signal. The two base bands of the each band line of the bipolar vibrator form the closed loop with the two radiation bands connected to the both ends of each of the two base bands symmetrically, thereby furtherforming a polar direction; and one of the base bands is used for feeding the signal of a feed cable in the two radiation bands, thereby improving the isolation, the front-to-back ratio and the cross polarization ratio of the vibrator.

The invention discloses a high gain T-shaped probe feed millimeter wave patch antenna. The high gain T-shaped probe feed millimeter wave patch antenna comprises a first medium substrate, wherein the first medium substrate is provided with a T-shaped probe, a first radiation patch, a second radiation patch, a first coplanar waveguide transmission wire and a second coplanar waveguide transmission wire, the T-shaped probe comprises a horizontal patch and a vertical metal through hole, the horizontal patch, the first radiation patch and the second radiation patch are arranged on a front surface of the first medium substrate, distances between the horizontal patch and the first radiation patch and the second radiation patch are identical, the first coplanar waveguide transmission wire and the second coplanar waveguide transmission wire are arranged on a back surface of the first medium substrate, and the vertical metal through hole is arranged at a center of the horizontal patch and sequentially penetrates through the horizontal patch, the first medium substrate and the first coplanar waveguide transmission wire. The high gain T-shaped probe feed millimeter wave patch antenna is advantaged in that an excellent radiation directional diagram is realized, a stable and relatively high gain is realized in the whole work frequency band, and simple design, small volume, low cost and good characteristics are realized.

The invention relates to a dipole antenna with an adjustable feeding frequency and a method for adjusting an index of the antenna. The dipole antenna comprises a feeding end coaxial line, a coupling end coaxial line and oscillator arms; an inner conductors of the feeding end coaxial line and the coupling end coaxial line are connected through a wire above the oscillator arms; upper parts of outer conductors of the feeding end coaxial line and the coupling end coaxial line are respectively connected with the oscillator arms at two sides; lower ends of the outer conductors are respectively connected to the ground; and the coupling end coaxial line extends to below a ground plane. The dipole antenna is simple in structure and is realized by using the coaxial lines to feed, and the height of the antenna is adjustable. A method for adjusting the index of the dipole antenna fed by a dipole adjusts the length of the coupling end coaxial line and adjusts a center frequency of antenna resonance, is very simple and convenient to operate, and realizes a multi-frequency multiplexing function of one antenna. A front-to-rear ratio of the antenna can be adjusted through adjustment of the length of the coupling end coaxial line and the height of the antenna; and the method has very high practical value in optimization of the front-to-rear ratio of the antenna and optimization of a cross polarization ratio of the antenna in a dual polarized antenna.