4results about How to "Good return loss" patented technology

The application relates to the technical field of integrated circuits, and discloses an analog front-end circuit applied to a super-high-speed SerDes receiver, a transimpedance amplifier of which comprises a pair of input transistors, the gates of which are connected and connected with a T coil composed of a first inductor and a second inductor, one end of the first inductor is connected with the gate and connected in parallel with a second capacitor, the other end receives a front-stage input and is connected in parallel with one end of the second inductor and a first capacitor, the drains of the input transistors are connected and connected with a T coil composed of a fifth inductor and a sixth inductor, one end of the sixth inductor is connected with the drain and connected in parallel with a third capacitor, the other end outputs an amplified signal and is connected in parallel with one end of the fifth inductor and a fourth capacitor, and the other end of the second inductor and the other end of the fifth inductor are directly connected in series with a first resistor and a third inductor. The application optimizes zero-pole compensation high-frequency loss and optimizes impedance matching to reduce reflection, and better guarantees the integrity of signals.

The present invention relates to a composite antenna unit and an array antenna thereof. The antenna of the present invention is a three-layer structure composed of a patch antenna and a slot antenna. The first layer is a patch antenna with a resonance condition of half a wavelength, the second layer is a slot antenna with a resonance condition of half a wavelength, and the third layer is a transmission line and a feeding point position. The entire composite antenna unit is coupled to achieve a resonance condition, and a signal is fed from the transmission line to the slot antenna in a coupled form, and the slot antenna signal is coupled once more to the patch antenna. The composite array antenna has good antenna gain performance, and greatly improves the antenna bandwidth compared to a single patch antenna or a single slot antenna.

The invention discloses a small dual-frequency bandpass filter based on CSRR, which comprises a dielectric substrate, a first metal coating layer arranged on the upper surface of the dielectric substrate, a second metal coating layer arranged on the lower surface of the dielectric substrate and used as a grounding layer, and metal vias respectively arranged at four corners of the substrate; the first metal coating layer is etched with two large complementary open ring resonators CSRR and two small complementary open ring resonators CSRR; the large complementary open ring resonators CSRR and the small complementary open ring resonators CSRR are arranged alternately; the two large complementary open ring resonators CSRR and the two small complementary open ring resonators CSRR are respectively arranged diagonally on the metal coating layer; the two large complementary open ring resonators CSRR are of the same size, and the two small complementary open ring resonators CSRR are of the same size; the invention solves the problems of the existing microwave filter, such as over-large size, single frequency band, excessive insertion loss, complex structure, etc.