Through improving the feeding mode,the traditional microstrip antenna with single unbalanced feed was changed into a new one with dual balanced feeds,and the RFID tag .

Delay distortion caused by log-periodic antenna can be avoided by changing its feeding method; Reflection can be greatly reduced by resistively loading antennas as cylindrical monopole antenna,conical monopole and TEM horn antenna, resulting in better characteristics in radiating pulse signal.

<Abstrcat> From the batwing antenna feed system, the paper analyzes that he batwing antenna feed can solve the impedance shift, and the principles of transformation of balance and imbalance.

The paper brings forward a new structure of feeding to improve the bandwidth of aperture-coupled microstrip antenna with the single patch.

Application of new concentrated radiation-feed network in DC system transformer substation;

On the basis of the radar production experience and manufacture practice, this paper shows that the moulding of the feed network is feasible through comparison of several methods and examination of a lot of experiments, especially for E/H dimension curved waveguide component.

A feed network design method of wind-profile radar phased array is introduced in this paper.

Improvement of feedback circuit on WSE-315 TIG welding machine;

Taking the feedback circuit especially the light feedback combining the SCM control technology,the design guarantees the steady power supply and the light output,assures the request that the xenon lamp radiates steadily.

And a precise feedback circuit based on TL431 and resistors network is devised to meet the requirements of high voltage and high precision of the power supply.