Pulse antenna for communicating delay lines loaded with resistors and gradient slot line by tree access

Abstract

The invention relates to a pulse antenna for communicating delay lines loaded with resistors and a gradient slot line by tree access. The pulse antenna comprises gradient slot line radiating patches (1), medium substrates (2), a microstrip feeder line (3), tree access lines (4), communicating delay lines (5) and loaded resistors (6), wherein the loaded resistors are distributed on the communicating delay lines; the edge of a gap between two gradient slot line radiating patches is opened to form a flared opening; the largest opened positions at the tail ends of the gradient slot line radiating patches are radiating tail ends (8) of the antenna; the other end of the opening of the gap is an open end of a slot line (9); one end of the microstrip feeder line is a feed end (10), and the other end of the microstrip feeder line is a transition section (11) from a microstrip to the slot line; the tree access lines are positioned at the areas of the back surfaces of the medium substrates of the gradient slot line radiating patches; the branch of the tree access line at each area converges into a convergent point (13); the two convergent points (13) are connected by the communicating delay lines; and the tail ends of the other directions of the branches of the tree access lines are connected with the radiating tail ends (8) of the antenna by metallized via holes (14).

Description

technical field [0001] The invention relates to a pulse antenna, in particular to a tree-shaped access connected delay line resistance-loaded tapered slot line pulse antenna, which belongs to the technical field of pulse antenna manufacture. Background technique [0002] When the pulse antenna radiates a pulse signal, during the period when the pulse current flows from the antenna input terminal to the antenna end, if the pulse antenna cannot radiate all the electromagnetic energy, there will be remaining unradiated pulse current at the antenna radiation end. The remaining pulse current will return along the original path in the antenna, and continue to radiate electromagnetic energy in the process thereafter, thus forming a tailing pulse. When the pulse antenna is used in ground penetrating radar, these tailing pulses overlap with the signal from the target in the time domain, thereby causing interference to the target signal, so measures are usually taken to reduce the inf...

AI Technical Summary

Problems solved by technology

Most of the existing resistance loading is distributed loading. At this time, the resistance is located between the feed point of the antenna and the radiation end. The load resistance absorbs the remaining pulse energy at the radiation end of the antenna and also absorbs the pulse energy that could have been radiated. Therefore, the use of this resistance loading will reduce the radiation efficiency of the antenna

At the same time, the size of the radiation end of the tapered slot line pulse antenna is relatively large, and the distribution range of the terminal current is large. A small amount of resistance loading placed between the feed point and the radiation end cannot effectively absorb the remaining pulse current at the end of the antenna, thereby reducing the tailing. Limited improvement in pulse adverse effects

Moreover, when the working frequency band of the antenna is high, the size of the antenna is small, and it is difficult to set up multiple long connections

In addition, as the operating frequency decreases, the radiation capability of the antenna decreases, causing low-frequency energy to be unable to radiate effectively. However, from the perspective of the antenna feeder, the antenna is open, and the impedance of the antenna does not match. The low-frequency energy reflects out of the antenna and affects the transmission. machine work

Therefore, the traditional resistance loading cannot solve this problem, making it difficult to greatly reduce the operating frequency of the resistance-loaded antenna, and it is difficult to effectively widen the impedance bandwidth of the antenna.

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