Dispersive microwave group delay line
A delay line and group delay technology, applied in delay lines, waveguide devices, electrical components, etc., can solve the problems of small delay time, increased circuit area and transmission loss, and achieve low response loss and large frequency selective delay time Effect
Active Publication Date: 2015-07-15
徐敬文 +1
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Problems solved by technology
[0003] The chromatic radiation delay line using the traditional all-pass technology will achieve a smaller group delay time, and the cascade connection (cascade connection) of the all-pass delay unit will achieve a larger group delay time. improved, but will increase the circuit area and transmission loss
Although surface acoustic wave devices are miniaturized and can provide greater delay, they are usually limited to low-frequency and narrow-bandwidth products
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[0019] The present invention provides a group delay network for tuning a specific signal frequency from a signal source to a load output terminal. The group delay device includes a main transmission path connected to the signal source and the output terminal at both ends, and the two basic units For non-equal length, parallel open-circuit stub groups (L 1b , L 1b ),(L 2b , L 2b ), and two pairs of non-equal-length, parallel complementary groove line groups, and non-equal-length parallel stub line groups are directly connected to the main transmission path 2. Among them, the electrical length θ of a pair of unequal-length stubs i (i=1,2) is different from another pair of stubs (L 2b , L 2b ). In other words, the electrical (and physical) lengths of the two stub groups are as figure 1 shown are different from each other, and θ 1 ≠θ 2 . stub group (2Z 1b ,2Z 1b ) and stub group (2Z 2b ,2Z 2b ) have different electrical lengths. Two pairs of complementary grooves of...
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A dispersive microwave group delay line at least comprises a basic unit which tunes the delay time of the signal transmission group from a signal source terminal (1) to an output load terminal (5). In the basic unit, two pairs of non equilateral residual segments ((L1b, L1b), (L2b, L2b)) are arranged at two sides of a signal layer of a main transmission path (2), and two pairs of complementation trough lines ((L1t, L1t), (L2t, L2t) are arranged at two sides of a grounding plane of a microstrip line structure of the main transmission path (2). In the microstrip line structure, the non equilateral residual segments arranged on a middle layer, and the complementation trough lines are arranged on a conductor outside the grounding plane of the microstrip line structure. A transmission path member is provided with related characteristic impedors (Zo, 2Z1b, 2Z2b, 2Z1t and 2Z2t) which are selected to control the group delay time and reduce the reflected signal from the signal source terminal (1) to the output load terminal (5). A group delay time system can be formed by means of cascade connection.
Description
technical field [0001] The invention relates to a microwave group delay line technology applied to electromagnetic signals. Background technique [0002] Group delay has always been a topic related to electromagnetic communication. The transmission channel must have a flat group delay in the pass-band. For example, in the traditional Chebyshev (Chebyshev) theorem, Butterworth (Butterworth ) or elliptic method designed band-pass filter (band-pass filter) which has a flat delay in the pass-band, but has a larger group delay near the edge of the pass-band. In conclusion, in most cases, larger group delays reflected outside the bandpass are not of particular importance. Therefore, most studies focus on the flat delay group of microwave components. However, electromagnetic communication channels will suffer from strong group delay changes in the atmosphere or other transmission channels. When pulse signals are taken into consideration, the time domain waveform will become disto...
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IPC IPC(8): H01P9/04
Inventor 徐敬文徐志弘
Owner 徐敬文