Slot Coupled Slot Dipole and Loop Antennas with Harmonic Suppression
Date Issued
2014
Date
2014
Author(s)
Liu, Yu-Wei
Abstract
This dissertation focuses on the development of slot dipole and slot loop antennas for harmonic suppression. As a new technique to suppress the harmonic radiation from the slot dipole and slot loop antennas, the coupling slots are introduced to the slot dipole and slot loop antennas.
In the beginning, the quarter-wave impedance and coupling technique are introduced. The quarter-wave impedance is used to transform terminations. From the coupling technique, a coupled line is used as a filter to suppress specific frequency.
CPW-fed slot dipole and loop antennas with quarter-wave impedance transformer are developed for harmonic suppression. Basing on the conventional slot dipole and loop antennas, the proposed CPW-fed slot dipole and loop antennas with quarter-wave impedance transformer are simple and easy to design. Both of the CPW-fed slot dipole and loop antennas possess a pair of coupled line section, and utilize the coupling technique to reduce the harmonic resonance. The quarter-wave impedance transformer lets a short circuit transform to an open circuit for one port of the coupled line section, and the coupled line section with a short and an open circuit works as a bandstop filter at a specific frequency. As long as designing the specific frequency at the 2nd harmonic frequency, the 2nd harmonic resonance of the slot dipole and loop antennas can be suppressed.
Next, a CPW-fed inductively coupled slot loop antenna for harmonic suppression is proposed. Because short circuit is an intuition solution for slot type antenna, the CPW-fed inductively coupled slot loop antenna utilizes the original short circuit to terminate a pair of coupled line section. Since the coupled line section with a short and an open circuits can works as a bandstop filter, it can also work as a bandstop filter with two short circuits for a specific electrical length at a specific frequency. As long as the specific frequency is designed at the higher order frequencies, that higher order harmonic resonance of the CPW-fed inductively coupled slot loop antenna can be suppressed.
Since the CPW-fed inductively coupled slot loop antenna possesses a pair of coupled line section, each one of the pair of the coupled line section can possess different electrical length. Different electrical length of the pair of coupled line section can suppress different specific frequencies. The longer electrical length of the pair of coupled line section is utilized to suppress the lower harmonic frequency, and the shorter electrical length of the pair of coupled line section is utilized to suppress the higher harmonic frequency. As long as two different specific frequencies are designed at the higher order frequencies simultaneously, two higher order harmonic resonances of the CPW-fed inductively coupled unbalanced slot loop antenna can be suppressed simultaneously.
Subjects
諧波抑制
共面波導
開槽天線
Type
thesis
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