利用蕈狀結構實現新型三頻平板式微帶天線

Abstract

本論文以蕈狀結構結合懸置微帶線的頻率選擇短路邊界條件配合一般的平板式微帶天線創造出多重路徑以及利用蕈狀結構與平板式微帶天線之間的頻率獨立性設計出一個可以多頻操作且具有頻率可調性的新型天線。 首先從雙頻天線的設計開始，將一組工作頻率與平板式微帶天線共振率不同的蕈狀結構放置於天線的下方，利用蕈狀結構結合懸置微帶線的頻率選擇短路邊界條件創造出一個一端開路一端短路的四分之一波長共振的路徑，藉此創造出兩個獨立且具有可調性的共振頻帶。 接著延續雙頻天線的概念將兩組不同的蕈狀結構放置於平板式微帶天線下方藉以產生三個操作頻帶：兩個由蕈狀結構產生的四分之一波長共振模式，以及一個平板式微帶天線的半波長共振模式。

The thesis uses the frequency-selective via characteristic of the mushroom-liked structures beneath the microstrip transmission line combining microstrip patch antenna to manufacture multi-resonance path and use the isolation of the operation frequency between mushroom-liked structure and microstrip patch antenna designed a novel multiband and frequency tunable antenna. First, we start with dual-band antenna. Placed a mushroom-liked structure under a patch antenna, while the mushroom-liked structure has different operation frequency with patch antenna. Use the frequency-selective via property of the mushroom-liked structure beneath the microstrip transmission line to generate a quarter-wavelength resonate path, which has two high isolation and tunable operation band. Extend the concept of dual-band antenna, placed two types of mushroom-liked structure beneath the patch to produce three resonate paths: two quarter-wavelength caused by mushroom-liked structures and a half-wavelength caused by microstip patch antenna.