TY - JOUR
T1 - A Wideband Filtering Antenna Array with Harmonic Suppression
AU - Zhang, Yiming
AU - Zhang, Shuai
AU - Yang, Guangwei
AU - Pedersen, Gert Frølund
N1 - Best Reading Paper of the October Issue 2020 in IEEE Transactions on Microwave Theory and Techniques
PY - 2020/10
Y1 - 2020/10
N2 - In this work, a wideband 2×2 filtering antenna array is proposed and studied for fixed beam applications. The device is composed of a patch antenna array and a slotline-based four-way filtering power divider served as the feeding network. The integration of the antenna and the feeding parts is not a simple combination but a co-synthesis, where the characters of the two parts are both involved during the integration. First of all, the presented network is analyzed through an equivalent-circuit study to verify the frequency selectivity. Subsequently, integration synthesis of the network and the patch array is carried out to realize the filtering antenna array. For demonstration purposes, a filtering antenna array centered at 3 GHz is developed and fabricated. The measured absolute impedance bandwidth is 1.13 GHz, corresponding to a fractional bandwidth of 37.1%, and out-of-band rejection of up to 9.5 GHz is achieved. Compared to the array fed by a traditionally T-junction-based power divider, the absolute impedance bandwidth of the filtering array is significantly increased by 47%. The in-band gain of the proposed array is higher than 9.7 dBi, which is over 12.1 dBi from 2.75 GHz to 3.25 GHz. The results denote that compared to the previously reported literature the proposed filtering antenna array features: sharp cutoff response, wide impedance bandwidth, high gain as well as low cross-polarization level, with the harmonic suppression of up to three times the center frequency.
AB - In this work, a wideband 2×2 filtering antenna array is proposed and studied for fixed beam applications. The device is composed of a patch antenna array and a slotline-based four-way filtering power divider served as the feeding network. The integration of the antenna and the feeding parts is not a simple combination but a co-synthesis, where the characters of the two parts are both involved during the integration. First of all, the presented network is analyzed through an equivalent-circuit study to verify the frequency selectivity. Subsequently, integration synthesis of the network and the patch array is carried out to realize the filtering antenna array. For demonstration purposes, a filtering antenna array centered at 3 GHz is developed and fabricated. The measured absolute impedance bandwidth is 1.13 GHz, corresponding to a fractional bandwidth of 37.1%, and out-of-band rejection of up to 9.5 GHz is achieved. Compared to the array fed by a traditionally T-junction-based power divider, the absolute impedance bandwidth of the filtering array is significantly increased by 47%. The in-band gain of the proposed array is higher than 9.7 dBi, which is over 12.1 dBi from 2.75 GHz to 3.25 GHz. The results denote that compared to the previously reported literature the proposed filtering antenna array features: sharp cutoff response, wide impedance bandwidth, high gain as well as low cross-polarization level, with the harmonic suppression of up to three times the center frequency.
KW - Differential feeding
KW - filtering antenna array
KW - filtering power divider
KW - harmonic suppression
UR - http://www.scopus.com/inward/record.url?scp=85092475729&partnerID=8YFLogxK
U2 - 10.1109/TMTT.2020.2993307
DO - 10.1109/TMTT.2020.2993307
M3 - Journal article
SN - 0018-9480
VL - 68
SP - 4327
EP - 4339
JO - I E E E Transactions on Microwave Theory and Techniques
JF - I E E E Transactions on Microwave Theory and Techniques
IS - 10
M1 - 9102359
ER -