60-GHz LTCC Antenna Arrays - Ultra-Wideband and 60 GHz Communications for Biomedical Applications - page 219

Fig. 18 Geometry of the proposed dual-polarized L-probe patch array with the open-ended SICs.
a 3D view, b Side view

Overview of the Antenna Array

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A4 4 dual-polarized L-probe patch antenna array using “differential feed”

approach with the open-ended SICs is designed and implemented for 60-GHz appli-
cations. The configuration of the proposed antenna array is shown in Fig. 18 . The
proposed antenna array is composed of 16 “differential feed” L-probe antenna el-
ements, compact dual polarization SL feeding network, the open-ended SICs, and
two GCPW to SL transitions for probe station testing. The element spacing of two
adjacent patches is 3.8 mm (0.76 λ 0 ). The total size of the proposed antenna array

excluding the measurement transitions is 15.4 1.2 mm 3 . × 15.4 ×

Antenna Element Design and Investigation

Investigation of “Differential Feed” Approach for Isolation Enhancement

Figure 19 shows the geometry of the two antenna elements with different feeding
approaches. Element A, as shown in Fig. 19 a, uses the conventional “single feed”