- Coplanar Elements
- Overview
- Coplanar Transmission Lines
- Coplanar Discontinuities
- Coplanar Lumped Elements
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The palette "Coplanar Elements" consists of three groups of elements: Coplanar Transmission Lines, Coplanar Discontinuities and Coplanar Lumped Elements.
In the Group of Coplanar Transmission lines, there are two elements: Coplanar Transmission Line (C_LIN) and Coplanar Inter Metal Via (C_METVIA). The Element C_METVIA is used for connection of different metal levels. All important effects such as finite ground planes, metallization thickness and the influence of backside metallization can be taken into account. The conductor as well as dielectric losses are considered and the line attenuation is calculated for both DC and RF cases. For these two elements a distributive equivalent circuit is used (see Table 5-1). As a results, the simulation of these elements is valid even for frequencies beyond the l/4 frequency.
| Coplanar Transmission Lines | ||
| Name | Physical | Equivalent Circuit |
| C_LIN
Coplanar Transmission Line |
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| C_METVIA
Coplanar Inter Metal Via |
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Table 5-1: Coplanar Transmission Lines in COPLAN for Libra and their equivalent circuit
The Group of Coplanar Discontinuities consists of all usual discontinuities with and without air-bridges (see Tables 5-2a and 5-2b). There are 9 Elements in this group: Coplanar Open (C_OPEN) with and without connected ground planes, Coplanar Short (C_SHORT), Coplanar Gap (C_GAP), Coplanar Step (C_STEP), Coplanar Taper (C_TAPER), Coplanar Air-Bridge (C_AIR), Coplanar Bend (C_BEND), Coplanar Tee-Junction (C_TEE) and Coplanar Cross-Junction (C_CROSS). All junctions can have arbitrary arrangement and combination of feed lines and air bridge types at ports. The equivalent circuits used for the description of electromagnetic behavior of these elements are shown in Tables 5-2a and 5-2b.
| Coplanar Discontinuities | ||
| Name | Physical | Equivalent Circuit |
| C_OPEN
Coplanar Open |
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| C_SHORT
Coplanar Short |
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| C_GAP Coplanar Gap |
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| C_STEP
Coplanar Step |
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| C_TAPER
Coplanar Taper |
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Table 5-2a: Coplanar Discontinuities in COPLAN for Libra and their equivalent circuit
| Coplanar Discontinuities (With airbridges) | ||
| Name | Physical | Equivalent Circuit |
| C_AIR Coplanar Air-Bridge |
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| C_BEND
Coplanar Bend |
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| C_TEE Coplanar Tee-Junction |
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| C_CROSS
Coplanar Cross-Junction |
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Table 5-2b: Coplanar Discontinuities (with air bridges) in COPLAN for Libra and their equivalent circuit
The group of Coplanar Lumped Elements contains the most used elements. There are 6 elements in this group: Coplanar Interdigitated Capacitor (C_IDC), Coplanar Rectangular Spiral Inductor (C_RIND), Coplanar Thin-Film Resistor as series (C_TFR) or shunt resistor (C_TFG) and Coplanar MIM-Capacitor as series (C_MIM) or shunt capacitor (C_CAPLIN). Tables 5-3a and 5-3b show the coplanar lumped elements and their equivalent circuits.
| Coplanar lumped elements | ||
| Name | Physical | Equivalent Circuit |
| C_IDC Coplanar Interdigital Capacitor |
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| C_RIND
Coplanar Rectangular Inductor |
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Table 5-3a: Coplanar Lumped Elements in COPLAN for Libra and their equivalent circuit
| Coplanar lumped elements | ||
| Name | Physical | Equivalent Circuit |
| C_MIM Coplanar MIM-Capacitor |
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| C_CAPLIN
Coplanar MIM-Capacitor to Ground |
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| C_TFR Coplanar Thinfilm Resistor |
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| C_TFG Coplanar Thinfilm Resistor to Ground |
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Table 5-3b: Coplanar Lumped Elements in COPLAN for Libra and their equivalent circuit
