Antenna with embedded wideband matching substrate
First Claim
1. An impedance matching structure for an antenna radiator element, comprising:
- a printed circuit board (PCB) having no dedicated ground layer;
a radio frequency (RF) input coupled to a microstrip disposed on the PCB;
a diplexed matching circuit located after the microstrip comprising;
a low frequency (LF) matching circuit, formed of a low pass filter providing a low frequency path, disposed on the PCB;
a high frequency (HF) matching circuit, formed of a high pass filter providing a high frequency path, disposed on the PCB;
wherein current fed through the RF input continues through the microstrip and then splits after the microstrip into two paths into the LF and HF matching circuits;
a RF stripline embedded within a stripline ground within the PCB between the microstrip and the HF matching circuit as part of the high frequency path of the diplexed matching circuit, the embedded RF stripline providing matching and a common ground for both the HF and LF matching circuits, the matching and common ground provided by the embedded RF stripline providing a return current path for both the HF and LF matching circuits; and
an antenna feed point for coupling to the antenna radiator element, the antenna feed point disposed on the PCB at an output joining outputs of the LF matching circuit and the HF matching circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna (100) with an embedded wideband matching substrate (102) is provided. The substrate (102) comprises impedance matching circuitry (300) providing a low frequency (LF) matching circuit (330) and a high frequency (HF) matching circuit (340) for tri-band operation. A stripline (314) having a stripline ground (324) is disposed on the substrate. The stripline (314) provides a matching element and the stripline ground (324) provides a common ground (324) for both the HF and LF matching circuits. The substrate (102) is shaped with a tabular portion (106) which facilitates encasing the substrate (102) within a casing (118). The tabular portion (106) further provides an alignment feature for wrapping of a flexible radiating element about the casing and flexible antenna rod (126) to complete the antenna structure (100).
34 Citations
22 Claims
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1. An impedance matching structure for an antenna radiator element, comprising:
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a printed circuit board (PCB) having no dedicated ground layer; a radio frequency (RF) input coupled to a microstrip disposed on the PCB; a diplexed matching circuit located after the microstrip comprising; a low frequency (LF) matching circuit, formed of a low pass filter providing a low frequency path, disposed on the PCB; a high frequency (HF) matching circuit, formed of a high pass filter providing a high frequency path, disposed on the PCB; wherein current fed through the RF input continues through the microstrip and then splits after the microstrip into two paths into the LF and HF matching circuits; a RF stripline embedded within a stripline ground within the PCB between the microstrip and the HF matching circuit as part of the high frequency path of the diplexed matching circuit, the embedded RF stripline providing matching and a common ground for both the HF and LF matching circuits, the matching and common ground provided by the embedded RF stripline providing a return current path for both the HF and LF matching circuits; and an antenna feed point for coupling to the antenna radiator element, the antenna feed point disposed on the PCB at an output joining outputs of the LF matching circuit and the HF matching circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 17, 18, 21)
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9. An antenna structure for an antenna radiator element, comprising:
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a casing; a flexible rod coupled to the casing; a rolled conductive strip wrapped about the casing with overlapping successive turns; a printed circuit board (PCB) retained within the casing, the PCB having no dedicated ground layer; a radio frequency (RF) input coupled to a microstrip disposed on the PCB; a diplexed matching circuit located after the microstrip on the PCB, comprising; a low frequency (LF) matching circuit, formed of a low pass filter providing a low frequency path, disposed on the PCB; a high frequency (HF) matching circuit, formed of a high pass filter providing a high frequency path, disposed on the PCB, wherein current fed through the RF input continues through the microstrip and then splits after the microstrip into two paths into the LF and HF matching circuits; and a RF stripline coupled between the microstrip and the HF matching circuit as part of the high frequency path of the diplexed matching circuit, the embedded RF stripline having a stripline ground within the PCB providing matching and a common ground to both the LF matching circuit and the HF matching circuit, the matching and common ground provided by the embedded RF stripline providing a return current path for both the HF and LF matching circuits; and an antenna feed point for coupling to the antenna radiator element, the antenna feed point disposed on the PCB at an output joining outputs of the LF matching circuit and the HF matching circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 19, 20, 22)
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Specification